It has been a tradition since the late 1950’s, that nuclear science and technology was applied to environmental studies. The use of natural as well as artificial radioactive tracers has been successfully applied to reconstructing past environmental change, groundwater recharge rates, environmental pollution studies, ecotoxicology on biota. This presentation will focus on the transition of...
China fusion research has been carried out in a wide range from nuclear fusion research to basic plasma physics since1950s. The fundamental physics, plasma control, diagnostics, plasma wall interaction, fusion martials and engineering relevant has been addressed. In parallel, the thriving fusion research team including engineering and physics is formed. The successful programs like EAST and...
The success of thermonuclear fusion reactors relies on the development of materials used for confining plasma in extreme conditions (high temperature and high pressure). Tungsten is one of the material choices which are known for a very high melting point, excellent mechanical strength, and high radiation resistance. However, these properties degrade under a high-temperature operation. It was...
Hom Rangsi was a photoperiod-insensitive mutant aromatic rice which was derived from fast-neutron irradiation of KDML105. This study aims to investigate effects of N6-benzyladenine (BA) on shoot regeneration of Hom Rangsi grown in vitro. Seeds of rice were surface-sterilized and cultured on MS solid medium without hormone supplements for 2 weeks. Then, the explants were transplanted on to MS...
A genetic sexing strain (GSS) of the oriental fruit fly, Bactrocera dorsalis (Hendel), based on the pupal color have been developed in order to increase efficiency of fruit fly control by using sterile insect technique. To study the quality of GSS in comparison to the genetic-marker strain currently used in field operations both strains were reared with artificial diet at 27$^{\circ}$C and...
The mixing characteristic of a chemical reactor can be studied through the resident time distribution (RTD) of the reactor. One major application of the RTD is to perform troubleshooting for a reactor in operation. The deviations from ideal mixing condition such as presence of stagnant region, bypassing of fluids in the system, blockage or failure of the devices in the reactor can be observed...
In 2017-2018, Thai Research Reactor (TRR-1/M1) was completely renovated of the control and ventilation systems. At the present, the TRIGA Mark III 1.2 MW research reactor, while waiting for the operating license, is getting ready to resume its active operation for service and research purposes. With the maximum neutron flux in the central thimble of 10$^{13}$ n/cm$^2 \cdot$s, and many sample...
Simulated signals at the MAGIC telescope array are used to develop classification methods for signals of high energy cosmic radiation from astronomical nuclear processes. The instances consist of two classes of signals: electromagnetic shower and hadronic shower. The signals are not immediately distinguishable by visual inspection. Of the ten available features, none can to be used as a single...
The study is aiming at performing a review and safety assessment of Thailand's research reactor, TRR-1/M1, TRIGA Mark-III in order to determine if it is justifiable to grant an operating license for the operator by comparing experimental data with results obtained from calculations as presented in Safety Analysis Report, SAR where the maximum reactivity insertion is 4.50. Modeling, analysing...
Photostimulated luminescence (PSL) and thermoluminescence (TL) are proven methods used for detection of irradiated foods containing minerals adopted by the European Committee for Standardization (CEN) and the Codex Alimentarius Commission. However, the mineral composition in foods strongly affects the luminescence intensity which might result in the correctness of irradiation identification....
The corrosion under insulation (CUI) is the common problem that can be found in the production pipelines of petroleum and petrochemical plants. The reason of occurrence could be from the accumulation of liquid such as rain or even the condensation of product inside the pipelines. This research aims to determine location and to approximate the volume of liquid accumulated though the true scale...
A functional adsorbent with specific selectivity for heavy metals was prepared by radiation-induced grafting polymerization of bis [2-(methacryloyloxy) ethyl] phosphate (BMEP) onto polyethylene/poly propylene (PP-PE) non-woven fabric. Effects of monomer, solvent and radiation dose on degree of grafting were investigated. FTIR and SEM were used to characterize the prepared adsorbents as well as...
This study aims to develop the portable x-ray fluorescence spectrometry (pXRF) for quantitative analysis of major and minor elements in the geological samples. Eight geological certified reference materials (BCR-2: basalt, COQ-1: carbonatite, GSP-2: granodiorite, JA-1: andesite, JB-2: basalt, JG-1a: granodiorite, JG-2: granite and JSy-1: Syenite) were used to calibrate the analytical method....
Gamma radiation was used to prepare a natural polymer-based adsorbent via radiation-induced grafting polymerization of acrylic acid (AA) onto carboxymethyl cellulose (CMC). Optimization of the grafting process was done by varying a number of parameters from radiation dose to amount of AA and CMC. Characterization by Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis...
