Lee J K, Chilton A B, Ragheb M
Radiat Res. 1986 Aug;107(2):147-62.
The effect of the fluctuating cross-section structure in the energy range of 0.4 to 10.0 MeV on the dosimetric response functions of neutrons in the ICRU standard tissue sphere is analyzed. A Monte Carlo method with point-energy cross-section values, including coupled transport for neutrons and secondary charged particles, was used in the direct estimation of the absorbed dose and the dose equivalent. An approach was adopted in which source-energy band-average responses were calculated instead of the more usual approach involving monoenergetic source neutrons. Data were obtained for the newly defined term, ambient dose equivalent, at various depths, as well as the older index quantities. Such data generated were compared with information from other research workers. In general, good agreement was found, with due consideration to the differences engendered by the use of the source-energy band-average approach. Agreement was poorest for very shallow depths, corresponding to outer skin thickness, this being a most difficult depth to calculate accurately. The dosimetric data generated in this study should contribute to the ongoing efforts for the standardization of neutron protection dosimetry.
分析了在0.4至10.0 MeV能量范围内波动截面结构对ICRU标准组织球中中子剂量响应函数的影响。在直接估算吸收剂量和剂量当量时，采用了一种基于点能量截面值的蒙特卡罗方法，该方法包括中子和次级带电粒子的耦合输运。采用的方法是计算源能量带平均响应，而不是更常用的涉及单能源中子的方法。获得了新定义的术语“周围剂量当量”在不同深度以及较旧指标量的数据。将生成的数据与其他研究人员的信息进行了比较。总体而言，考虑到源能量带平均方法的使用所产生的差异后，发现吻合度良好。对于非常浅的深度（对应于表皮厚度），吻合度最差，这是最难精确计算的深度。本研究中生成的剂量学数据应有助于正在进行的中子防护剂量学标准化工作。
