90Sr concentration in cow teeth from South Ural region, Russia, using Monte Carlo simulation.
90Sr concentration in cow teeth from South Ural region, Russia, using Monte Carlo simulation.
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使用蒙特卡罗模拟计算俄罗斯南乌拉尔地区牛牙齿中的 90Sr 浓度。
DOI：
10.1269/jrr.47.a117
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发表时间：
2006
影响因子：
2
通讯作者：
M. Hoshi
中科院分区：
文献类型：
--
作者：
Eldana Tieliewuhan;Kenichi Tanaka;S. Toyoda;Ayumi Kadoma;S. Endo;A. Romanyukha;O. Tarasov;M. Hoshi
本文提出了一种利用蒙特卡罗程序MCNP将成像板(IP)响应转换为不同标准源厚度的~(90)Sr浓度的成像板技术。为了验证该方法仿真计算的有效性，将激电信号的径向分布与实验结果进行了比较。结果是，他们的意见很一致。在俄罗斯南乌拉尔的Mayak设施发生事故后，拟议的方法已经应用于受辐射污染地区的一颗牛牙。从牙齿中制备了两个样品，即1.2+/-0.2 mm厚度的薄样品和作为牙齿的一半的厚样品。利用实验制作的标准源对厚样品的激电响应进行了评估，并乘以修正因子以确定薄样品的激电响应。用MCNP测得厚度为1.2+/-0.2 mm时的变形率为0.83+/-0.08。用这些值估算的~(90)Sr浓度，薄样品为0.11Bq/g，厚样品为0.12Bq/g，两者吻合较好。
The Imaging Plate (IP) technique which uses the Monte Carlo code, MCNP, to convert IP response to 90Sr concentration with varied thickness of the standard source has been proposed in this study. In order to verify the validity of simulation calculation in the proposed method, the radial distribution of IP signal has been compared between calculation and experiment. The result is, they are in good agreement. The proposed method has been applied to a cow tooth from the territory contaminated by radioactivity after the accident in the Mayak facility in the South Ural, Russia. Two samples have been prepared from the tooth, i.e., a thin sample of 1.2+/-0.2 mm in thickness and a thick sample which is a half of the tooth. The IP response has been evaluated for the thick sample using experimentally made standard sources, and multiplied by a modification factor to decide that for the thin sample. The modification factor has been determined with MCNP to be 0.83+/-0.08 for a thickness of 1.2+/-0.2 mm. Using these values, 90Sr concentration has been estimated to be 0.11 Bq/g for the thin sample and 0.12 Bq/g for the thick sample, hence they are in good agreement.