Gamma radiation has been widely applied in agriculture for crop improvement, however, it can induce oxidative stress in plants cell. This research aims to study effects of acute and chronic gamma irradiation on lipid peroxidation and plant development in M1V1 generation of turmeric. Plantlets cultured on MS medium were exposed to acute gamma radiation from Cs-137 (dose rate 3.7 Gy/min) at 0,...
The radiation survey meter is a necessary equipment for the radiation operator to determine the quantities of the ambient dose equivalent, H*(d) in the radiation workplace. In order to preserve the reliability and performance, those instruments should be maintained and calibrated periodically. There are many commercial brands of radiological survey meters and dosimetry devices that are...
A comparative study between before and after gamma ray irradiation on elastic and structural properties for (90-x)RWG – 10Na$_2$O – xZnO glass systems where RWG is recycled window glass and x is 0, 0.001, 0.01, 0.1, and 1.0 mol%, was carried out. The glass samples were prepared by melt quenching method at 1250 ℃. Densities of the prepared glass were measured based on Archimedes’ principle with...
Eggshell powders (ESP), which contain high percentage of CaCO$_3$, could be used as an effective and environmental-friendly bio-filler in gamma vulcanized natural rubber latex (GVNRL) in order to improve overall mechanical and electrical resistivity properties of the composites. This work investigated effects of adding ESP to GVNRL composites by measuring tensile properties, hardness (Shore...
$\textit{Agaricus bisporus}$ is easily perishable and subject to microbial contamination. The present study aspires to follow antioxidant activities and chemical changes of $\textit{Agaricus bisporus}$ after being exposed to gamma radiation. Powder samples were irradiated at 2.5, 5, 7.5 and 10 kGy. Subsequently, antioxidant activities, total protein content and total soluble polysaccharide...
The aim of this research is to investigate effects of gamma irradiation on antioxidant properties and microbial contaminants in Boletus griseipureus. Samples were ground into powder and later subject to gamma irradiation at 2.5, 5, 7.5 and 10 kGy. The non-irradiated and irradiated samples were then analyzed for their microbial contamination and antioxidant properties such as...
This study aims to investigate effects of gamma radiation on antimicrobial activities (against Staphylococcus aureus and Escherichia coli) and antioxidant activities of Coscinium fenestratum (Goetgh.) Colebr., known in Thai as Haem herb. Gamma irradiation was applied to powder samples of Haem herb at 5, 10, 15 and 20 kGy. The 60% ethanolic extracts of irradiated and non-irradiated...
Inductively coupled plasma optical emission spectrometry (ICP-OES) was used to determine rare earth elements, uranium and thorium in granitic soils and rock samples collected from Chumporn and Surat Thani provinces, the southern part of Thailand. The effect of digestion temperature (125$^{\circ}$C, 160$^{\circ}$C, 200$^{\circ}$C and 240$^{\circ}$C) on the concentration levels of elements was...
The toroidal rotation model based on the intrinsic torque from Neoclassical Toroidal Viscosity (NTV) theory is implemented in TASK/TR code and used together with a combination of a gyro-Landau-fluid (GLF) transport model and NCLASS neoclassical transport model to predict the evolution of plasma profiles and, consequently, the fusion performance during the injection of high-field-sided (HFS)...
SLRI Beam Test Facility (SLRI-BTF) has been constructed in order to increase usage of the Siam Photon Source injector. SLRI-BTF aims to provide electron test beams for calibration and testing of high-energy particle detectors and diagnostic instrumentations. The test-beam energy varies from 40 MeV to 1.2 GeV with adjustable intensity from a few to several millions of electrons per repetition...
Thai Hom Mali rice is an economic crop of Thailand and well-known as a premium rice in the world trade. In this research, Thai Hom Mali rice samples were collected from the paddy fields in the northern and northeastern regions of Thailand for verifying the authenticity of rice origin. Multi-element and stable isotopic compositions in rice samples were determined by inductively coupled plasma...
Graphene is known to be one of the strongest materials with excellent heat and electricity conductivity that can be used in various applications including solar cells, LED production, and electrical devices. This work aimed to investigate on possible green and environmental-friendly synthesis of reduced graphene oxide (rGO) that can be used as a basis for graphene production using gamma...
Gamma irradiation is well known as a safe method for food decontamination, due to its great effect for inactivating microorganisms in various foods. In this study, effects of gamma radiation on microbial load and antioxidant properties of dried lotus pollen were investigated. Samples were subject to gamma irradiation at 5 and 10 kGy. Results showed that initial load of total plate count (TPC)...
Glasses of system 90RWG – 10Na$_2$O – x Cr$_2$O$_3$ (RWG stands for recycled window glass and x = 0.001, 0.01, 0.1, 1 mol %) have been prepared by the melt-quenching method. The Archimedes principle was used to measure density of the glass samples, and then these data were used to calculate the molar volumes. Ultrasonic velocities were measured by using the ultrasonic contact technique at 4...
