Villafañe Roberto Mendez, de Sousa Lacerda Marco Aurélio, Blanco Xandra Campo, Sánchez Francisco González, Vega-Carrillo Héctor René
Laboratorio de Patrones Neutrónicos, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Av. Complutense 40, 28040 Madrid, Spain.
Laboratório de Calibração de Dosímetros, Centro de Desenvolvimento da Tecnologia Nuclear, CDTN/CNEN, Av. Presidente Antônio Carlos, 6627, 31270-901, Belo Horizonte, Brazil.
Radiat Prot Dosimetry. 2019 Dec 31;186(4):452-461. doi: 10.1093/rpd/ncz050.
In order to estimate the anisotropy emission of 241Am-Be and 252Cf neutron sources from the Spanish Neutron Standards Laboratory (LPN/CIEMAT) detailed models of sources capsules and capsule holders were designed with the MCNPX code. Simulations of the sources inside the capsules without the capsule holders were done to validate the MC model by comparison with experimental results provided by other authors. After that, the capsule holders were incorporated to the simulation. In general, a good agreement has been found between measurements and our calculations. Results show the additional encapsulations have significant influence on anisotropy factors, energy spectra and dose rates.
为了估算西班牙中子标准实验室（LPN/CIEMAT）的241Am-Be和252Cf中子源的各向异性发射，利用MCNPX代码设计了源胶囊和胶囊支架的详细模型。在没有胶囊支架的情况下对胶囊内的源进行了模拟，通过与其他作者提供的实验结果进行比较来验证蒙特卡罗模型。之后，将胶囊支架纳入模拟。总体而言，测量结果与我们的计算结果吻合良好。结果表明，额外的封装对各向异性因子、能谱和剂量率有显著影响。
