1 0 0 0 OA 放射性物質を有するアスベスト含有廃棄物を対象としたクリアランスレベルの評価
- 著者
- 島田 太郎 根本 宏美 武田 聖司
- 出版者
- 日本保健物理学会
- 雑誌
- 保健物理 (ISSN:03676110)
- 巻号頁・発行日
- vol.57, no.1, pp.5-29, 2022-03-31 (Released:2022-05-26)
- 参考文献数
- 37
Of the asbestos-containing wastes arising from the dismantling activities of nuclear facilities, those with radioactive concentrations that do not need to be treated as radioactive materials will be cleared from the nuclear regulatory control. Those will be disposed of or recycled as specially controlled industrial waste based on the Waste Management and Public Cleansing Act. The authors constructed evaluation scenarios according to the treatment manual for asbestos-containing wastes, and evaluated radioactive concentrations (clearance level) of 33 radionuclides corresponding to the public exposure dose of asbestos waste of 10 μSv/y. As a result, the evaluated concentration values were equal to or higher than the current clearance level. It was confirmed that the current clearance level could be applied for asbestos-containing wastes.
1 0 0 0 OA カナダ原子力公社ホワイトシェル研究所
- 著者
- 福井 正美
- 出版者
- 日本保健物理学会
- 雑誌
- 保健物理 (ISSN:03676110)
- 巻号頁・発行日
- vol.18, no.4, pp.425-430, 1983
1 0 0 0 OA 若手研究会勉強会報告「眼の水晶体の等価線量限度の変更に伴う放射線防護の課題」
- 著者
- 小川 真澄 熊谷 敦史 青野 茂昭 葛巻 和枝 立崎 英夫 山下 俊一
- 出版者
- 日本保健物理学会
- 雑誌
- 保健物理 (ISSN:03676110)
- 巻号頁・発行日
- vol.56, no.3, pp.145-152, 2021-10-12 (Released:2022-01-06)
- 参考文献数
- 18
Since the end of 2019, we have faced a COVID-19 (coronavirus disease 2019) pandemic with SARS-CoV-2 (severe acute respiratory syndrome coronavirus 2). Medical institutions must treat COVID-19 patients while preventing health care workers and other patients from nosocomial infections. COVID-19 also needs to be considered in a case of radiation emergency medicine. Although radioactive materials (RI) and SARS-CoV-2 are different, they have much in common in health risk management when we receive such patients in that they are undetectable by all our five senses and require personal protective equipment (PPE). On the other hand, there are some notable points on preparedness and response for their risk management. We cannot detect SARS-CoV-2 in real-time but can sterilize them with alcohol-based hand sanitizer. RI is difficult to be decontaminated entirely but detectable in real-time with a suitable radiation survey instrument. Under the COVID-19 situation, it is a great challenge to deal simultaneously with a radiation protection and an infection control, especially in an emergency situation of radiation exposure. In order to overcome such difficulty, we at first compare the similarity and difference of risk management between RI exposure and SARS-CoV-2 infection. Then the points of attention are introduced how to manage the radio-contaminated patients with a coexistence of SARS-CoV-2, including the fundamental concept of zoning, PPE, and hand-over of equipment.
1 0 0 0 OA PWRプラントにおける線源低減のための亜鉛注入技術の適用について
- 著者
- 永田 暢秋 和田 弘 門井 英一 谷口 和史 渡辺 義史 生駒 英也 仙波 毅 浜口 俊明
- 出版者
- 日本保健物理学会
- 雑誌
- 保健物理 (ISSN:03676110)
- 巻号頁・発行日
- vol.45, no.1, pp.57-64, 2010 (Released:2011-02-04)
- 参考文献数
- 7
The zinc injection technique has been applied to many PWRs (Pressurized Water Reactors) around the world as one of the most effective countermeasures against a radiation source reduction. More than 10 years have passed since the first application of the zinc injection technique mainly in Europe and the US, and its dose reduction effect has been confirmed in each nuclear power plant. The Japan Atomic Power Company has applied the zinc injection technique to Tsuruga nuclear power plant unit 2 (PWR, 1,160 MWe, Commercial operation started in 1987) since 2005. Zinc concentration in primary coolant had been controlled around 5ppb by not more than 10 ppb. Dose equivalent rates on primary equipment and pipes were reduced about 20-30% after zinc injection. Although the dose reduction effect of 20-30% is included the various factors, it was estimated that the effect of about 10% is due to the zinc injection technique. There were no negative effects caused by the zinc injection for the plant operation, water chemistry and fuel integrity in the case of Tsuruga unit 2.
1 0 0 0 原子力発電所周辺に栽植したムラサキツユクサの突然変異率の変動
- 著者
- 山口 彦之 吉田 芳和 田野 茂光 備後 一義 片桐 浩
- 出版者
- 日本保健物理学会
- 雑誌
- 保健物理 (ISSN:03676110)
- 巻号頁・発行日
- vol.20, no.4, pp.349-356, 1985
<i>Tradescantia</i> (clone KU-7) were grown at three points near a site of nuclear power plants and somatic mutation frequencies in <i>Tradescantia</i> stamen hairs were investigated for three years. The two points are located in the prevailing down-wind sector of the site. Mutational events in stamen hair cells were scored every day from the end of April to October for three years. In parallel with this observation, factors which have been thought to affect mutation induction, such as temperature, humidity, insolation, pollutants, radioactivity in the buds were measured at the three points. The daily exposure and radioactive concentration at three points due to the amount of the radioactive nuclide released from the nuclear power plant were calculated.<br>Mutation frequencies fluctuated daily, but they were estimated rather constant on average at three sites. Increase of radioactivities in the buds or other plant tissues was not detected during this experiment. The daily exposure and radioactive concentration were very low, for example, the ratio of the maximum daily exposure to the doubling dose was less than 1×10<sup>-7</sup>.<br>It has been definitely shown by this field experiment that radionuclide released from the nuclear power plants can not induce significant mutation of <i>Tradescantia</i>.<br>It was concluded that <i>Tradescantia</i> stamen hair system was not appropriate to monitor the environmental radiation from the power reactor.
