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.

通过美国与日本联合研究的努力，对广岛和长崎的幸存者的原子弹剂量进行了重新评估。去年，在2003年马赫（Mach）的去年，高级委员会在东京举行，新的剂量学系统2002（DS02）被批准。这项重新评估研究中有两个主要要点。一个是长距离（大于1公里）的DS86和EU-152数据之间的差异。有时，数据比DS86估计大5-10倍。另一个是在短距离处相同的欧盟数据和DS86之间的差异。相反，欧盟-152数据小于DS86。根据欧盟-152和C1-36的比较研究，使用18个样本解决了长距离问题，这些样本存储在广岛大学的辐射生物学和医学研究所。该计划是由这位首席调查员提出的。结论很简单，因为数据减少并同意DS86。使用的样品约为1公斤，比以前重约10倍，Komura博士使用了Kanazawa University Ogoya的超低背景伽马射线测量系统。这些测量比以前要好得多。也许是由于背景伽马射线在欧盟-152伽马射线中的污染，用于测量，数据减少了。解决了短距离的问题以提高爆炸高度20m。它说，NI-63测量结果解决了中子差异的问题，但是，它是通过对比研究和其他信息来解决的。双方在2003年12月将大自然发送了他们的附录，自然在2004年3月做出了回应。我们现在正在等待结果。