# INST2019 (International Nuclear Science and Technology Conference)

4-6 February 2019
Asia/Bangkok timezone
Deadline for full paper revision: 21 May 2019.

## Estimation of External Gamma Radiation Dose Rate for Personnel and Students in the Area of Kasetsart University, Thailand

5 Feb 2019, 14:40
1h 10m

#### Centara Grand at Central Ladprao

Chatuchak, Bangkok 10900, Thailand
Poster Environment

### Speaker

Chanis Pornnumpa (Department of Applied Radiation and Isotopes, Faculty of Sciences, Kasetsart University)

### Description

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, Th-232, and U-238) from soil were collected in the 10 cm soil layer for 13 samples for investigating the natural background radiation. The gamma dose rates in air obtained were found between 0.09 µSv/h – 0.26 µSv/h with the average value was about 0.16 µSv/h. The location of minimum value was found at Kasetsart University Main Auditorium ($13^{\circ}$ 50$’$ 28.3$''$N, $100^{\circ}$ 34$’$ 31.1$''$E), and the maximum value was found at Museum and Insect Park of 60 Years Kasetsart University ($13^\circ$ 51$’$ 12.6$''$N, $100^\circ$ 34$'$ 01.9$''$E). The activity concentration of U-238, Th -232 and K-40 from soil samples were determined using a gamma spectrometry analysis system with HPGe detector, which the average specific activity was also used to evaluate the absorbed dose rates (D) and the annual effective dose (E) for general population in the area.