Extracts of Thai medicinal plants have been reported to be natural sources of antioxidants which can inhibit free radicals and have potential for radiation protection. In this study, we investigated the efficacy of five medicinal plant extracts, cinnamon, ginger, white kwao krua, black pepper, and moringa compared to gallic acid, which served as a positive control in the protection of plasmid...
This study focused on major element analysis of the geological samples by portable x-ray fluorescence spectrometer (pXRF) and the characterization of those samples by x-ray diffractometer (XRD) and scanning electron microscopy with energy dispersive x-ray spectroscopy (SEM/EDX). Ten samples from Phuket province, Thailand were collected with different depths corresponding to O horizon (0-0.3...
Method validation is a key part for radionuclide measurement in biological sample. To confirm that the method used is suitable for the application, this study was designed to validate a H$^{3}$ determination in urine sample using liquid scintillation counting technique. Urine samples obtained from PROCORAD were prepared by mixing 1 ml of urine, 10 ml of Ultima gold cocktail and 4 ml of water;...
This paper proposes the preliminary study of inspection method which can be applied to the internal structure inspection of distillation column in petroleum and petrochemical plants. The study was done through simulation using Monte Carlo for N-Particle (MCNP) Transport Computer Code to simulate the gamma ray transmission for Computed Tomography (CT) algorithm. The simulation results were used...
The aim of this study is to create a database of radioactivity concentration and annual effective dose of the naturally occurring radionuclides: $^{226}$Ra, $^{228}$Ra, $^{40}$K and $^{210}$Po in Thai medicinal herb plants. 99 types of popular Thai medicinal herb plants (total of 212 samples) such as $\textit{Curcuma comosa}$ Roxb., mucuna, white kwao krua, barbed grass, black galingale,...
Thailand Institute of Nuclear Technology (TINT) plan to operate the refurbished HT-6M tokamak near 2020. Although, the tokamak is old, small and low in power, it is still useful for the plasma and fusion education. With regards to researching, there are still rooms for frontier researches crucial for efficient fusion operations. One of them is the phenomena related to dust and droplet...
The production of tritium from a lithium blanket with a vanadium alloy structure was predicted using the MCNP. The model was designed to include a lithium breeder, reflector, shielding and structure. Different forms of lithium, including natural lithium, FLiBe and LiPb, were considered. LiPb had the highest tritium production per source neutron among the three forms of lithium considered. In...
In the past few years, neutron tomography in Thailand was recently established at Thai Research Reactor TRR-1/M1, Thailand Institute of Nuclear Technology (Public Organization) for research and service, as the technique is useful for non-destructive internal structure investigation. During the establishment phase, many types of specimens were tested. In this work, a standard specimen was used...
As Thailand has been preparing to operate a small tokamak in which the device will be upgraded from HT-6M tokamak, the quantitative information about the plasma in the edge and at the material surface would be insightful for future experimental operations. In this work, we use a simple two-point model to investigate the particle and heat exhausted from the core to the limiter for the tokamak...
The aim of this research is to evaluate the measurement uncertainty for personal dosimetry using NanoDot Optically Stimulated Luminescence (OSL) of the Office of Atoms for Peace (OAP). The nanoDot dosimeter which uses for medical dosimeter was selected and irradiated of absorbed dose in free air at 5 mSv of Cs-137 at Secondary Standard Dosimetry Laboratory of OAP. The measurement uncertainty...
Electron beam irradiation was applied on the quality enhancement of topaz originated from Yen Bai province in northern Vietnam. The process of enhancement was carefully taken by consideration on the optimization of power and energy of electron, efficient cooling system, annealing process and radioactivity occurring and remaining. The two of topaz sample were irradiated by 20 MeV electron beam ...
Sr-90 is considered as a hazardous radiounclide for humans. When it is consumed, it would be eventually accumulated in bone and its daughter, $^{90}$Y, could then harm bone marrow. To monitor $^{90}$Sr in the environment especially in marine food samples it is very important for Thailand as the consumtion of marine animals is high and these animals are also exported all over the world and...
Modern plant breeding is classified into three types of breeding; conventional, mutation and transgenic. In one way, mutation breeding serves as a global focal point for nuclear cooperation, mobilizing peaceful applications of nuclear science and technology for critical needs in developing countries, including Thailand. The main objective of mutation breeding in Thailand is to identify high...
Japanese hijiki, one of the most common edible seaweeds, is known to contain both AS(III) and AS(V) in inorganic forms as well as bound to organic molecules. It is of interest to develop methods for the determination of total and inorganic arsenic species in hijiki. In this work, raw and cooked hijiki samples were analyzed by instrumental neutron activation analysis (INAA). Samples were...
