Construction of dose estimation model for low dose radiation exposurefor residents living around the Semipalatinsk Nuclear Test Site

塞米巴拉金斯克核试验场周边居民低剂量辐射暴露剂量估算模型的构建

基本信息

批准号：
22404004
负责人：
YAMAMOTO Masayoshi
金额：
$ 10.65万
依托单位：
Kanazawa University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2010
资助国家：
日本
起止时间：
2010 至 2012
项目状态：
已结题

项目摘要

Since 1994, we have concentrated our energies on assessing the radiation dose for human effect and environmental contamination by the nuclear testings at the Semipalatinsk (SNTS) in Kazakhstan. For this purpose, residual long-lived radionuclides such as 137Cs and Pu isotopes have been measured for environmental samples from various areas. At first, works were focused on Dolon village contaminated heavily and external radiation dose for resident was already estimated by detailed soil samplings where were carried out along a line perpendicular to the supposed center of plume of the first atomic bomb (Aug. 1949). In this works, such works were directed to Sarzhal, Karaul and Kainar villages located in the southern direction from the SNTS. Although the obtained data in Sarzhal and Karaul varied largely, overall, peak-like distributions similar to Gaussian function were observed for both 137Cs and 239,240Pu even after about 60 years from atomic bomb. Within the Sarzhal village, being about 5 km away from the center-axis, upper range is 5000-7000 Bq/m^2. Pu is around 2000 Bq/m^2. By using these data, external radiation doses in both villages were successfully estimated. On the other hand, in Kainar, Gaussian-likedistribution was not observed,137Cs inventory was not so high, now its inventory was around 4000 Bq/m^2. The levels are nearly same as Karaul, but somewhat higher sites like hot-spot were in places existing. Now, further works in Kainar are continuing.

自1994年以来，我们将精力集中在评估哈萨克斯坦Semipalatinsk（SNTS）核检测的人类效应和环境污染的辐射剂量上。为此，已经针对来自各个区域的环境样品测量了残留的长寿命放射性核素，例如137C和PU同位素。起初，工作集中在多隆村庄受到严重污染的村庄，居民的外部辐射剂量已经通过详细的土壤采样来估算，该土壤采样沿着垂直于第一个原子弹的羽流中心进行的一条线（1949年8月）进行了估计。在这项工作中，从SNTS的南方方向上，将这些作品引向了Sarzhal，Karaul和Kainar村庄。尽管Sarzhal和Karaul中获得的数据差异很大，但即使在原子弹炸弹距离60年之后，在137Cs和239,240PU中观察到类似于高斯功能的总体峰样分布。在萨尔扎尔村（Sarzhal Village）内，距离中轴约5公里，上范围为5000-7000 bq/m^2。 PU约为2000 bq/m^2。通过使用这些数据，成功估计了两个村庄的外部辐射剂量。另一方面，未观察到高斯轻型纽卡尔的顾问，137cs的库存不是很高，现在其库存约为4000 bq/m^2。这些水平与Karaul几乎相同，但是在存在的地方，例如热点等地点。现在，在海谷的进一步工作仍在继续。