Radiation protection factor (RPF) values are relevant to various US defense and civil support organizations. An equation was developed to quantify the angular-dependent protection of a shielding configuration in the presence of a mono-energetic radiation field. Values of ambient dose equivalent, H*(10), were computed with version 6.1 of the Monte Carlo N-Particle Code (MCNP6.1) for more than 70 distinct, mono-energetic, planar photon and neutron fields using both the kerma approximation and energy deposition from primary and secondary radiations. The two computational approaches were compared, and the MCNP6.1 models were then modified to simulate the same radiation fields and compute values of directional dose equivalent, H'(10,α), in a tissue sphere centered inside a surrogate vehicle for 13 angles of incidence. Values of H*(10) and H'(10,α) were recast as energy- and angular-dependent RPF values for the incident field-shielding geometries and tabulated. Examples of implementation are provided, and limitations are discussed.

中文翻译：

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应用 MCNP6.1 代码来估计简单替代车辆的辐射防护系数值的方向相关性。

辐射防护系数 (RPF) 值与各种美国国防和民间支持组织相关。开发了一个方程来量化在存在单能辐射场的情况下屏蔽配置的角度相关保护。环境剂量当量 H*(10) 的值是使用 6.1 版蒙特卡洛 N 粒子代码 (MCNP6.1) 计算的，用于使用 kerma 近似值计算 70 多个不同的单能平面光子和中子场以及来自一次和二次辐射的能量沉积。比较两种计算方法，然后修改 MCNP6.1 模型以模拟相同的辐射场并计算定向剂量当量 H'(10,α) 的值，该值位于以替代载体内为中心的 13 个角度的组织球体中发生率。H*(10) 和 H'(10, α) 被重新定义为入射场屏蔽几何形状的能量和角度相关 RPF 值并制成表格。提供了实现示例，并讨论了限制。