Radioactive tracer in plant commonly uses X-ray films or imaging plate for study nutrient distribution, which cause radioactive waste. We developed a real-time imaging system for radiotracer in sapling to reduced samples and radioactive waste. The main components of the developed system consist of the radiation detector, mechanical part, and the control software. We used 4x4 pixels of Silicon...
Increasingly, social media has been used as a platform for providing timely crisis communication during a disaster. Unfortunately, rumor spreading, and in particular, rumors that are later proven to be untrue, have been identified as critical issues for the use of social media during disasters. Few research has studied the users’ behavior when facing rumors and debunking information. In this...
Small-angle neutron scattering (SANS) and neutron reflection (NR) have become invaluable tools to life sciences researchers as they allow for determining size, shape and interactions on the nanometer scale in a variety of multi-component systems. Neutrons have specific advantages over X-rays and light. They have a high penetrating power, they are non-destructive, they have a magnetic moment...
Research based neutron sources offer a number of opportunities to study problems ranging from fundamental physics to application in the industry and everything in between. In this talk I will be covering the later part of this range focusing on problems of the industrial nature and some examples of materials research. Starting from general introduction of how a neutron source operates, I will...
The TRIGA Mark II Reactor of the Atominstitut Vienna went critical for the first time at 7.3.1962. Within the framework of the “global threat reduction initiative (GTRI)”, all fuel elements (several of them high enriched) were shipped back to Idaho Falls, US in 2012. In return, slightly used and low enriched fuel elements were delivered from US to the Institute. Subsequently, between 2015 and...
Unit 1 of Kori nuclear power plant, which had been operated for 40 years in Korea, was permanently shut down on June 2017. After its closing and decommissioning, it is important to determine its site-specific cleanup guidance levels. The most commonly used evaluation for determining the site release condition is RESRAD code developed by Argonne National Laboratory. But, the input values in...
Nuclear Malaysia is hosting the only one 1 MW thermal research reactor after being critical in 28 June 1982. Since then, many works have been done in utilizing this reactor for various type of applications. These are including Neutron Activation Analysis (NAA), Small Angle Neutron Scattering (SANS), Neutron radiography and Imaging (NURI), Production of some radio-pharmaceutical and...
Fission product behavior assessment in containment vessel is one of the important areas in safety assessments because the containment vessel is the final release protection. Modified ART Mod 2 code is used to study aerosol deposition phenomena in the containment vessel. From Phébus FPT experiments, there are occurrences of diffusiophoresis and thermophoresis on condensers in the containment...
Structural failure is a critical phenomena in construction industry. Failure occur due to the presence of residual stress combined with service stress that over the safety limit. Residual stress is the stress that exists within a material without application of an external load. There are few method for determination of residual stress. In order to study the potential failure consistently,...
In the present research, the main objectives were to measure and analyze the specific activities of natural ($^{40}$K, $^{226}$Ra and $^{232}$Th) radionuclides in 30 beach sand samples collected from Ao Phrao after the Rayong oil spill disaster. This huge Petroleum Authority of Thailand (PTT) oil spill occurred on July 27, 2013, in the Gulf of Thailand nearby Ao Phrao at Koh Samet in Rayong...
Be-7 (T$_{1/2}$ = 53.3 d) is a natural cosmogenic radionuclide and it is widely used as a natural radiotracer in many environment processes, such as atmospheric and local cycling paths of transport. Thus the purpose of this study is to examine and explain the factors that cause variation of Be-7 concentration in the area and during a period of time of the study. Weekly airborne dust samples...
Further developments of Neutron Activation Analysis (NAA) have recently been conducted in the Dalat research reactor (DRR) of Vietnam. Besides the single irradiation on the research reactor it is to be the cyclic irradiation mode; Besides the use of total neutron spectrum it is to be the epithermal neutrons; The measurement of prompt gamma-rays (PGNAA) is to be used besides the delay...
A new car-borne gamma radiation survey and data management system has been developed in order to enable a wide-area and quick survey of gamma radiation level in an environment. The data on gamma radiation level can be used to create an area mapping of baseline gamma exposure which is useful for identifying irregular spots that may appear in the area. These spots may be the consequences of an...
In the past few years, magnetic spins in the non-magnetic compounds have been studied intensively to reveal the origin of so-called room-temperature ferromagnetism in any nanoparticles. The materials having partially filled d or f shells exhibit various kinds of magnetic properties, especially ferromagnetic properties. It is known that the properties of ferromagnetism and its superconductivity...
