# INST2019 (International Nuclear Science and Technology Conference)

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

## Effect of the Gamma Radiation Dose Rate and the High Voltage Supply from Battery for Survey Meter Calibration.

4 Feb 2019, 14:50
1h

#### Centara Grand at Central Ladprao

Chatuchak, Bangkok 10900, Thailand
Poster Instrument

### Speaker

Mr Thiti Rungseesumran (Thailand Institute of Nuclear Technology (Public Organization))

### Description

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 operating using battery. Therefore, the direct current (DC) voltage supply for each instrument is very important parameter which may affect to the accuracy and precision of the radiation measurement.
This research aims to study the effect of the DC voltage supply variation to the generation of high voltage (HV) supply and measured radiation dose rate of the Geiger-muller counter (GM) type survey meters. In order to decide the appropriate DC voltage level for each model of the survey meters, the survey meter would be calibrated on the $^{137}$Cs gamma ray radiation field and measured radiation dose rate by varied DC voltage from maximum allowance downward until the HV indicator is lower than manufacturer recommended. Three models of GM type survey meters: model 5 (manufacturer by Ludlum Measurements, Inc.), model ND-2000 (manufacturer by NDS Products Inc.) and model 5701-I (manufacturer by Thailand Institute of Nuclear Technology (TINT)) were engaged in this study. The results of this study will be discussed.

Keywords: calibration, survey meter, direct current (DC) voltage supply, high voltage supply

### Primary author

Mr Thiti Rungseesumran (Thailand Institute of Nuclear Technology (Public Organization))

### Co-authors

Ms Natthaporn Kamwang (Thailand Institute of Nuclear Technology (Public Organization)) Mr Dhanaj Saengchantr (Thailand Institute of Nuclear Technology (Public Organization)) Mr Kitisak Suwanpul (Thailand Institute of Nuclear Technology (Public Organization)) Ms Busayakorn Na Ranong (Thailand Institute of Nuclear Technology (Public Organization))

### Presentation Materials

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