Nuclear Techniques ›› 2016, Vol. 39 ›› Issue (11): 110201-110201.doi: 10.11889/j.0253-3219.2016.hjs.39.110201

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

Analyzing airborne gamma-ray spectrum by the least square method

WU Hexi1,2,3, GE Liangquan3, LUO Yaoyao3, LIU Yibao1,2, YU Fei2   

  1. 1 Engineering Research Center of Nuclear Technology Application, Ministry of Education, East China University of Technology, Nanchang 330013, China;
    2 School of Nuclear Science and Engineering, East China University of Technology, Nanchang 330013, China;
    3 Chengdu University of Technology, Chengdu 610059, China
  • Received:2016-09-05 Revised:2016-09-26 Online:2016-11-10 Published:2016-11-12
  • Supported by:

    Supported by National Natural Science Foundation of China (No.11505027, No.11665001, No.41604116), Open-ended Foundation from Engineering Research Center of Nuclear Technology Application, Ministry of Education (No.HJSJYB2014-7&8)

Abstract:

Background: It is difficult to establish the least square method for parsing airborne gamma-ray spectrum because the approximately infinite stratum does not exist when it contains only 235U and 238U series, 232Th series or 40K. Purpose: This study aims to acquire the response spectrum of airborne gamma-ray spectrometry (AGS) by Monte Carlo simulation and establish the above-described method. Methods: Based on the principle of media interchange, the basic thought of modular stratum and energy partitioning for characteristic gamma-ray, the combination model is used to obtain the AGS' response spectrum of any shape of stratum by Monte Carlo simulation. And the least square model for solving airborne gamma-ray spectrum is established by the above response spectrum. Results: The corrected model of eU, eTh and 40K content in stratum is acquired by analyzing the eight airborne gamma-ray spectra from the dynamic scale model in Shijiazhuang City. The calculation values of 10 km survey lines coincide with the specification for AGS when the content of natural radioactivity nuclide is larger than 4×10-6. Conclusion: The results verify that the calculation model is a valid analytical technique of AGS for natural radioactivity nuclide in stratum. And it provides a valid method to acquire the AGS' response spectrum of artificial radioactivity nuclide.

Key words: Airborne gamma-ray spectrometry, Monte Carlo simulation, Least square method

CLC Number: 

  • TL817+.2