Nuclear Techniques ›› 2015, Vol. 38 ›› Issue (1): 10501-010501.doi: 10.11889/j.0253-3219.2015.hjs.38.010501


Monte-Carlo-method-based calibration for an albedo neutron dosimeter

ZHANG Guoqing1 LI Pengbo2 LI Changyuan1 CAI Jun1 XIA Xiaobin1   

  1. 1(Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China) 2(China Institute of Atomic Energy, Beijing 102413, China)
  • Received:2014-07-07 Revised:2014-10-22 Online:2015-01-10 Published:2015-01-07

Abstract: Background: By use of backscattering neutrons from human body, Albedo neutron dosimeters can improve the response, which is normally dependent on the type of the neutron field, such as the energy spectrum of neutrons and the scattering. Therefore, calibrations need to be carried out to determine the relation between the reading of dosimeters and the dose value. Purpose: Experiment based calibration of albedo dosimeters is complicated and time consuming. Monte Carlo method can be applied to make the calibration in order to lower the cost and time. Methods: Monte Carlo code was used to make the calculation for the response of dosimeters in different neutron fields. In comparison with the response in a reference neutron filed, a relative calibration factor in a measured neutron field can be calculated. Results: The calibration was performed for an Alnor albedo dosimeter in the neutron fields of interim storage facilities both in Germany and in China, and the relative calibration factors to a reference neutron field were calculated. The relative response ranges from 10 to 20, and the reading ratio of field neutron to albedo neutron is about 2 to 3. Conclusion: Based on the results, calibration factor for reactors and linacs can be applied for Alnor albedo dosimeter in the neutron fields of interim storage facilities.

Key words: Neutron filed, Thermoluminescence Detector (TLD), Albedo, Alnor, Calibration, Monte Carlo