用内充气正比计数管准确测量<sup>131</sup>Xe<sup>m</sup>活度浓度

李奇; 王世联; 樊元庆; 赵允刚; 张新军; 贾怀茂; 刘蜀疆; 常印忠

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

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用内充气正比计数管准确测量¹³¹Xe^m活度浓度

核电子学与仪器 | 更新时间：2021-05-19

- 用内充气正比计数管准确测量¹³¹Xe^m活度浓度
- Accurate measurement of ¹³¹Xe^m activity concentration by internal gas proportional counting system
- 核技术 2018年41卷第1期文章编号：010403
- 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：
  
  [ "李奇, 男, 1980年出生, 2016年于中国原子能科学研究院获博士学位, 研究领域为粒子物理与原子核物理", "LIU Wenbiao, male, born in 1990, graduated from Lanzhou University with a master's degree in 2015, focusing on nuclear techniques and application" ]
- 基金信息：
  
  国家自然科学基金青年科学基金(11505082)
- DOI：10.11889/j.0253-3219.2018.hjs.41.010403
  中图分类号： TL816.4
- 收稿日期：2017-10-23，
  
  修回日期：2017-11-12，
  
  纸质出版日期：2018-01-10
- 稿件说明：
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李奇, 王世联, 樊元庆, 等. 用内充气正比计数管准确测量¹³¹Xe^m活度浓度[J]. 核技术, 2018,41(1):010403

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
李奇, 王世联, 樊元庆, 等. 用内充气正比计数管准确测量¹³¹Xe^m活度浓度[J]. 核技术, 2018,41(1):010403 DOI： 10.11889/j.0253-3219.2018.hjs.41.010403.

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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用内充气正比计数管准确测量131Xem活度浓度

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

摘要

Abstract

关键词

Keywords

references

用内充气正比计数管准确测量¹³¹Xe^m活度浓度

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