利用MCNPx程序计算了宽能谱中子雷姆仪的响应曲线. 计算表明, 增加铅层对低能中子的响应没有明显的影响, 但在高能区(几百MeV以上)宽能谱中子雷姆仪的响应与铅层的厚度有关. 铅层厚度为0.6 cm时响应比普通雷姆仪提高约3倍, 当铅层厚度增加到1.2 cm时响应高约5倍. 虽然计算结果与ICRP建议书中的H*(10)曲线相比还有一定的差别, 但改变慢化体的结构对提高高能中子的探测效率是有明显效果的.
参考文献
| [1] | Stephens L D, Smith A R. Fast Neutron Surveys Using Indium Foil Activation. Lawrence Radiation Laboratory Report UCRLL-8418, Aug. 1958. |
| [2] | Bramblett R L, Ewing R I, Bonner T W. Nucl Instr and Meth, 1960, 9: 1. |
| [3] | Andersson I O, Braun J. In Proceedings of the IAEA Symposium on Neutron Dosimetry, Vienna, 1963, 2: 87. |
| [4] | Birattari C, Ferrrari A, Nuccetelli C, et al. Nucl Inst and Meth, 1990, A297: 250. |
| [5] | Mares V, Sannikov A V, Schraube H. Nucl Inst and Meth, 2002, A476: 341. |
| [6] | Li Jianping, Tang Yueli, Liu Shudong , et al. Rad Prot Dosi, 1996, 67( 3): 179. |
| [7] | Waters L S, MCNPXTM USER's Manual, Version 2.1.5, 1999. |
| [8] | ICRP Publication 74, Conversion Coefficients for Use in Radiological Protection Against External Radiation, Edited by ICRP, 1996. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%