Lee Kuo-Wei, Yuan Ming-Chen, Jiang Shiang-Huei, Sheu Rong-Jiun
Institute of Nuclear Energy Research, Longtan, Taoyuan 32546, Taiwan, ROC Institute of Nuclear Engineering and Science, National Tsing Hua University, 101, Sec. 2, Kuang-Fu Road, Hsinchu 30013, Taiwan, ROC.
Institute of Nuclear Energy Research, Longtan, Taoyuan 32546, Taiwan, ROC.
Radiat Prot Dosimetry. 2014 Oct;161(1-4):233-6. doi: 10.1093/rpd/nct333. Epub 2013 Dec 22.
Standard Bonner spheres and proposed high-sensitivity Bonner cylinders were calibrated in a neutron calibration room, using a (252)Cf source. The Bonner sphere system consists of 11 polyethylene (PE) spheres of various diameters and 4 extended spheres that comprise embedded metal shells. Similar to the design of Bonner spheres, a set of Bonner cylinders was assembled using a large cylindrical (3)He tube as the central probe, which was wrapped using various thicknesses of PE. A layer of lead was employed inside one of the PE cylinders to increase the detection efficiency of high-energy neutrons. The central neutron probe used in the Bonner cylinders exhibited an efficiency of ∼17.9 times higher than that of the Bonner spheres. However, compared with the Bonner spheres, the Bonner cylinders are not fully symmetric in their geometry, exhibiting angular dependence in their responses to incoming neutrons. Using a series of calculations and measurements, this study presents a systematic comparison between Bonner spheres and cylinders in terms of their response functions, detection efficiencies, angular dependences and spectrum unfolding.
标准的邦纳球和提议的高灵敏度邦纳圆柱在中子校准室中使用（252）Cf源进行了校准。邦纳球系统由11个不同直径的聚乙烯（PE）球和4个包含嵌入式金属壳的扩展球组成。与邦纳球的设计类似，一组邦纳圆柱以一个大的圆柱形（3）He管作为中心探测器进行组装，该探测器用不同厚度的PE包裹。在其中一个PE圆柱内部使用了一层铅来提高高能中子的探测效率。邦纳圆柱中使用的中心中子探测器的效率比邦纳球高约17.9倍。然而，与邦纳球相比，邦纳圆柱在几何形状上并不完全对称，在对入射中子的响应中表现出角度依赖性。通过一系列计算和测量，本研究对邦纳球和圆柱在响应函数、探测效率、角度依赖性和能谱展开方面进行了系统比较。
