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ブレスレットに含まれる放射性物質とその規制
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古田悦子、増田優
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お茶の水女子大学 大学院
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Radioactive materials included in bracelets and the regulations for them
Etsuko FURUTA and Masaru MASUDA
Ochanomizu University Graduate School
Abstract: Recently there are many people wearing bracelets for good luck and/or a healthy effect. In many cases a bracelet made of "minerals" has included in a trace amount of radioactive material. On the other hand there are some bracelets which are added naturally occurring radioactive material (NORM) intentionally. Radioactivity included in some bracelets and some parts of the raw materials was measured by using a HPGe detector and a multichannel analyzer. Furthermore the radiation exposure doses from some of the bracelets were evaluated. The results were deliberated by comparing them to the domestic and/or the foreign regulations in particular the International Commission on Radiological Protection 2007 Recommendations. Some of the radioactivity and radiation exposure doses of the studied bracelets which were made of minerals were not low. It is necessary for the bracelet to note their raw materials. Even if a radiation exposure dose in a case of the normal use of the bracelet was under 1mSv per year (external dose limit for public) the skin equivalent doses might be high when it has been used near on the skin for a long time. It is considered that justification for something adding radioactive material is necessary on the radiation protection. The radioactive materials' intentional addition to the personal ornaments such as bracelets should be prohibited by the international current. Also it is considered that the NORM guideline needs to be revised upward.
Keywords: Bracelet Addition of Naturally Occurring Radioactive material (NORM) The International Commission on Radiological Protection 2007 Recommendations (ICRP2007) Justification
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ブレスレット , 天然放射性物質添加 , 2007年国際放射線防護委員会勧告 , 正当性 , |
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[PDF (253.1K)]
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第7巻 , 第1号 , (pp.19-25)
