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DEVELOPMENT OF EXTREMELY LOW-LEVEL NEUTRON BY ACTIVATION METHOD AND ITS APPLICATION TO VARIOUS ENVIRONMENTS.

活化法开发极低能级中子及其在各种环境中的应用。

基本信息

批准号：
13358010
负责人：
KOMURA Kazuhisa
金额：
$ 32.7万
依托单位：
LOW LEVEL RADIOACTIVITY LABORATORY, K-INET, KANAZAWA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
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

(1)Anti-coincidence method by using Plastic Scintillation counter was applied to reduce background counts of the Ge detectors in Ogoya underground laboratory(OUL). Results obtained by fundamental research were presented at the International Conference of Low-Level Radioactivity Measurements Techniques(LLRMT) held 6n Oct.13-17, 2003 at Vienna, Austria.(2)Fundamental parameters for the measurement of low-level neutrons by activation technique were determined under the operation of small reactor of UTR, Kinki(1W).(3)Environmental neutron has been monitored at Rokkasho-mura, Aomori Pref. Results were reported at the International Conf.jel ; d at Maidstone, England Sep.19-26,2002 and published in "Environmental Radiochemical Analysis II".(4)Level of environmental neutron in sea water of the range of 0 to 4m was measured three times at Ogi marine Research Laboratory. Small maximum of thermal neutron flux was observed at 5-10cm depth, which agrees well with theoretical calculation.(5)Neutron flux has been monitored regularly at Tatsunokuchi(35m above sea level) and Shishiku Highland(640m).(6)Separation method of Eu and Ac was developed to detect extremely low-level Eu-152 produced by Atomic Bomb in 1945.(7)Eu-152 measurements of Hiroshima granite samples were reported for the publication of DS02 (Dosimetry System 2002 for the evaluation of radiation dose of Hiroshima and Nagasaki Atomic Bomb in 1945).(8)Results of Co-60 measurement in the spoons exposed to the JCO criticality accident were published in J.E.R.(9)Got prize from Radiation Effect Research Association for the contribution to extremely low-level neutron measurement by activation method.(Mar.2003).

（1）采用塑料闪烁计数器的反符合方法降低了Ogoya地下实验室（OUL）Ge探测器的本底计数。2003年10月6日在奥地利维也纳举行的国际低水平放射性测量技术会议（LLRMT）上介绍了基础研究的结果。（2）在日本东京大学近畿（1 W）小型反应堆运行条件下，确定了活化法测量低能中子的基本参数。（3）在青森县六所村进行了环境中子监测，结果已在2002年9月19 - 26日在英国麦德斯通举行的国际会议上发表，并发表在“环境放射化学分析II”上。（4）在Ogi海洋研究实验室进行了3次0 ~ 4 m海水中环境中子水平的测量。在5- 10 cm深度处观测到热中子注量率的小峰值，与理论计算结果吻合较好。（5）在海拔35米的龙之口和海拔640米的志志久高原进行了中子通量的定期监测。（6）建立了Eu和Ac的分离方法，用于1945年原子弹爆炸产生的极低水平Eu-152的检测。（7）为出版DS 02（用于评估1945年广岛和长崎原子弹辐射剂量的剂量测定系统2002）报告了对广岛花岗岩样品的Eu-152测量结果。（8）JCO临界事故中暴露的勺子中Co-60测量结果已发表在J.E.R.上（9）因在活化法测量极低水平中子方面的贡献而获得辐射效应研究协会奖。（2003年3月）。