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| Development of a portable device for monitoring thyroid radiation in emergency |
| ZHONG Huaqiang1,2, LUO Zhiping1, LIU Senlin1, ZHANG Ruihuan2, WANG Baofu2 |
1. China Institute of Atomic Energy, Beijing 102413 China;
2. Ratection Co. Ltd. |
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Abstract Objective To meet the requirements of emergency preparation and response in case of radiation accidents, it is necessary to monitor the thyroid dose, estimate effective dose of the exposed individuals quickly and determine the contamination levels and nuclide types as soon as possible for corresponding treatment.Methods Based on the Monte Carlo simulation results of the detection efficiencies for different sizes of NaI detectors and considering its portability and mobility,a portable thyroid radiation dosimeter was developed for rapid medical response in nuclear emergency situations. Furthermore, a software was also developed to estimatethe intake and the committed dose equivalent of radioactive iodine.Results The device is steady and reliable.The energy resolution is 7% (662 keV), and the lower detection limit is less than 15 Bq (for 131I).The detection speed reaches no less than 20 persons per hour, and its total weight is 30 kg. It meets the requirements of being portable and can be easily disassembled and assembled.Conclusion The device can be quickly transported to the accident site in the case of emergency, which meets the requirements of the emergency rescue team to carry out the monitoring and evaluation of thyroid dose on site, filling a technical gap.
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Received: 22 April 2019
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