Nuclear Techniques ›› 2015, Vol. 38 ›› Issue (11): 110501-110501.doi: 10.11889/j.0253-3219.2015.hjs.38.110501


Simulation study on original characteristic spectrum of gamma radiation field cosmic-induced on lunabase rocks

ZHAO Jiankun1 GE Liangquan1 ZHANG Qingxian1 LU Zhenrui1,2 LUO Yaoyao1   

  1. 1(College of Applied Nuclear Technology and Automation Engineering, Chengdu University of Technology, Chengdu 610059, China) 2(Application of Nuclear Technology Research Center, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China)
  • Received:2015-03-02 Revised:2015-07-10 Online:2015-11-10 Published:2015-11-13

Abstract: Background: With large differences in mass density, Basalt, KREEP and Dunite are representative and widely distributed on lunar surface. Cosmic-induced ?-ray is produced after energetic particles (Galactic Cosmic Rays, GCR; Solar Particle Event, SPE) impacting on lunabase rocks. Purpose: This study aims at discovering the factors of cosmic-induced ?-ray spectrum and then utilizing the gamma ray data for lunar exploration more efficiency. Methods: A Monte Carlo model for proton-induced gamma ray is designed for the FLUKA simulation software to research cosmic-induced gamma original spectrum. Data analysis is applied to find the relationship between the characteristic spectrum and the densities of lunabase rocks. Results: The model is appropriate to simulate cosmic-induced ?-ray original spectrum. A great variety of original spectrum characteristics, such as energies of main elements, positron annihilation peak and radiation balanced peak, are acquired. Conclusion: A positive correlation is found between mass density of lunabase rock and characteristic peak intensity. These researches for original spectrum can be applied to comparing different lunar gamma-ray spectrum and rock mass density mapping on lunar surface as a reference.

Key words: Lunabase, Cosmic-induced gamma field, Original spectrum, FLUKA