個人装飾品に含まれる放射性物質

DOI DOI Web Site 参考文献16件

書誌事項

タイトル別名
  • Radioactive Materials in Jewelry
  • コジン ソウショクヒン ニ フクマレル ホウシャセイ ブッシツ ホウシャノウ ノウド ト ヒバクセンリョウ ノ ケントウ
  • -Radioactivity of Some Jewelry and Radiation Exposure Dose of the Radioactivity
  • ―放射能濃度と被ばく線量の検討

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抄録

Recently many Japanese wear jewelry as personal ornaments, particularly bracelets. The jewelry is made of gems, jewels, noble metals and so on. Some kinds of jewelry include much amount of radioactive elements more than that of natural range in ores which are in our living-environment. The radioactive concentrations of 25 kinds of jewels and gems, which were easily purchased on a market or through the Internet, were analyzed by HPGe. The bracelet which was made of ceramics showed the highest radioactive concentration and it was estimated as approx. 800 Bq g-1 of 232Th and 140 Bq g-1 of 238U by assuming radioactive equilibrium among the nuclides in the decay series. Moreover, there was a high radioactive concentration gem including 60 Bq g-1 of 232Th and 300 Bq g-1 of 238U. The radioactive materials added in the ceramics should be monazite analyzed by a prompt gamma-ray activation analysis method. Though the ceramics became the object of the NORM management by the concentration, the radioactivity of one bracelet does not exceed 8,000 Bq. So, all these jewelry samples do not have to manage as NORM as consumer products according to the guideline by Japanese government. However, the jewelry's activity by deliberate addition of radioactive materials is deemed to be unjustified exposure, that the ICRP led the consideration. It is considered that the NORM guideline should take in the consideration of ICRP and prohibit the addition of radioactive materials to jewelry.

収録刊行物

  • 保健物理

    保健物理 45 (3), 253-261, 2010

    日本保健物理学会

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