H-3 (Tritium: Half life = 12.3 a) is a naturally common radioisotope of hydrogen containing 2 neutrons and 1 proton, produced by interaction between fast neutron and nitrogen in atmosphere. Tritium can replace a hydrogen atom in the water molecule since oxygen atom can react with tritium atom to form a water molecule instead of hydrogen atom. This study aims to measure the tritium activity...
Escherichia coli (E. coli) are gram-negative bacteria commonly found in human guts but which can cause food poisoning or severe systemic infections such as meningitis. Unlike other bacteria, gram negative cells have an additional asymmetric outer membrane (OM) which consists of outer membraneproteins and tightly-packed lipopolysaccharides (LPS) in the outer leaflet of membrane and...
Concentrations of many elements in natural waters are generally below the detection limits of most instrumental analytical techniques thereby necessitating their preconcentration. Liquid-liquid extraction has been widely used for this purpose. Nonionic type surfactants offer the best alternative to conventional extraction methods. These surfactants have a critical point (a.k.a. cloud point)...
External beam radiation therapy (known as radiation therapy) is a local cancer treatment that uses high radiation dose to damage the deoxyribonucleic acid (DNA) of cancer cells with specific part of patient body. A linear accelerator (linac) customizes high energy x-rays or electrons to conform to a tumor’s shape and destroy cancer cells while sparing surrounding normal tissue. Beam’s eye view...
This research is aimed to introduce and to compare 3 methods of reading out and analysing light blue radiochromic film (BLF) dosimeter and red radiation-sensitive poly-methylmethacrylate (PMMA). BLF and red radiation-sensitive PMMA act as a colour detector which its colour changes after being irradiated. These dosimeters are usually used in food irradiation for process control during...
The goal of radiotherapy is to eradicate tumors while sparing healthy tissues from radiation damage. Therefore, accurate definition of tumor and organ boundaries is important for achieving good treatment outcome. Organ segmentation is a standard procedure done in radiation therapy treatment planning. Computed tomography (CT) images are commonly used for this purpose. In this paper, we present...
This work presents the evaluation of geometry correction factors as functions of distances from the source and the dimensions of different moderators for a cylindrical nested neutron spectrometer (CNNS) system with a $^6$LiI(Eu) thermal neutron detector located at the moderator centers. The ISO 8529-2 only mentions these correction factors for a spherical neutron spectrometer (i.e., Bonner...
Glioblastoma (GBM) is the most aggressive and common primary brain tumors.This results in resistance to current treatment by low linear energy transfer (LET radiation such as X ray. In addition, many side effect of cisplatin are major drawbacks in radiation therapy of GBM patients. Hence, the aim of the study was to investigate the toxicity of combined high linear energy transfer (LET) carbon...
Ubiquicidin is a cationic, antimicrobial peptide found in the innate host defense against pathogens. The peptide is selectively interacted with the surface of microorganism. This work aimed to develop the radiopharmaceutical for infection imaging using antimicrobial peptide. Optimum labeling condition to obtain $^{68}$Ga-DOTA-ubiquicidin (29-41) with radiochemical purity (RCP) more than 90%...
The radiological hazards from natural radionuclides in soil at the border area between the southeast of Thailand and Laos were studied and evaluated. The 33 surface soil samples from Khong Chiam and Sirinthon districts in Ubon Ratchathani province were collected and measured the specific radioactivity of $^{226}$Ra, $^{232}$Th and $^{40}$K. The radioactivity of all soil samples was analyzed...
The high energy photon from medical linear accelerator (Linac) have been widely used for cancer treatment with radiotherapy. However, when high energy photon interact with Linac head components the undesirable neutrons contamination can be produced by photo-nuclear reaction. This work aims to evaluate photo-neutron dose generated from Linac 10 MV. The polycarbonate base layer of compact disc...
To systematically confirm safe operation of the Thai Research Reactor-1/Modification 1 (TRR-1/M1), Probabilistic Safety Assessment (PSA) can be used to quantify risks of the reactor, design protective and mitigative strategies. In the 2015 Annual Meeting of Regional Advisory Safety Committee for Research Reactors in Asia and the Pacific (RASCAP), the IAEA recommended the Member States to start...
The objective of this paper is to create networks of measuring and assessing internal dose due to intake iodine-131 using either thyroid uptake counter or gamma camera, which is currently mostly used in nuclear medicine facilities. There are thirteen nuclear medicine volunteers participated in the activity. Among the network, thyroid uptake counter technique was used by twelve representatives...
HM-20S self-shielded medical cyclotron is used in PET radiopharmaceutical production. During operation, neutrons were generated by (p,n) reaction between primary beam and target or cyclotron’s part. High energy neutrons can penetrate or slow down and activate cyclotron’s component to be radionuclide. The dose from activated radionuclide will cause radiation exposure to cyclotron operators,...
