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1.荆楚理工学院电子信息工程学院 荆门 448000;
2.宝鸡高新技术研究所 宝鸡 721013
赵娟,女,1979年出生,2009年于华中科技大学获硕士学位,研究领域为通信系统盲均衡技术和无损检测与监控技术
收稿日期:2015-10-12,
录用日期:2015-12-16,
纸质出版日期:2016-01-25
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赵娟, 高正明. 支撑体对γ辐射物探测数据的影响[J]. 核技术, 2016,39(2):020401
Juan ZHAO, Zhengming GAO. Influence of the support body on radiation detection for gamma radiator[J]. Nuclear techniques, 2016, 39(2): 020401
赵娟, 高正明. 支撑体对γ辐射物探测数据的影响[J]. 核技术, 2016,39(2):020401 DOI: 10.11889/j.0253-3219.2016.hjs.39.020401.
Juan ZHAO, Zhengming GAO. Influence of the support body on radiation detection for gamma radiator[J]. Nuclear techniques, 2016, 39(2): 020401 DOI: 10.11889/j.0253-3219.2016.hjs.39.020401.
在对大质量高安全性要求的γ源进行辐射探测时
发现数据误差很大
不能用于定量分析。为此
基于探测器端面注量率参数理论探析了地面或支撑台对探测器数据影响的简化计算方法
采用蒙特卡罗方法分析了混凝土支撑体对粒子注量率的影响程度
研究了铅作为次级粒子吸收物质时
铅厚度和半径与注量率测量误差之间的关系。研究结果表明
在放射性材料辐射探测过程中
为减少混凝土支撑体对辐射探测数据的影响
应采用厚度不小于0.5 cm、半径不小于源高3倍的铅板作为次级粒子吸收体
可将探测数据最大误差由22%减少至15%左右
最小可接近10%
实验结果证实了该方法的有效性。
Background:
2
The datum error of the gamma detection on large-mass and high security controlled radioactive materials is too large for quantitative analysis.
Purpose:
2
This study aims to accurately measure the radiation of gamma radioactive materials placed upon support body.
Methods & Results:
2
Based on the theory of particle flux parameters on the cross section of detection
the method to calculate the influence of the support body on radiation detection was simplified. Then
simulations were done to find the error distributions with Monte Carlo method when the materials were placed on the concrete ground. In order to reduce the detection error
a plate of lead was recommended to be inserted between the materials and the concrete ground. The best thickness of the lead layer was simulated and experimental verification was performed.
Results:
2
Simulation results show that if a lead layer thicker than 0.5 cm exists between the radioactive materials and the concrete ground. The relative detection error could be reduced from 22% to 15% or even the least of 10% in some particular situations.
Conclusion:
2
If a large-mass or high security controlled gamma radiator would be detected
it should be placed on a lead layer thicker than 0.5 cm in case of reducing the datum errors.
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