Retrospective luminescence dosimetry:: Development of approaches to application in populated areas downwind of the Chernobyl NPP
Retrospective luminescence dosimetry:: Development of approaches to application in populated areas downwind of the Chernobyl NPP
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DOI：
10.1097/01.hp.0000164654.66585.20
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发表时间：
2005-09-01
期刊：
影响因子：
2.2
通讯作者：
Petrov, SA
中科院分区：
文献类型：
--
作者：
Bailiff, IK;Stepanenko, VF;Petrov, SA
位于俄罗斯布扬斯克行政区切尔诺贝利核电站（NPP）顺风175公里处的Stary Vishkov居民区的10座建筑物中收集的烧制粘土砖（Cs-137, 1,470 kBq m(-2)）的累积吸收剂量由5个实验室使用发光技术测定。在每个地点，累积剂量减去自然本底剂量后，利用蒙特卡罗模拟得出的换算系数将其转化为空气中的吸收剂量。模拟采用了从当代土壤污染数据推断的源分布，并考虑了沉降的异质性。在四个地点计算了参考地点的累积剂量，使发光测定结果能够直接与使用确定性模型获得的空气中累积吸收剂量值进行比较。从蒙特卡罗模拟中还得到了土壤扰动较大的地方的“局部”转换因子。利用该因子计算的空气中“局部”累积剂量值与在每个采样地点使用确定性模型预测的值进行了比较，从而允许使用位置因子。待计算。所制订的方法一般适用于受放射性沉降物污染的有砖房的人口稠密地区。俄罗斯这一地区砖的发光技术的灵敏度足以评估由于低于20毫戈瑞的沉降物引起的砖的累积吸收剂量。
The cumulative absorbed dose in fired-clay bricks collected from ten buildings in the populated contaminated settlement (Cs-137, 1,470 kBq m(-2)) of Stary Vishkov, located 175 km downwind of the Chernobyl Nuclear Power Plant (NPP) in the Bryansk administrative region of Russia, was determined using luminescence techniques by five laboratories. At each location, the cumulative dose, after subtraction of the natural background dose, was translated to absorbed dose in air using conversion factors derived from Monte Carlo simulations. The simulations employed source distributions inferred from contemporary soil contamination data and also took into account heterogeneity of fallout deposition. At four locations the cumulative dose at a reference location was calculated, enabling the luminescence determinations to be compared directly with values of cumulative absorbed dose in air obtained using deterministic models. A "local" conversion factor was also derived from the Monte Carlo simulations for locations where the disturbance of soil was significant. Values of the "local" cumulative dose in air calculated using this factor were compared with those predicted using the deterministic models at each sampled location, allowing location factors. to be calculated. The methodology developed is generally applicable to populated areas contaminated by radioactive fallout in which brick buildings are found. The sensitivity of the luminescence techniques for bricks from this region of Russia was sufficient to evaluate cumulative absorbed dose in brick due to fallout of less than 20 mGy.