The aim of this research is to develop the method to measure the absorbed dose for radiotherapy level in the range of 1-10 Gy using EPR dosimeter. The parameters for measuring the absorbed dose using EPR dosimeter consist of microwave power, modulation amplitude, ratio of time constant: conversion time and number of scans have been used in this study. The results showed that the optimal...
Sangyod Muang Phatthalung Rice is a traditional rice variety grown in the area of Phatthalung province for more than a hundred years. Sangyod rice is the first rice variety of Thailand that has been registered as Geographical Indication (GI). It is also good rice for anyone who is searching for good health. The concentrations of elements (Mg, Al, Cl, As, Br, K, Mn, Rb and Zn) in Sangyod rice,...
Radionuclides in the environment are from natural occurrence and man-made activities. For the later source, it can be from nuclear weapon testing, nuclear accidents and nuclear applications using as in medical, industrial sectors and research that are able to increase some artificial radionuclides to the terrestrial ecosystem. These radionuclides can enter to human by inhalation, ingestion and...
Kasetsart University, Bang khen is surrounded by several radiation agencies. In order to reduce concerns and confirm on radiation safety for university personnel and students, 130 points of the ambient gamma dose equivalent rate (H*(10)) were measured above the ground at 1 m and mapping around this area using a NaI(Tl) scintillator, 63×63 mm, including natural radioactive elements (K-40,...
The safety assessment was carried out for ionization chamber smoke detectors (ICSDs) containing 241Am under normal use and accident scenarios. The internal and external dose were estimated using dose coefficients and associated calculation. In normal use of the ICSDs with the activity in a range of 0.002–1 MBq per ICSD, the external dose was evaluated by to an individual for installation, use...
Curcumin, a naturally derived substance from turmeric, is a well-known topical wound healing agent, which exhibits various properties such as anti-inflammatory, anti-oxidant, and antimicrobial. In this work, we tested the efficacy of crude curcumin prepared from turmeric powder for its wound healing effect in rats. The as-received, commercial Thai turmeric powder was first dissolved in...
The fundamental advantage in using Monte Carlo methods for burnup calculations is to formulate an effective optimal fuel management strategy for the TRR-1/M1 research reactor. The core management study has been performed by utilizing the essentially parameters including multiplication factor, power peaking, neutron flux and burnup calculation based on the Monte Carlo calculation. The fuel...
Radioactive sources have various utilization in many fields in Thailand including medical, industrial, research and education. Thailand regulatory body, Office of Atoms for Peace (OAP) has been regulating the imports and exports of radioactive sources under the Atomic Energy for Peace Act, B.E. 2504 (1961) and Nuclear Energy for Peace Act, B.E. 2559 (2016) through the licensing process and...
The purpose of this research was to measure indoor radon concentration in the area of Ban Pang Faen, Pa-Miang subdistrict, Doi-Saket district, Chiang Mai Province. Radon measurements were performed in 59 sites from February 27 to June 24, 2017 for 115 days by using plastic alpha track detectors or CR-39. The results of indoor radon gas concentrations in bedroom and living room were 28±14 to...
The fuel burnup is a key factor influencing the energy production of a nuclear power plant. In order to improve the economic efficiency of a power plant, increase of fuel burnup is needed. The change of oxide fuel thermo-mechanical properties during irradiation is well known and could be accurately simulated if a fuel burnup does not exceed the value 65 GWd/MTU. Otherwise, high burnup...
Thailand research reactor, TRR-1/M1, is a TRIGA Mark-III nuclear research reactor using UZrH fuels with 20% U-235 enrichment. The reactor operated approximately at 1,200 kWth, which produced neutrons maximum flux of 8x10$^{13}$ neutrons-cm$^{2}$ per second and maximum temperature of 600$^{\circ}$C at the hottest spot in the core. Exposure to such high neutron flux and temperature can cause...
This study focused on the long-term cycling of radiocaesium in pine forests at Wat Chan in northern Thailand. Systematic studies were made of stable and radiocaesium, potassium and rubidium in soil horizons, tree stems and needles. Measurements of total concentrations were complemented with determinations of exchangeable fractions as well as the isotopic exchangeability of radio- and stable...
In recent years, increasing attention has been paid to the effects of low-dose radiation (LDR). Evaluation of mitochondrial DNA damage and mitochondrial dysfunction can be used to assess the biological effect of LDR. This study aims to investigate the mitochondrial DNA damage induced by LDR, and its relationship with reactive oxygen species (ROS) formation after exposure to LDR. Human...
