Scientific approach of environmental impact of the criticality accident

临界事故环境影响的科学方法

• 批准号: 11800013
• 负责人: KOMURA Kazuhisa
• 金额: --
• 依托单位: Kanazawa University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Special Purpose.
• 财政年份: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11800013/
• 关键词: JCO criticality accident; criticality accident; neutrons; environmental radioactivity; radiation effect; neutron activation; dose; gamma-ray; 核分裂; 中性子フルエンス; 染色体

Environmental impact of the JCO criticality accident was investigated by "Environmental radioactivity research group" and "human effect research group" composed of about 60 members. More than 400 environmental samples (soil, plant leave, chemical reagent, metal, coin, table salt, sugar, stainless steel, fluorescent lamp, gold items etc.) were collected in and around the JCO campus. Concentrations of neutron-induced radionuclides and fission products were measured as a function of distance from the site. Most of the results were reported in "Journal of Environmental Radioactivity, Vol. 50, 2000" as the special issue on Tokai-mura accident. Measurements of long- lived nuclides are still continued in some laboratories. Result of discussion in "The 2_<nd> summer school on environmental radioactivity and radiation" held in June, 2000, was published as "What should be done by nuclear scientists in the case of nuclear accident". Measured values of each sample will be opened as "data base of Tokai- mura accident" with details on sampling map and investigator etc. Results of two research goups have been presented in number of domestic and international symposium.

由约60人组成的“环境放射性研究小组”和“人为影响研究小组”对JCO临界事故的环境影响进行了调查。400多个环境样品（土壤、植物叶子、化学试剂、金属、硬币、食盐、糖、不锈钢、荧光灯、黄金等）都是在JCO校园内和周围收集的测量了中子感生放射性核素和裂变产物的浓度，作为与场地距离的函数。大部分结果发表在东海村核事故特刊《环境放射性杂志》2000年第50卷上。一些实验室仍在继续测量长寿命核素. 2000<nd>年6月举办的“第二届环境放射性与辐射暑期学校”的讨论结果发表为“核科学家在核事故情况下应该做什么”。每个样本的测量值将作为“东海村事故数据库”开放，详细说明采样地图和调查人员等。两个研究小组的结果已在许多国内和国际研讨会上发表。

项目成果

T.Mitsugashira, T.Nakanishi, R.Seki, and S.Kojima: "Estimation of total fission events in the JOC criticality accident by passive γ-ray measurement of ^<140>La in radioequilibrium with precursor ^<140>Ba"Journal of Nuclear and Radiochemical Sciences. 1. 5

T.Mitsugashira、T.Nakanishi、R.Seki 和 S.Kojima：“通过被动 γ 射线测量 ^<140>La 与前体 ^<140>Ba 的放射性平衡来估计 JOC 临界事故中的总裂变事件”核与放射化学科学杂志。 1. 5

小藤久毅: "An estimation of fast neutron flux by ^<35>Cl(n,α) ^<32>P reaction."Journal of Environmental Radioactivity. 50・1,2. 43-48 (2000)

Hisatake Koto：“通过 ^<35>Cl(n,α) ^<32>P 反应估算快中子通量。”环境放射学杂志 50・1,2 (2000)。

T.Matsuzawa, K.Lioka and Y.Kawai: "Gamma dose rate in the vicinity of JCO as of approximately 8 : 00 pm on September 30, 1999"Journal Environmental Radioactivity. 50 (1,2). 27-36 (2000)

T.Matsuzawa、K.Lioka 和 Y.Kawai：“截至 1999 年 9 月 30 日晚上 8:00 左右 JCO 附近的伽马剂量率”《环境放射杂志》。

Y.Murata, T.Muroyama, H.Kofuji, M.Yamamoto and K.Komura: "Neutron-induced radionuclides in soil from the JCO campus by non-destructive γ-ray spectromety"Journal Environmental Radioactivity. 50 (1,2). 69-76 (2000)

Y.Murata、T.Muroyama、H.Kofuji、M.Yamamoto 和 K.Komura：“通过无损 γ 射线光谱法测定 JCO 园区土壤中的中子诱发放射性核素”《环境放射性》杂志 50 (1,2)。 .69-76 (2000)

一政満子: "Tritium, deuterium and gamma-emitting nuclides in plant leaves in the JCO campus."Journal of Environmental Radioactivity. 50・1,2. 145-150 (2000)

Mitsuko Kazumasa：“JCO 园区植物叶子中的氚、氘和伽马发射核素”。《环境放射学杂志》50・1,2（2000 年）。