Hawkes N P, Freedman R, Tagziria H, Thomas D J
Neutron Metrology Group, DQL, National Physical Laboratory, Hampton Road, Teddington, Mddx. TW11 0LW, UK.
Radiat Prot Dosimetry. 2007;126(1-4):78-82. doi: 10.1093/rpd/ncm145. Epub 2007 May 12.
The authors have measured the emission anisotropy from a (252)Cf spontaneous fission neutron source in an X1 encapsulation. The measurements were made in a large low-scatter laboratory using a long counter, and data were taken at angles varying in 10 degrees steps from 0 degrees to 180 degrees relative to the cylindrical axis of the source. Corrections were made for room scatter, loss of neutrons due to air scatter and detector dead time. Calculations corresponding to these measurements were subsequently carried out using the two Monte Carlo codes MCNP and MCBEND, and the results are compared with the measurements and with each other.
作者们测量了X1封装的（252）Cf自发裂变中子源的发射各向异性。测量在一个大型低散射实验室中使用长计数器进行，数据是在相对于源的圆柱轴从0度到180度以10度步长变化的角度下获取的。对房间散射、空气散射导致的中子损失以及探测器死时间进行了校正。随后使用两个蒙特卡罗代码MCNP和MCBEND进行了与这些测量对应的计算，并将结果与测量值以及彼此进行了比较。
