Nuclear Techniques ›› 2020, Vol. 43 ›› Issue (7): 70502-070502.doi: 10.11889/j.0253-3219.2020.hjs.43.070502

• NUCLEAR PHYSICS, INTERDISCIPLINARY RESEARCH • Previous Articles     Next Articles

Experimental measurement study on 127Xe intercomparison sample for CTBT radionuclide laboratories

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

  1. CTBT Beijing National Data Centre and Beijing Radionuclide Laboratory, Beijing 100085, China
  • Received:2020-04-21 Revised:2020-05-06 Online:2020-07-15 Published:2020-07-16
  • About author:LI Qi, male, born in 1980, graduated from China Academy of Atomic Energy with a doctor's degree, focusing on particle physics and nuclear physics
  • Supported by:
    National Natural Science Foundation of China(11975109)

Abstract: Background

Compared with four radioactive xenon isotopes (131Xem, 133Xem, 133Xe and 135Xe) involved in the comprehensive test ban treaty (CTBT), 127Xe has a longer half-life, hence is easy to be purified, and exists in environment at extremely low level. The Provisional Technical Secretariat (PTS) of the Preparatory Commission for Comprehensive Nuclear-Test-Ban Treaty Organization (CTBTO) plans to conduct quality assurance activities for noble gas systems of international monitoring system (IMS) through reanalyzing the 127Xe spike samples from IMS stations in the radionuclide laboratories.

Purpose

This study aims to assess the reliability of 127Xe measurement scheme in Beijing radionuclide laboratory through the intercomparison of 127Xe radioactivity organized by PTS.

Methods

The 127Xe sample contained in the stainless steel bottle was transferred to a gas cell with carbon fiber bottom and stainless steel body. Then the 127Xe sample was measured by an HPGe detector which was calibrated the detection efficiency by the standard source accurately. The radioactivity of 127Xe was quantified by analyzing the gamma spectra.

Results

The radioactivity of 127Xe determined by this study is (53±10) Bq. The deviation between measurement result and reference value is 4.3%.

Conclusions

From the evaluation scores of this intercomparison, the accurate measurement result is achieved by Beijing radionuclide laboratory.

Key words: 127Xe, Intercomparison, Radioactivity, HPGe γ spectrometer

CLC Number: 

  • TL99