Radiation protection in exposure to natural sources has been evolving for decades. In the last two decades, developments concerning exposure to NORM (naturally occurring radioactive materials) have resulted in progress towards achieving broad international consensus on managing exposure to NORM. However, the standards and regulatory approaches being adopted at the national level still need to...
In the present work, an inductively coupled plasma mass spectrometer operating in single quadrupole was performed for determination of some rare-earth elements including La, Sm, Eu, Tl, and U in rice. The samples were prepared by microwave digestion with nitric acid. The fortifications of rice samples at 3 levels were studied in order to check the accuracy of the proposed method. The...
In this study, a prototype of commercialized-style radiation shielding blocks based on natural rubber mixed with radiation shielding substance (i.e. lead and tungsten compound) was developed. It was found that the mechanical properties of these radiation shielding blocks (including hardness, tensile strength and elongation) were reduced with increasing of the amount of radiation shielding...
Reduced graphene oxides (rGOs) provide an ideal playground to raise magnetism of intrinsically nonmagnetic graphene because of the existence of significant defects and functional groups on their layers. We have proposed a green synthesis method in preparing rGO from coconut shells as an effort to produce sufficient quantities of graphene to desired quality levels. The rGO has been synthesized...
To manage nuclear and radiation databases and also to enhance the nuclear and radiation safety regulation in Thailand, Nuclear and Radiological Facility Location Management System (NRFLMS) has been launched by the Office of Atoms for Peace (OAP) and Geo-Informatics and Space Technology Development Agency (GISTDA) since January 2017. The system consists of two main parts: Geographic Coordinates...
The production of short-lived radioisotopes using neutron activation technique that employs (n, $\gamma$) reaction has been carried out at the 1MW PUSPATI TRIGA Reactor (RTP) with the thermal neutron flux $\sim 5 \times 10^{12}$ n cm$^2$s$^{-1}$. Several in-core locations are available to produce the radioisotopes for various medical and industrial applications such as Sm-153, Br-82, Au-198...
The purpose of this study was to determine the radon concentration in water for consumption from Ban Pongkum region, Doi Saket district, Chiang Mai Province. All samples were collected from 9 sites including 7 well water samples, 1 tap water and 1 hot spring (spa pool). Radon concentration was measured with using RAD7 H2O. The results showed that the average of radon concentrations were...
Roi Et is one of the provinces with rice farming and exported to many countries around the world. In order to assess the radiation risk index from Jasmine rice cultivated soils, 175 samples in Roi Et province were measured using the gamma ray spectrometry technique for estimating the natural radioactivity levels. The specific activity of Ra-226, Th-232 and K-40 was found from 7.14 to 29.02...
Development of new and better neutron-shielding materials has become one of the most important issues in the requirements of radiation safety. In order to obtain estimated performances of the materials before actual production, simulations of neutron-shielding characteristics using well-proved methods are necessary. In this work, a Monte Carlo code of Particle and Heavy Ion Transport code...
The preparation of Fe$_3$O$_4$/MWCNT/ZnO nanocomposites was conducted by precipitation method. The nanocomposites were characterized by XRD resulting in two phases, i.e., magnetite and zinc oxide with spinel cubic and zinc hexagonal wurtzite structures. The FTIR characterization shows the functional group of C = C indicating the presence of MWCNT, Fe-O as characteristic of magnetite and Zn-O...
Office of Atoms for Peace (OAP), as the national regulatory body of Thailand, has initiated project on “Biological Effects of Ionizing Radiation in Public and Occupational Staff in Northern and Northeastern of Thailand. The objectives of the 5 years project are (1) to have completed database of radioactive materials and radioactive sources in Thailand (2) to validate method for measurement of...
Accurate assessment of the radiation absorbed dose delivered to a tumor and different organs is potentially importance issue in clinical radiotherapy. The aim of this study is to evaluate the effectiveness of the Fricke xylenol gel dosimeter (FXG) to photon radiation. With this aim, the dose response of FXG and its behavior have been investigated. The sensitivity and accuracy of FXG were...
Neutron energy spectrum measurement of four different shielding materials namely water, baryte colemanite, lead and paraffin were done using Radial Piercing Beamport at reactor TRIGA PUSPATI (RTP) in Malaysian Nuclear Agency. This beamport is installed with highly oriented pyrolytic graphite (HOPG) mosaic crystals as monocromator. The neutron energy of thermal neutron, fast neutron and gamma...
This study aimed to use OSL dosimeter to measure the radiation dose and dose distribution from CT scan. OSL nanoDot® were placed on eyes, thyroids, breasts and lower abdomen of Rando phantom to measure the equivalent dose. OSL InLight® were attached to the column placed around the CT couch to measure the radiation distribution. The results showed that lower abdomen received the highest...
