著者
古田 悦子
出版者
Japan Health Physics Society
雑誌
保健物理 : hoken buturi (ISSN:03676110)
巻号頁・発行日
vol.45, no.3, pp.253-261, 2010-09-01

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<sup>-1</sup> of <sup>232</sup>Th and 140 Bq g<sup>-1</sup> of <sup>238</sup>U by assuming radioactive equilibrium among the nuclides in the decay series. Moreover, there was a high radioactive concentration gem including 60 Bq g<sup>-1</sup> of <sup>232</sup>Th and 300 Bq g<sup>-1</sup> of <sup>238</sup>U. 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.
著者
大谷 順子 大杉 卓三
出版者
大阪大学
雑誌
基盤研究(B)
巻号頁・発行日
2008

中央アジアを調査地域として、社会開発の現状と課題の調査をおこなった。人間の安全保障の概念を取り入れ、特に、保健分野、教育分野、災害、ICT(情報通信技術)の利活用促進による社会開発、地域コミュニティ開発とマイクロファイナンスの取り組みについて調査をおこなった。これらは国連ミレニアム開発目標(MDGs)を達成するための課題でもある。本研究は、先行研究である九州大学教育研究プログラム・拠点形成プロジェクト(P & P)アジア総合研究「アジア地域における人間の安全保障の観点による社会開発に関する新たなフレームワークの研究(研究代表:大谷順子)」の成果を踏まえ発展させて調査をおこない、先行研究において調査が困難であった地域を中心に調査を実施した。