文献一覧: 阿部修治 (著者)

12 0 0 0 OA 第五福龍丸に降った放射性物質について

著者: 木村健二郎南英一本田雅健横山祐之池田長生不破敬一郎夏目晴夫石森達二郎佐々木行美酒井均水町邦彦浅田正子阿部修治馬淵久夫鈴木康雄小松一弘中田賢次
出版者: 公益社団法人日本分析化学会
雑誌: 分析化学 (ISSN:05251931)
巻号頁・発行日: vol.3, no.4, pp.335-348, 1954-08-15 (Released:2010-01-14)
参考文献数: 15
被引用文献数: 16 14 13

In order to find the proper method of medical treatment for the afflicted men on board the No.5 Fukuryu Maru on March 1, 1954, it was necessary to know the species and amounts of radioactive elements in the dust of the so-called Bikini Ashes which had fallen on board.At the request of the Hospital of Tokyo University, the authors started analyses on March 18.A combined method of chemical separation with the use of carriers and separation with the use of ion exchange resin was applied;17 nuclides were detected and the results of quantitative estimation of alkaline earth metals were reported on March 31.The main constituent of the ashes was found to be calcium hydroxide and its radioactivity was 0.37mC/g (April 23) which was decayed proportionally to -1.37 power of the time elapsed.The chemical group separation was carried out as shown in Table 3; the second, third(especially rare earth metals)and fifth(alkaline earth metals)analytical groups showed strong radioactivity.By ion exchange method(Fig. 4), the fraction of anions, Zr and Nb fraction, U fraction, the fraction of rare earth metals and the fraction of alkaline earth metals were separated.Furthermore, each constituent of those fractions was estimated quantitatively.In order to confirm the presence of 129mTe, 129Te, 131I, 132I, 103Rn, 106Ru, 106Rh, 95Zr and 95Nb, the chemical method was used.The members of alkaline earth metals, e.g.45Ca, 89Sr, 90Sr, (90Y), 140Ba and (140La), and the members of rare earth metals, e.g.91Y, 141Ce, 143Pr, 144Ce, 144Pr and 147Nd were estimated after the separation with the use of ion exchange resin.The presence of 237U was confirmed from its radioactivity and chemical properties.Also α-tracks of 239Pu.were detected by autoradiograph ic method.Table 6 indicates the summary of the results.

5 0 0 0 OA アスベストとナノファイバ:共通点と相違点

著者: 阿部修治長沢順一
出版者: 一般社団法人日本リスク学会
雑誌: 日本リスク研究学会誌 (ISSN:09155465)
巻号頁・発行日: vol.23, no.4, pp.231-240, 2013 (Released:2014-05-30)
参考文献数: 37
被引用文献数: 1

An overview is presented on the comparison between asbestos and nanofiber from the viewpoint of risk perception. After reviewing various fundamental concepts related to fibers, it is pointed out that asbestos and nanofiber have significant differences in size and structure, although both fall into the category of respirable fiber. The results of hazard evaluation for asbestos and related fibers show significant variability among materials, thus making a simple extrapolation of previous knowledge to nanofiber impossible. Therefore, the risk analysis of various nanofibers, such as carbon nanotubes, needs to be carried out for individual classes with specific size, shape, and other structural characteristics. Towards this end, an increasing number of toxicological studies are indeed under way, especially for carbon nanotubes.