Residual neutron-induced radionuclides in a soil sample collected in the vicinity of the criticality accident site in Tokai-mura, Japan: A progress report

金沢大学理学部Residual neutron-induced radionuclides were measured in a soil sample collected in the vicinity of the location where a criticality accident occurred (in Tokai-mura, from 30 September to 1 October, 1999). Concentrations of 24Na,140La,122Sb,59Fe,124Sb,46Sc,65Zn,134Cs and 60Co in the soil sample were determined by γ-ray spectrometry, and neutron activation analysis was carried out for selected target elements in the sample. Tentative estimates of the apparent thermal and epithermal neutron fluences which reached the sample were obtained through combined analyses of 59Fe/58Fe,124Sb/123Sb,46Sc/45Sc,65Zn/64Zn,134Cs/133Cs and 60Co/59Co. (C) 2000 Elsevier Science Ltd

Perspective on National Policy for NORM Regulation in Japan

ICRP、IAEAなどの自然放射性物質の規制に関わる安全基準策定における国際的動向と我が国の自然放射線の規制に関する検討状況について述べた。FNCA Workshop on Radioactive Waste Managemen

Present Status of Policy on Clearance System in Japan

原子力施設のクリアランス制度に関わる安全基準策定における国際的動向と我が国の原子力施設と放射線取扱施設に関するクリアランス制度の導入状況と導入に関する検討状況について述べた。また自然放射性物質の規制についても状況の説明を行い、意見交換を行った。アジア地域原子力協力フォーラム(FNCA)原子力施設の廃止措置とクリアランス・タスクグループ討議・調査会

Japanese TENORM Gideline

自然放射性物質の規制に関わる安全基準策定における国際的動向と我が国の自然放射線の規制に関する検討状況について述べた。またクリアランス制度の導入とクリアランスレベルについても状況の説明を行った。アジア地域原子力協力フォーラム(FNCA)原子力施設の廃止措置とクリアランス・タスクグループ討議・調査会

Importance of International Cooperation in Issues of Radiation Safety Regulation

第３７回研究発表

Database of the radioactivity of norm used as industrial raw materials

Most ores used as industrial raw materials are imported mainly because Japan has poor natural resources. The activity concentrations in these materials should be investigated to evaluate the radiation exposure of workers. In this study, imported industrial raw materials were collected, and the activity concentrations in these resources were measured by using inductively coupled plasma mass spectrometry and gamma ray spectrometry. Furthermore, a database of activity concentrations of NORMs was developed by referring to the measured results as well as referring to the literature, and a database on the web was published. The purpose of the database is to relieve anxieties among the general public and to provide extensive data regarding NORM for researchers and regulators. The database provides more than 900 activity concentrations in worldwide NORMs at no fee. (NORM database; http://www.nirs.go.jp/db/anzendb/NORMDB/ENG/index.php)