An intercomparison exercise is described that examines Monte Carlo modelling of anthropomorphic voxel phantoms in an idealized ground-contamination photon exposure scenario. Thirteen participants calculated and submitted organ and effective dose rates for comparison against a set of verified reference solutions. The effective dose rates are shown to agree with the reference value to within reasonable statistical uncertainties in five of the cases, though in only one of those was similar agreement also demonstrated in the evaluation of all requested organ dose rates. Orders-of-magnitude differences in doses are seen for some of the other participants, both internally within their own dataset and also relative to the reference solutions. Following limited feedback and suggestions from the organizer, up to two sets of revised solutions were resubmitted by some of the participants; these generally exhibited improved agreement, though not always. The overall observations and conclusions from this intercomparison exercise are summarized and discussed.

描述了一个比对练习，该练习在理想化的地面污染光子暴露场景中检查拟人体素幻影的蒙特卡罗建模。13 名参与者计算并提交了器官和有效剂量率，以与一组经过验证的参考溶液进行比较。在五个案例中，有效剂量率与参考值一致，在合理的统计不确定性范围内，尽管只有一个案例在所有要求的器官剂量率的评估中也证明了类似的一致性。对于其他一些参与者，在他们自己的数据集中内部以及相对于参考解决方案，都可以看到剂量的数量级差异。根据主办方有限的反馈和建议，一些参与者重新提交了多达两套修订后的解决方案；这些通常表现出更好的一致性，但并非总是如此。对这次比对活动的总体观察和结论进行了总结和讨论。