Nuclear Techniques ›› 2017, Vol. 40 ›› Issue (5): 50402-050402.doi: 10.11889/j.0253-3219.2017.hjs.40.050402

• NUCLEAR ELECTRONICS AND INSTRUMENTATION • Previous Articles     Next Articles

Design of dual channel artificial radioactive aerosol monitoring system

ZENG Guoqiang1, LAI Maolin1, GU Min1, QING Song1, YANG Kun2, GU Yi1, XIA Yuan1, GE Liangquan1, XIAO Ming2   

  1. 1 Nuclear Technology Key Laboratory of Earth Science, Chengdu University of Technology, Chengdu 610059, China;
    2 Corporation of Chinese Guangdong Nuclear Industrial Group of JIUYUAN Technology, Chengdu 610200, China
  • Received:2016-11-22 Revised:2017-03-01 Online:2017-05-10 Published:2017-05-03
  • About author:10.11889/j.0253-3219.2017.hjs.40.050402
  • Supported by:

    Supported by National Natural Science Foundation of China (No.41474159), “863” Program (No.2012AA061803),Youth Foundation of Science Technology Department of Sichuan Province (No.2015JQ0035)

Abstract:

Background: The environments for monitoring artificial radioactive aerosol are often complex, as sometimes it could even be in underground caverns, tunnels or underground nuclear facilities, of which the concentration of both radon and its radioactive products would be up to 103-104 Bq·m-3. However, under high radon condition, the tailing phenomenon of radon and thorium peaks could interfere with radioactive counts and the artificial aerosol counts, thus affecting the detection limit of radioactive aerosol. Purpose:This study aims to design a special normal-pressured artificial aerosol monitoring equipment, which can operate well under the high radon environment. Methods: Dual-channel synchro measurement was employed to combine high accuracy of the vacuum channel and the fast response of the normal pressure channel. Results: Implemented aerosol monitoring system can respond rapidly to plutonium and uranium aerosol in atmospheric environment, and in the case of artificial radionuclide leakage, the fastest measurement results can be obtained in 30 min. In general, the theoretical detection limit can reach 10-4-10-3 Bq·m-3, and the verifiable detection limit of uranium and plutonium are 0.1 Bq·m-3 and 0.02 Bq·m-3, respectively. Conclusion: This design can be applied to a variety of high radon environments which require unmanned monitoring for artificial nuclear.

Key words: High radon environment, Artificial radioactive aerosol, Theoretical detection limit, Vacuum aerosol measurement

CLC Number: 

  • TL84