Accurate measurement of <sup>131</sup>Xe<sup>m</sup> activity concentration by internal gas proportional counting system

Qi LI; Shilian WANG; Yuanqing FAN; Yungang ZHAO; Xinjun ZHANG; Huaimao JIA; Shujiang LIU; Yinzhong CHANG

doi:10.11889/j.0253-3219.2018.hjs.41.010403

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Accurate measurement of ¹³¹Xe^m activity concentration by internal gas proportional counting system

NUCLEAR ELECTRONICS AND INSTRUMENTATION | 更新时间：2021-05-19

- Accurate measurement of ¹³¹Xe^m activity concentration by internal gas proportional counting system
- NUCLEAR TECHNIQUES Vol. 41, Issue 1, Article number: 010403(2018)
- 作者机构：
  
  禁核试北京国家数据中心和北京放射性核素实验室北京 100085
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China
- DOI：10.11889/j.0253-3219.2018.hjs.41.010403
  CLC： TL816.4
- Received：23 October 2017，
  
  Revised：12 November 2017，
  
  Published：10 January 2018
- 稿件说明：
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Qi LI, Shilian WANG, Yuanqing FAN, et al. Accurate measurement of ¹³¹Xe^m activity concentration by internal gas proportional counting system[J]. Nuclear techniques, 2018, 41(1): 010403
DOI：

Qi LI, Shilian WANG, Yuanqing FAN, et al. Accurate measurement of ¹³¹Xe^m activity concentration by internal gas proportional counting system[J]. Nuclear techniques, 2018, 41(1): 010403 DOI： 10.11889/j.0253-3219.2018.hjs.41.010403.

摘要

131

、

133

、

133

Xe和

135

Xe是全面禁止核试验条约（Comprehensive Nuclear-Test-Ban Treaty，CTBT）监测地下核试验最重要的核素。氙同位素活度通常采用HPGe γ能谱法和β-γ符合法等相对方法测量，准确刻度测量系统的探测效率是氙同位素活度准确测量的关键。本文介绍了用内充气正比计数管系统通过长度补偿法准确测量

131

活度浓度的方法，

131

活度浓度测量结果为（1.75±0.01）Bq·mL

-1

，为相对测量系统的探测效率刻度提供了活度标准。

Abstract

Background

Due to the chemical inertness

the noble gases escape more easily from underground nuclear explosions into atmosphere than the fission products in solid form. Among the noble gases

four of radioxenon isotopes

i.e.

131

133

Xe and

135

have high fission yields with half-lives of several hours to several days

which can be detected after long distances diffusion from where they were released. So these four radioxenon isotopes play a key role for underground nuclear test monitoring compliance with comprehensive nuclear-test-ban treaty (CTBT). Accurate measurement of radioxenon isotopes activities is a key technique to identify characteristic of nuclear test from the monitoring data.

Purpose

Radioxenon isotopes activities are usually determined using relative measurement methods-HPGe γ spectrometers or β-γ coincidence systems. The detection efficiency calibration of the relative measurement system by standard samples is the critical factor of these relative measurement methods.

Methods

This article describes the process and method of accurate measurement of activity concentration of

131

by internal gas proportional counting system which adopted length-compensated method.

Results

The activity concentration of

131

is determined to be (1.75±0.01) Bq·mL

–1

using internal gas proportional counters with corrections for dead time

background

discrimination

end effects and wall effects.

Conclusion

The activity concentration of

131

sample was measured accurately

which can be used to calibrate detection efficiency of relative measurement system as a standard sample.

关键词

Keywords

references

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Related Institution

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⁰

Accurate measurement of 131Xem activity concentration by internal gas proportional counting system

DOI：10.11889/j.0253-3219.2018.hjs.41.010403

摘要

Abstract

关键词

Keywords

references

Accurate measurement of ¹³¹Xe^m activity concentration by internal gas proportional counting system