著者
酒井 一夫
出版者
日本保健物理学会
雑誌
保健物理 : hoken buturi (ISSN:03676110)
巻号頁・発行日
vol.42, no.2, pp.133-134, 2007-06
著者
吉澤 道夫
出版者
日本保健物理学会
雑誌
保健物理 : hoken buturi (ISSN:03676110)
巻号頁・発行日
vol.44, no.1, pp.36-45, 2009-03-01
参考文献数
29

The International Commission on Radiation Units and Measurements, ICRU, has recommended ‘operational quantities’, such as ambient, directional and personal dose equivalent, for external radiation monitoring. Many discussions have been made on the operational quantities, including necessity of these quantities. The operational quantities have a long history, and ICRU published many reports on this issue. This paper reviews the evolution of operational quantities in the relevant ICRU reports and the ICRP 2007 recommendations.
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
小藪 健 永山 誠司
雑誌
保健物理 : hoken buturi (ISSN:03676110)
巻号頁・発行日
vol.38, no.4, pp.294-298, 2003-12-01
著者
木名瀬 栄
出版者
日本保健物理学会
雑誌
保健物理 : hoken buturi (ISSN:03676110)
巻号頁・発行日
vol.38, no.1, pp.24-27, 2003-03

2003年2月5日(水),東京大学工学部11号館講堂において,「新しい放射線防護体系の構築へ向けた最近の話題」と題する会合が開催された。会合は,日本保健物理学会創立40周年記念行事として位置づけられた企画で,我が国の国際放射線防護委員会(ICRP)委員によるICRP委員会における最近の検討状況の紹介,日本保健物理学会や新たに発足した「ICRP等対応委員会」が果たすべき役割についての意見交換を目的としたものであった。年度末という多忙な時期にも関わらず約60名もの参加があり,現在ICRPにおいて議論されている新しい防護体系についての話題を中心に様々な意見が出された。会合は,下記5つの話題についての講演と意見交換会「日本保健物理学会の果たすべき役割」が予定されていたが,時間の制約により意見交換会は十分に行えなかった。1.主委員会の検討状況紹介 2.第1専門委員会の検討状況紹介 3.第2専門委員会の検討状況紹介 4.第3専門委員会の検討状況紹介 5.第4専門委員会の検討状況紹介 以下に,各話題について,概要と所感を記す。会合は,ICRP等対応委員会委員長藤元憲三先生の司会で進められ,日本保健物理学会長中村尚司先生の挨拶により開会された。開会挨拶の中で,中村先生は,学会などからの様々な意見をICRP等へ発信できる体制つくりが必要である旨述べられた。
著者
佐々木 朋三 田代 純利 藤永 英司 石井 友章 軍司 康義
出版者
日本保健物理学会
雑誌
保健物理 : hoken buturi (ISSN:03676110)
巻号頁・発行日
vol.37, no.3, pp.208-221, 2002-09
参考文献数
20
被引用文献数
4 10

The transfer factors (TFs) of uranium (U), thorium (Th), radium (Ra) and lead (Pb) from soil to agricultural products were determined in order to estimate the internal radiation dose to the human body through ingestion. Samples of rice, potato, onion, cabbage, mandarin orange, spinach, apple and soil were collected from various districts in Japan. After appropriate pretreatment of the samples, concentrations in the sample solutions were measured by LCP-MS (for U, Th and Pb) and liquid scintillation counter (for Ra). It was recognized that TFs were 4.9×10^-6 (apple) and 3.6×10^-4 (spinach) for U, 2.8×10^-6 (apple) and 2.3×10^-4 (spinach) for Th, and 4.0×10^-3 (hulled rice), 7.0×10^-5 (onion) and 5.0×10^-3 (hulled rice) for Pb. The TF of Ra, however, was not determined due to detection limitations. TF values obtained in the present study range from the same order of magnitude to 1/100 compared to the data in TRS364 as reported by IAEA. It was revealed that the internal radiation dose caused by the intake of uranium series radioactive nuclides through agricultural food ingestion was 16 μSv/y, where Pb was the most contributory nuclide.
著者
五代儀 貴 中村 裕二
出版者
日本保健物理学会
雑誌
保健物理 : hoken buturi (ISSN:03676110)
巻号頁・発行日
vol.37, no.2, pp.143-152, 2002-06
参考文献数
9
被引用文献数
3

This survey on daily food intake in the northwestern part (northern Tsugaru area) of Aomori Prefecture was a continuation of a previous survey conducted in the southeastern part (Sanpachi-Kamikita area) and southwestern part (southern Tsugaru area) of the prefecture. The 50 families surveyed were divided into three different groups of primary occupations: fishery worker, farmer, and "other occupations." The average total daily food consumption of the entire survey group was about 2,389 gram/day/person (g/d/p), and showed no significant seasonal variation. The consumption rates of marine, agricultural, and livestock products were around 276, 1,275 and 360 g/d/p, respectively, and were relatively constant the year around. However, the consumption rate of other products was 478 g/d/p and was slightly higher in the summer and lower in the winter. The proportions of marine, agricultural, and livestock products in total food consumption among all families were on the average approximately 12, 53, and 15%, respectively. The highest average daily food consumption recorded was 2,510 g/d/p and occurred in fishery workers' families, followed by 2,441 and 2,008 g/d/p in farming and other workers' families, respectively. The families of fishery workers showed the highest consumption of marine products among all families. The consumption of agricultural and livestock products was remarkably high in farmers' families and low in other workers' families. The foods with the highest consumption rates in the northern Tsugaru area were: (a) squid, salmon, wakame, and cod among marine products, (b) rice, radish, apple, cucumber, tomato, and tofu (soybean curd) among agricultural products, and (c) milk, egg, and pork among livestock products. Some slight but statistically significant differences were recognized in the consumption patterns in the northern Tsugaru area in comparison with those of the Sanpachi-Kamikita area and the southern Tsugaru area.
著者
山田 純也 岡 光昭 平尾 茂一 後藤 真佳
出版者
日本保健物理学会
雑誌
保健物理 : hoken buturi (ISSN:03676110)
巻号頁・発行日
vol.43, no.1, pp.10-13, 2008-03

NRE VIIIは2007年10月7〜12日の6日間,ブラジルの,リオ・デ・ジャネイロ近郊のブジオスという海岸の美しい町で開催された。ブジオスは,リオ・デ・ジャネイロの中心地から180kmほど離れた,大西洋に突き出た半島に位置する。NREの歴史を振り返ると1963年にアメリカ,ヒューストンで第1回大会が開催され,続けてアメリカで2回,ポルトガル,オーストリア,カナダ,ギリシャでそれぞれ1回ずつ,不定期的に開催されてきた。今大会は,欧米以外での初の開催となった。日本およびアジア地域での開催が望まれる。日本からは,京都大学,日本原子力研究開発機構,首都大学東京,中央医療技術専門学校,名古屋大学,藤田保健衛生大学,放射線医学総合研究所,琉球大学からの参加があった。今大会の発表は,基調講演が13講演,Oral発表,ポスター発表がそれぞれ51,127件行われた。NRE VIIIの話題を以下に示す。