A gradient of radioactive contamination in Dolon village near the SNTS and comparison of computed dose values with instrumental estimates for the 29 August, 1949 nuclear test
A gradient of radioactive contamination in Dolon village near the SNTS and comparison of computed dose values with instrumental estimates for the 29 August, 1949 nuclear test
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DOI：
10.1269/jrr.47.a149
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发表时间：
2006-02-01
影响因子：
2
通讯作者：
Gusev, Boris I.
中科院分区：
文献类型：
--
作者：
Stepanenko, Valeriy F.;Hoshi, Masaharu;Gusev, Boris I.
分析了多伦村附近和村内土壤中Cs-137(89个采样点)和Pu239+240(76个采样点)的空间分布。在Dolon村发现了污染的基本指数下降：污染减少一半的距离约为0.87-1.25公里(从假定的放射性示踪中心线向西北-东南方向)。这一事实与Dolon附近现有的曝光率测量(1949年9月档案数据)是一致的：根据几项测量，估计痕迹的图案包括一条最大曝光率为2公里的狭窄走廊。为了将计算的空气中的外部剂量与通过回溯发光剂量法(RLD)估计的当地剂量进行比较，考虑了村子内放射性土壤污染的梯度。与轨迹中心轴相关的计算剂量被发现等于2260mGy值(根据档案曝光率数据计算)。RLD采样点附近(村东南)的局部剂量范围为466~780mGy值(平均值：645+/-70mGy值)，与RLD值(平均值为460+/-92mGy值，范围380~618mGy值)相当。将聚落中计算的平均剂量与电子顺磁共振牙釉质剂量估算的剂量进行比较，可以估计Dolon村居民剂量减少的“屏蔽和行为”因素的“上限”，发现为0.28+/-0.068。
Spatial distributions of soil contamination by Cs-137 (89 sampling points) and Pu239+240 (76 points) near and within Dolon village were analyzed. An essential exponential decrease of contamination was found in Dolon village: the distance of a half reduction in contamination is about 0.87-1.25 km (in a northwest-southeast direction from the supposed centerline of the radioactive trace). This fact is in agreement with the available exposure rate measurements near Dolon (September 1949 archive data): on the basis of a few measurements the pattern of the trace was estimated to comprise a narrow 2 km corridor of maximum exposure rate. To compare computed external doses in air with local dose estimates by retrospective luminescence dosimetry (RLD) the gradient of radioactive soil contamination within the village was accounted for. The computed dose associated with the central axis of the trace was found to be equal to 2260 mGy (calculations based on archive exposure rate data). Local doses near the RLD sampling points (southeast of the village) were calculated to be in the range 466-780 mGy (averaged value: 645+/ -70 mGy), which is comparable with RLD data (averaged value 460+/-92 mGy with range 380-618 mGy). A comparison of the computed mean dose in the settlement with dose estimates by ESR tooth enamel dosimetry makes it possible to estimate the "upper level" of the "shielding and behavior" factor in dose reduction for inhabitants of Dolon village which was found to be 0.28+/-0.068.