The key component in the so-called EPRI effective dose equivalent (EDE) methodology is an algorithm that utilizes two dosimeters (instead of multiple dosimeters) to predict the EDE for external photon exposures. The exposure scenarios that were previously studied in deriving the algorithm include parallel photon beams and point sources 33 cm from the body surface. The motivation for this study was the need to investigate source locations within 33 cm from the body so the method is more widely applicable. The ORNL stylized mathematical human phantoms and the MCNP code were used to calculate organ doses in this study. This paper presents the EDE data for point gamma sources at 0.3, 1.0, and 1.5 MeV, respectively, which are located at 10 cm from the surface of the body. The results and analyses show that the locations ranging from the overhead to the foot have resulted in conservative ratios except for two general regions near the front upper thigh and directly overhead. If all locations considered in this study were averaged for each photon energy, the overall ratio is on the conservative side. These data suggest that the EPRI EDE methodology is still valid for sources located 10 cm from the body, although the chance for resulting in a non-conservative estimate of the EDE has increased in comparison with the sources located at 30 cm from the body. Finally, this paper provides recommendations on how to apply the EPRI EDE methodology.

译文

:所谓的EPRI有效剂量当量(EDE)方法中的关键组件是一种算法,该算法利用两个剂量计(而不是多个剂量计)来预测外部光子暴露的EDE。先前在推导算法时曾研究过的曝光场景包括平行光子束和距体表33 cm的点光源。这项研究的动机是需要调查距人体33厘米以内的放射源位置,因此该方法更广泛地适用。在本研究中,使用了ORNL程式化的数学人体模型和MCNP代码来计算器官剂量。本文介绍了分别位于距人体表面10 cm处的0.3 MeV,1.0 MeV和1.5 MeV的点伽马源的EDE数据。结果和分析表明,从头顶到脚的位置范围导致了保守的比率,除了大腿前上方和直接头顶附近的两个一般区域。如果在本研究中考虑的所有位置均针对每种光子能量求平均值,则总体比率处于保守的一面。这些数据表明,EPRI EDE方法对于距离人体10厘米处的放射源仍然有效,尽管与位于人体30厘米处的放射源相比,导致EDE非保守估计的机会有所增加。最后,本文提供了有关如何应用EPRI EDE方法的建议。

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