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Construction of the new dosimetry system instead of DS86 according to the joint study with US and analysis of radiation effects

根据与美国的联合研究和辐射效应分析，构建新的剂量测定系统代替DS86

基本信息

批准号：
13480169
负责人：
HOSHI Masaharu
金额：
$ 5.18万
依托单位：
Hiroshima University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

项目摘要

Reevaluation of atomic bomb doses for the survivors in Hiroshima and Nagasaki which was named as "Dosimetry system 1986 (DS86)" have been performed by the effort of US-Japan joint study. Last year in Mach 2003, the senior committee was held in Tokyo and new dosimetry system 2002 (DS02) was approved. There were two major points in this reevaluation study. One was the difference between DS86 and Eu-152 data at long distances (more than 1km). Sometimes the data were 5-10 times larger than DS86 estimation. The other was the difference between the same Eu data and DS86 at the short distance. To the contrary, the Eu-152 data are smaller than the DS86. The long distance problem was solved according to the intercomparison study of Eu-152 and C1-36 using 18 samples, which were stored at Research Institute for Radiation Biology and Medicine, Hiroshima University. The plan was proposed by this head investigator. Conclusion was simple, because the data were reduced and agreed with DS86. The samples used were about 1kg, which were about 10 times heavier than before and ultra low background gamma-ray measurement system in Ogoya of Kanazawa University was used by Dr. Komura. These were much better improvements of the measurements than before. Maybe due to background gamma-ray's contamination in Eu-152 gamma-rays used for measurements, the data reduced. The short distance problem was solved to elevate the explosion height 20m.However, a Nature paper indicating Ni-63 data was published on 31 July 2003 without any permission to US and Japanese working groups. It said that the problem of neutron discrepancy was solved by the Ni-63 measurements, however, it is solved by the intercomparison study and the other information. Both sides sent Nature their addendum in December 2003 and Nature responded in March 2004. We are now waiting results.

在美日联合研究的努力下，对广岛和长崎幸存者的原子弹剂量进行了重新评估，命名为“剂量测定系统1986 （DS86）”。去年2003年3月，在东京召开了高级委员会会议，并批准了2002年新剂量测定系统（DS02）。在这项重新评价研究中有两个主要的观点。其中之一是DS86和Eu-152在长距离（超过1公里）数据上的差异。有时数据比DS86估计大5-10倍。二是同一Eu数据与DS86在近距离下的差异。相反，Eu-152的数据比DS86小。通过对存放在广岛大学辐射生物学与医学研究所的18个样品进行Eu-152和C1-36的比对研究，解决了长距离问题。这个计划是这位首席调查员提出的。结论很简单，因为数据被简化，与DS86一致。高村博士使用的样品约为1kg，比以前重了10倍左右，并使用了金泽大学小古屋的超低本底伽马射线测量系统。这些测量方法比以前有了更好的改进。可能是测量时使用的Eu-152伽马射线受到了背景伽马射线的污染，导致数据减少。解决了距离短的问题，使爆炸高度提升20米。然而，《自然》杂志在2003年7月31日发表了一篇关于Ni-63数据的论文，没有得到美国和日本工作组的许可。说中子差异问题是通过Ni-63的测量解决的，但它是通过相互比较研究和其他信息解决的。双方都在2003年12月向《自然》发送了附录，《自然》在2004年3月做出了回应。我们现在正在等待结果。