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タイトル: 自然放射線被ばく研究を活用したリスクコミュニケーション手法の確立に関する研究
著者: 工藤, ひろみ
著者所属: 弘前大学大学院保健学研究科
発行日: 23-Mar-2017
DOI: https://doi.org/10.1093/rpd/ncv235
キーワード: 被ばく
抄録: On 11 March 2011, a 9.0 magnitude earthquake, which occurred at Northern Japan, and subsequent tsunami caused serious damage to the Fukushima Daiichi Nuclear Power Station (FDNPS). People living within a radius of 30 km evacuated from their homes. Residents at Namie Town stayed at Tsushima district, which was located in the northwest of the FDNPS. As a highly concentrated radioactive plume passed through this area however, the evacuees werevery much worried about their radiation doses and internal exposures. In order to overcome this anxiety, public people should recognize more detailed knowledge about natural radiation exposure. There are several high back ground radiation areas (HBRAs) in the world. Residents living in these areas have been exposed to low dose radiation over a long term. Chapter 1 mainly describes the aim of the present study. The motivation and background as well. Chapter 2 describes the recognition of radiation among general public in Namie Town and Aomori Prefecture (Hirosaki, Aomori and Hachinohe Cities). The survey was carried out using anonymous questionnaires. According to the data analysis, people recognized that they were exposed to natural radiations of more than 1 mSv. However, people in Namie Town thought even radiation of 1 mSv would cause some biological effects. In addition, many people recognized that there would be differences in health effects between artificial and natural radiations, internal and external exposures, respectively. In particular, residents of Namie Town concerned about their own internal exposures by ingestion of food and water. Chapter 3 focuses on internal exposures caused by inhalation of radon and thoron progeny because the internal exposures have not yet been clarified in HBRAs. For their dose assessment, radon, thoron and thoron progeny concentrations were measured by passive monitors over a long period. Consequently, annual effective doses are estimated to be 3.1 ± 2.0 mSv for radon and 2.2 ± 2.5 mSv for thoron respectively. Total dose are estimated to be 5.3 ± 3.5 mSv a-1. The present study has revealed that the radon dose was comparable than the thoron dose, and the total dose was about 2 times higher than the worldwide average. Chapter 4 summarized the present study. The conclusion is obtained as follows: In order to improve radiation risk communication, it is necessary to explain the health risk due to low dose chronic exposure clearly to general public using new scientific findings in HBRAs studies. For instance internal exposures due to inhalation of radon and thoron progeny are unavoidable for general public. It implies that the strategy may be effective for further understanding of radiation risk.
URI: http://hdl.handle.net/10129/6139
テキストバージョン: author
学位授与番号: 11101A067
学位授与年月日: 2017-03-23
学位名: 博士(保健学)
学位授与機関: 弘前大学

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