# Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2015, Vol. 26 ›› Issue (6): 060202

• LOW ENERGY ACCELERATOR, RAY AND APPLICATIONS •

### Energy spectrum measurement and dose rate estimation of natural neutrons in Tibet region

WU Jian-Hua , XU Yong-Jun , LIU Sen-Lin, WANG Chuan-Gao

1. Department of Radiation Security, China Institute of Atomic Energy, Beijing 102413, China
• Contact: XU Yong-Jun E-mail:li000201@sohu.com
• Supported by:

Supported by National Natural Science Foundation of China (No.11575294)

WU Jian-Hua, XU Yong-Jun, LIU Sen-Lin, WANG Chuan-Gao . Energy spectrum measurement and dose rate estimation of natural neutrons in Tibet region.Nuclear Science and Techniques, 2015, 26(6): 060202

Abstract:

In this work, natural neutron spectra at nine sites in Tibet region were measured using a multi-sphere neutron spectrometer. The altitude-dependence of the spectra total fluence rate and ambient dose equivalent rate were analyzed. From the normalized natural neutron spectra at different altitudes, the spectrum fractions for neutrons of greater than 0.1MeV do not differ obviously, while those of the thermal neutrons differ greatly from each other. The total fluence rate, effective dose rate and the ambient dose equivalent rate varied with the altitude according to an exponential law.