1 0 0 0 低線量の遺伝効果研究におけるムラサキツユクサの利用
- 著者
- 山下 淳
- 出版者
- 日本保健物理学会
- 雑誌
- 保健物理 (ISSN:03676110)
- 巻号頁・発行日
- vol.11, no.4, pp.263-274, 1976
- 被引用文献数
- 2
<i>Tradescantia</i> in studies on genetic effects of low level radiation is briefly introduced. Radiosensitivity, method of screening stamen hair mutation, materials in current uses, spontaneous mutation rate, and modifying factors are refered. For stamen hair mutation b values in exponential model were lower in irradiation with low dose rate and at high environmental temperature. The dose response curves under these modifying conditions, when extrapolated to low dose range, well fit to the line which was obtained by Sparrow's experiment of low level irradiation. In chronic irradiation, the frequency of stamen hair mutation reaches to the constant value after 17 days from the start of irradiation, and is as much as 4 times higher than the peak value in one day irradiation at the same exposure rate. The spontaneous mutation rate of KU-7 varied with temperature. The increase with 1°C increment of mean temperature was -0.04%. Uses of <i>Tradescantia</i> in monitoring the environmental radiation is discussed.
1 0 0 0 日本保健物理学会第53回研究発表会印象記
1 0 0 0 OA 妊娠作業者・胚・胎児の放射線防護: ICRP勧告の変遷と現在の課題
- 著者
- 浜田 信行
- 出版者
- 日本保健物理学会
- 雑誌
- 保健物理 (ISSN:03676110)
- 巻号頁・発行日
- vol.52, no.3, pp.159-166, 2017 (Released:2017-11-15)
- 参考文献数
- 27
- 被引用文献数
- 1 1
In its latest basic recommendations issued in 2007, the International Commission on Radiological Protection (ICRP) recommends that the working conditions of a pregnant worker, after declaration of pregnancy, be such as to ensure that the additional dose to the embryo and fetus would not exceed about 1 mSv during the remainder of the pregnancy, where exposures of the embryo and fetus of pregnant workers are considered and regulated as public exposures. However, it remains unclear, e.g., [1] whether such recommended additional dose of about 1 mSv to the embryo and fetus is the whole body equivalent dose or the effective dose, [2] if the latter, how to compute the effective dose while the currently recommended tissue weighting factors (wT) do not include the stochastic risks of in utero exposures and while the unavailability of the current epidemiological data sets does not allow computation of detriment for in utero exposures, and [3] whether the embryo and fetus are the public. This paper briefly reviews historical changes in ICRP recommendations on protection of pregnant workers, embryo and fetus, and then discusses pertinent issues behind the 2007 recommendations.
1 0 0 0 OA 放射性物質の大気拡散評価
1 0 0 0 OA ドイツ重イオン研究所滞在記(第1部:和文情報)
- 著者
- 津田 修一
- 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.137-139, 2007-06
1 0 0 0 保健物理学と原子力防災
- 著者
- 小出 裕章
- 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.35, no.1, pp.36-38, 2000-03
1 0 0 0 「リスクを追究された」菅原努先生のご逝去にあたり
- 著者
- 甲斐 倫明
- 出版者
- 日本保健物理学会
- 雑誌
- 保健物理 (ISSN:03676110)
- 巻号頁・発行日
- vol.45, no.4, pp.311-312, 2010
1 0 0 0 OA 「第3回環境放射能・放射線研究会」参加印象記
- 著者
- 仲宗根 峻也
- 出版者
- 日本保健物理学会
- 雑誌
- 保健物理 (ISSN:03676110)
- 巻号頁・発行日
- vol.54, no.4, pp.231-233, 2019-12-27 (Released:2020-01-31)
1 0 0 0 OA 第5回環境放射能に関する国際会議(ENVIRA2019)への参加報告
1 0 0 0 「第3回環境放射能・放射線研究会」参加印象記
- 著者
- 仲宗根 峻也
- 出版者
- 日本保健物理学会
- 雑誌
- 保健物理 (ISSN:03676110)
- 巻号頁・発行日
- vol.54, no.4, pp.231-233, 2019
1 0 0 0 OA 英国の放射線業務従事者(NRRW)を対象とした最新の疫学調査の概要
- 著者
- 工藤 伸一 西出 朱美 吉本 恵子 古田 裕繁 三枝 新
- 出版者
- 日本保健物理学会
- 雑誌
- 保健物理 (ISSN:03676110)
- 巻号頁・発行日
- vol.54, no.1, pp.29-39, 2019-04-18 (Released:2019-09-03)
- 参考文献数
- 30
In August 2018, the latest analysis of the UK National Registry for Radiation Workers (NRRW 3rd update) has been published. The NRRW studies have been published almost every ten years since the first analysis (1992). The series of NRRW aimed to analyse cancer risk from low dose occupational radiation exposure. This latest analysis is the study using third analysis data and an additional ten years of follow-up information, but did not include additionally dosimetry information. As the set of ten years lag period, only the risks of cancer were analysed, but excluding leukaemia risks owing to its lag period as two years. The same statistical methods were used in the series of NRRW study. This review provides an outline and summary of the key points of NRRW 3rd update. We denote introduction in chapter 1, summary in chapter 2, comparison with previous studies and other studies in chapter 3, discussion about results in chapter 4, meaning and limitation in chapter 5 and conclusion in chapter 6.