Measurement of γ absorption dose rate through measuring the full energy peak of γ spectrum

HE Jun; YANG Chaowen

doi:10.11889/j.0253-3219.2014.hjs.37.070403

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Measurement of γ absorption dose rate through measuring the full energy peak of γ spectrum

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- Measurement of γ absorption dose rate through measuring the full energy peak of γ spectrum
- NUCLEAR TECHNIQUES Vol. 37, Issue 7, Article number: 070403(2014)
- 作者机构：
  
  1. 四川大学物理科学与技术学院,成都,610065
  2. 四川大学辐射物理及技术教育部重点实验室,成都,610065
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2014.hjs.37.070403
  CLC：
- Published：07 July 2014
- 稿件说明：
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HE Jun, YANG Chaowen. Measurement of γ absorption dose rate through measuring the full energy peak of γ spectrum[J]. Nuclear techniques, 2014, 37(7): 070403
DOI：

HE Jun, YANG Chaowen. Measurement of γ absorption dose rate through measuring the full energy peak of γ spectrum[J]. Nuclear techniques, 2014, 37(7): 070403 DOI： 10.11889/j.0253-3219.2014.hjs.37.070403.

摘要

提出了通过γ能谱全能峰测量吸收剂量的方法，定义了全能峰角响应函数。采用蒙特卡罗方法计算了50 mm×50 mm NaI(Tl)探测器的平均角响应随射线能量的变化，用标准点源137Cs、60Co、152Eu、133Ba和参考辐射场137Cs、60Co、226Ra、241Am进行了实验验证。结果证明，在近似各向同性的条件下，对标准点源的测量结果与理论值相比误差小于2%，对参考辐射场的测量结果与电离室测量结果相差小于3%。该方法适合低能到高能的较宽能谱段剂量率测量，不仅能测出某种核素对总剂量率的贡献，且能同时分辨核素种类，无需实验刻度。

Abstract

Background: At present most radiation dose meters have the serious problem of energy response

and they just use the count rate plus relative correction method to measure the dose rate. This method has large error

and cannot distinguish the type of radionuclide

also cannot obtain the contribution of each radionuclide to the dose rate. Purpose: The research of new method is to measure the dose rate and improve the accuracy of measurement. Methods: The method of γ dose rate measurement through measuring full energy peak of γ spectrum was put forward

the angular response function of parallel γ ray injected into detector was defined. The average angular response over full space in the energy range from 0.02 MeV to 3 MeV was calculated by Monte Carlo simulation for ?50mm×50mm NaI(Tl) detector. Measurement tests have been done using standard radioactive sources of 137Cs

60Co

152Eu

133Ba and in reference radioactive field of 137Cs

60Co

226Ra

241Am in a national lab. Results: The test errors are smaller than 2% compared with the theoretical value for standard sources

and smaller than 3% compared with the value of PTW 10 L spherical chamber for reference radiation field. Conclusion: The results show that the method is suitable for the dose rate measurement for a wide range of energy without experimental calibration

can calculate the dose rate of different energy ray

and at the same time identify the radioactive nuclides in the radiation source. Abstract

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四川大学原子核科学技术研究所辐射物理及技术教育部重点实验室

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