Nuclear Techniques ›› 2018, Vol. 41 ›› Issue (10): 100202-100202.doi: 10.11889/j.0253-3219.2018.hjs.41.100202

• LOW ENERGY ACCELERATOR, RAY AND APPLICATIONS • Previous Articles     Next Articles

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

NI Weichong, CAI Wenjun, GAO Guolin   

  1. Airborne Survey and Remote Sensing Center of Nuclear Industry, China National Airborne Monitoring Technical Support Center for Nuclear Emergency, China National Airborne Monitoring Center for Nuclear Emergency, China National Airborne Radiation Monitoring Team for Nuclear Emergency Rescue, CNNC Key Laboratory of Uranium Resource Geophysical Exploration Technology, Shijiazhuang 050002, China
  • Received:2018-05-09 Revised:2018-07-01 Online:2018-10-10 Published:2018-10-16
  • Supported by:
    Supported by National Natural Science Foundation of China (No.41474107), National Key Research Development Program in China (No.2017YFC0602105)

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 cm3/upward-looking for 12 585 cm3), 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 137Cs and 60Co.[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.

Key words: Airborne monitoring for nuclear and/or radiation, NaI(Tl) detectors, Airborne gamma ray spectrometer, 137Cs, 60Co, Detection limit

CLC Number: 

  • TL75+1