日本放射線安全管理学会誌
Online ISSN : 1884-9512
Print ISSN : 1347-1503
最新号
選択された号の論文の9件中1~9を表示しています
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原著
  • 石井 浩生, 薩來 康, 上杉 直人, 加藤 槙子, 三戸 麻莉菜, 宮田 恒平, 稲葉 洋平, 千田 浩一
    2018 年 17 巻 1 号 p. 2-8
    発行日: 2018年
    公開日: 2018/05/17
    ジャーナル フリー

     It is important to measure scattered radiation in diagnostic radiology in terms of evaluation of occupational exposure and leakage radiation dose. Recently, Unfors RaySafe (Sweden) released a solid-state survey sensor aimed at expanding RaySafe X2 system. However, there are no detailed reports regarding the performance, which includes energy dependence and angular dependence, of X2 survey meter. The purpose of this study was to evaluate the performance of X2 survey meter. Experiments were conducted to compare the performance of X2 survey meter with that of an ionization chamber survey meter. The results showed that the fundamental performance of X2 survey meter were equal to or superior to that of an ionization chamber survey meter. In addition, X2 survey meter is easy to handle. The study concludes that X2 survey meter has adequate performance for measurement of scattered radiation in diagnostic radiology.

  • 杉浦 広幸, 酒井 創, 渡部 浩司
    2018 年 17 巻 1 号 p. 9-15
    発行日: 2018年
    公開日: 2018/05/17
    ジャーナル フリー

     The current concentrations of radiocesium (137Cs) on upper surface of cherry tree branch barks of the South Tohoku District of Japan are high. In 2017, these concentrations decreased to about half of that in 2014 When the accident at the Chernobyl Nuclear Power Plant occurred, the 137Cs concentrations on cherry tree bark surfaces in the area were on same level as that in the Northern Fukushima Prefecture. This was about 1/100 of the concentration in Fukushima City in 2016. Autoradiography of the cherry tree bark samples obtained from the area revealed weak radioactive spots on the surface of the barks. 137Cs pollution in cherry tree barks in the South Tohoku District is expected to decrease to about 1/100 of the initial concentration after thirty years.

  • 松田 尚樹, 三浦 美和, 林田 りか
    2018 年 17 巻 1 号 p. 16-22
    発行日: 2018年
    公開日: 2018/05/17
    ジャーナル フリー

     The confusion after the Fukushima-Daiichi NPP accident may be attributable in part to the failure of early emergency monitoring by the government. The governmental emergency monitoring measures had been established but did not work for several reasons including destruction of radiation monitoring posts and insufficient preparedness for such a great disaster more than expected. The approved radiation facilities with technical and human resources may have ability to play a role in emergency situations outside their radiation control area, and in fact, emergency environmental sampling, monitoring, and disclosure of the results to the public by the radiation facilities were reported. These experiences indicate the possibility that the emergency monitoring platform by radiation facilities will be organized. To assess this possibility quantitatively, we conducted a current situation survey to the educational radiation facilities about their experience, intention and future considerations regarding the emergency responses. The results demonstrated that more than half of 72 responders had taken various measures after the Fukushima-Daiichi NPP accident such as monitoring to know radiological situation of their environment, however; the information was not shared due to lack of the common framework. Therefore, the 59 facilities out of 72 expressed the intention to join the emergency monitoring platform if it is organized. These results clearly suggest that the organized emergency monitoring platform by educational radiation facilities could be established, as a complemental system from the academia to the public.

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