The aim of this work was to use RESRAD-Build model to predict the resulting external and internal radiological doses received by the workers of manganese mine located in Southern Sinai. In order to achieve that goal, measurement of the activity concentrations of natural radionuclides in rock samples collected from the inside gallery of such mine, using hyper pure germanium (HPGe) detector. Radon gas concentrations were also measured. The average activity concentrations of ²³⁸U, ²²⁶Ra, ²³²Th, ⁴⁰K and ²¹⁰Pb in rock samples were 207.3, 155.5, 59.7, 304.5 and 119.3 Bq kg^–1, respectively. The average radon activity concentration was 1254.6 Bqm⁻³, which is equivalent to 0.135 WL. The radon concentration increases further as going deep inside the mine up to 6238 Bqm⁻³. RESRAD-Build model occupational effective dose equivalent (EDE) received by the workers, from natural radionuclides, dominated by ²²²Rn emanated from the parent nuclide ²²⁶Ra.There was good agreement between the occupational annual EDE calculated from the measured rock samples and that predicted by modeling, with estimated values of 83.8 and 82.1 mSvy⁻¹, respectively. This radiological dose assessment indicated the predominance of internal pathways owing to radon decay products, in both cases (measured and modeled). The occupational radiological dose from the inhalation of radon and radon decay products resulted in a high lung cancer risk based on the current measurements and ventilation conditions within the mine.

中文翻译：

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工作条件和自然放射性水平对老锰矿工人职业剂量的影响。

这项工作的目的是使用RESRAD-Build模型来预测位于西奈南部的锰矿工人收到的外部和内部放射剂量。为了实现该目标，使用超纯锗（HPGe）检测器测量从此类矿山的内部画廊收集的岩石样品中天然放射性核素的活性浓度。还测量了gas气浓度。岩石样品中的平均活度浓度分别为²³⁸ U，²²⁶ Ra，²³² Th，⁴⁰ K和²¹⁰ Pb ，分别为207.3、155.5、59.7、304.5和119.3 Bq kg ^–1。平均ra活度浓度为1254.6 Bqm ^-3，相当于0.135 WL。don浓度随着进入矿井深达6238 Bqm ^-3而进一步增加。RESRAD建立了工人从天然放射性核素接收的，以母体核素²²⁶ Ra释放的²²² Rn为主的模型职业有效剂量当量（EDE），从测得的岩石样本计算出的职业年EDE与预测的职业年EDE之间有很好的一致性通过建模，估计值为83.8和82.1 mSvy ^-1， 分别。放射性剂量评估表明，在两种情况下（测量和建模），ra衰变产物均是内部途径的主要来源。根据矿井中的当前测量和通风条件，from和ra衰变产物的吸入引起的职业放射剂量导致罹患肺癌的风险很高。