Study of the detection limit of manmade radionuclide detected by airborne gamma ray spectrometry

Weichong NI; Wenjun CAI; Guolin GAO

doi:10.11889/j.0253-3219.2018.hjs.41.100202

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Study of the detection limit of manmade radionuclide detected by airborne gamma ray spectrometry

LOW ENERGY ACCELERATOR, RAY AND APPLICATIONS | 更新时间：2021-05-19

- Study of the detection limit of manmade radionuclide detected by airborne gamma ray spectrometry
- NUCLEAR TECHNIQUES Vol. 41, Issue 10, Article number: 100202(2018)
- 作者机构：
  
  核工业航测遥感中心, 国家核应急航空监测技术支持中心, 国家核应急航空监测中心, 国家核应急救援航空辐射监测分队, 中核集团铀资源地球物理勘查技术中心(重点实验室) 石家庄 050002
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China
- DOI：10.11889/j.0253-3219.2018.hjs.41.100202
  CLC： TL751;TL817.2;X837
- Received：09 May 2018，
  
  Revised：01 July 2018，
  
  Published：10 October 2018
- 稿件说明：
移动端阅览
Weichong NI, Wenjun CAI, Guolin GAO. Study of the detection limit of manmade radionuclide detected by airborne gamma ray spectrometry[J]. Nuclear techniques, 2018, 41(10): 100202
DOI：

Weichong NI, Wenjun CAI, Guolin GAO. Study of the detection limit of manmade radionuclide detected by airborne gamma ray spectrometry[J]. Nuclear techniques, 2018, 41(10): 100202 DOI： 10.11889/j.0253-3219.2018.hjs.41.100202.

摘要

核与辐射航空监测中人工放射性核素探测下限是衡量核与辐射航空监测能力的一个重要指标。基于大体积NaI（Tl）探测器核与辐射航空监测系统、固定翼飞机（Y-12和Y-5飞机）在全国数个不同辐射背景地区不同飞行高度的测量数据，研究航空γ能谱探测人工放射性核素

137

Cs和

Co探测下限的影响因素。结果表明：随航测高度和航测飞行速度的降低，人工放射性核素的探测下限相应地降低；在同一个航测高度上，探测下限随辐射背景水平而增大；水域上对人工放射性核素的探测下限最低；随人工放射性核素γ射线能量的降低，探测下限反而增大。本次研究为核与辐射航空监测中有效控制影响因素降低人工放射性核素探测下限提供了重要依据。

Abstract

Background

The detection limit of manmade radionuclide in airborne monitoring is an important specification to measure detectable ability of airborne monitoring for nuclear and/or radiation.

Purpose

This study aims to find effect factors of detection limits of manmade radionuclide in airborne monitoring.

Methods

Based on the airborne monitoring data for the airborne monitoring system with NaI(Tl) detectors of the large volume (downward-looking for 50 341 cm

/upward-looking for 12 585 cm

)

Y-12 and Y-5 model wing-fixed aircraft

different altitude

and areas with the different radiation background levels

research diversification of detection limit of manmade radionuclide

137

Cs and

Co.

Results

Detection limits of manmade radionuclides decrease with the reducing of airborne altitude and flight speed. On the same airborne altitude

detection limits are corresponding to largen with the raise of radiation background level. Detection limits of manmade radionuclides are of the minimum on the waters. Detection limits are opposite to largen with the reducing of gamma-ray energy of manmade radionuclides.

Conclusion

Research provides important basis on how to control factors effectively and reduce detection limits of manmade radionuclides.

关键词

Keywords

references

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