Tanimura Y, Tsutsumi M, Yoshizawa M
Department of Radiation Protection, Nuclear Science and Research Institute, Japan Atomic Energy Agency, 2-4 Shirakata-Shirane, Tokai, Ibaraki 319-1195, Japan
Department of Radiation Protection, Nuclear Science and Research Institute, Japan Atomic Energy Agency, 2-4 Shirakata-Shirane, Tokai, Ibaraki 319-1195, Japan.
Radiat Prot Dosimetry. 2014 Oct;161(1-4):144-8. doi: 10.1093/rpd/nct345. Epub 2014 Jan 31.
A portable, light-weight long counter (LC) with small dimensions was developed. This LC consists of a (3)He thermal neutron counter, a cylindrical moderator and outer shields. It was designed to have an almost flat response in a neutron energy range of 0.4 eV to 5 MeV. The portable LC has a radius of 11 cm and a length of 39 cm. Its weight was successfully reduced to 15 kg. Polystyrene was employed instead of polyethylene for the front part of the moderator in order to increase the sensitivity to low-energy neutrons. The response function calculated using the MCNP code was consistent with the results of experiments using monoenergetic neutron calibration fields.
开发了一种尺寸小、便于携带的轻型长计数器（LC）。该LC由一个³He热中子计数器、一个圆柱形慢化剂和外屏蔽组成。其设计目的是在0.4 eV至5 MeV的中子能量范围内具有几乎平坦的响应。便携式LC的半径为11 cm，长度为39 cm。其重量成功减轻至15 kg。慢化剂前部采用聚苯乙烯代替聚乙烯，以提高对低能中子的灵敏度。使用MCNP代码计算的响应函数与使用单能中子校准场的实验结果一致。