Once the ionizing radiation is used, routinely survey of radiation dose in the surrounding areas must be performed to ensure radiation safety. This study aimed to measure the radiation doses in the controlled and supervised areas from fluoroscopic room using environmental InLight® optically stimulated luminescent dosimeter (OSLD). The OSLDs were attached at 1.4 m height to the wall, door, and...
The Mn$_{0.25}$Fe$_{2.75}$O$_4$@PANI particles have been successfully synthesized using in-situ polymerization method from iron sand. The characterizations were done using XRD, FTIR, VSM, TEM, VSM, and magneto-hyperthermia. The X-ray diffraction pattern showed that the Mn$_{0.25}$Fe$_{2.75}$O$_4$@PANI particles have a crystal size of 8.09 nm. The characterization results using VSM...
The intercomparison programme for the national standard dosimetry laboratory should be initiated to support the activities for assuring the quality of measurement and to harmonize the standards for ionizing radiation metrology among the Asia-Pacific region. The accurate dose measurement, especially in developing countries, requires the adequate calibration facilities and quality assurance...
Many reports presented the conversion coefficients from air kerma to Hp(3) especially for photons but rare information with dose conversion coefficients for beta radiation. The dose equivalent quantities for assessment of the eye lens dose for photons and beta radiation must be considered separately depended upon with penetrating radiation and low penetration depth. Recently, Behrens...
The influence of atmospheric non-thermal plasma on household wastewater is presented in this paper. A dielectric barrier discharge (DBD) plasma generator was designed for wastewater treatment. The DBD model was in vertical coaxial tube shape. 10-cm-diameter outer aluminum tube, bonded with 40 aluminum needles on the inner surface of the tube, was an anode, while the inner aluminum tube acting...
RUSATOM HEALTHCARE JSC (RHC) is responsible for development and promotion of advanced and innovative radiation technologies for industrial, medical and research applications within the State Corporation ROSATOM, Russian Federation. RHC’s major technologies include full-scale research, development and production of reactor and cyclotron radionuclides, full-cycle radiopharmaceutical production...
The purpose of this study was to investigate error detection sensitivity for three patient-specific VMAT QA systems (Delta4, EPID-based dosimetry, and Log file). Ten VMAT plans were randomly selected to perform error detection sensitivities. Artificial complex errors were introduced to the original plans then repeated the QA tests. These errors were simulated into three possible scenarios:...
This work concentrated on the effect of nuclear equation of state on the elliptic flow in heavy ion collision by using quantum molecular dynamics model (QMD). The elliptic flow of proton in $^{197}Au + ^{197}Au$ reaction at incident energy 0.25A GeV within the quantum molecular dynamics model was studied. The elliptic flow of proton ($v_{2}$) as a function of the centrality rapidity ($y_{0}$)...
The purpose of this study was to develop electronics portal imaging device (EPID)-based dosimetry for flattening-filter-free (FFF) beam verification. All radiation measurements were performed with source to imager distances (SID) of 150 cm to reduce saturation effect. EPID images were converted to radiation absorbed dose in water at depth of 10 cm with our algorithm included three parameters...
We analyze the yield of charged particles (${K^ + },{K^ - },p$ and ${\bar p}$) in $pp$ collisions at 7 TeV by using the PACIAE model and comparing with experimental data from ALICE. The prediction of ${K^ - }p$ and ${K^ + }\bar p$ bound states in $pp$ collisions at 7 TeV is calculated by using PACIAE+DCPC model. Using a realistic invariant mass of 1.405 GeV, we are predict the yields per event...
Hard spectrum boiling water reactor could serve as near-term alternative to sodium fast reactors for the application of transuranic waste incineration. To accurately analyze the fuel rod behavior of this reactor, modification of existing LWR fuel performance code is necessary because of significant deviation from typical operating condition of light water reactors. In this work, the physical...
We presented a method for the colorimetric assessment of cubic-shaped gemstones based on a fully controlled environment easily reproducible and its application to different specimens of quartz and topaz. The data regarding the color modification effect of E-beam irradiation and heating treatments in those minerals was described in the CIE L∗a∗b∗ perceptual color space. A general statistical...
Neutron beams can be used in a variety of research fields, and it is a very useful tool for studying cultural heritages that Non-invasive testing is essential. Cultural heritage is an important key to the study of ancient manufacturing techniques and their function. Among the many non-destructive tests, X-ray technology has come to be widely used for studies on the majority of archaeological...
Zinc injection has been widely applied for corrosion resistance of nuclear materials. The mechanism of the corrosion resistance, however, has not been completely understood. The protocol improvement is not possible without such information. In the present research, the effects of zinc on corrosion of SS 304 induced by H$_2$O$_2$ were studied at ambient pressure and temperatures up to 80$^o$C...
