アブストラクト（50巻suppl号：神奈川歯学）

神奈川歯学

Japanese

Title　： 電子スピン共鳴 (ESR) 法による放射線被曝線量測定の現況
Subtitle　： 総説
Authors　： 李昌一1, 斉田牧子2, 小林杏3, 大塚剛郎4, 小松知子5, 川又亮太6, 櫻井孝6, Ann Barry Flood3, Harold M.Swartz3
Authors（kana）　：
Organization　： 1神奈川歯科大学大学院横須賀・湘南地域災害医療歯科学研究センター, 2神奈川歯科大学大学院咀嚼機能制御補綴学講座, 3The Geisel University School of Medicine at Dartmouth, 4神奈川歯科大学大学院口腔科学講座 矯正学分野, 5神奈川歯科大学大学院口腔科学講座 障害者歯科学分野, 6神奈川歯科大学大学院放射線応用学講座
Journal　： 神奈川歯学
Volume　： 50
Number　： suppl
Page　： 55-60
Year/Month　： 2015 /
Article　： 報告
Publisher　： 神奈川歯科大学学会
Abstract　： 「はじめに」日本は唯一の広島, 長崎に原爆が投下された被曝国である. この背景だけではなく, 2011年に未曾有の東日本大震災の津波災害を受け, 福島第一原子力発電所の事故をおこしてしまう悲惨な経験をした. その際の被曝状況については, 被曝者自身の被曝状況の正確な把握がとても重要である. 先の原爆を含め今回の原子力の事故においてもこれまで行われてきた自然放射線集積線量を電子スピン共鳴(ESR, electron spin resonance, あるいは電子常磁性共鳴EPR, electron paramagneteic resonanceこの稿ではESRに統一する)のESR信号生成を測定することにより, 放射線の被曝線量を求めることが可能であることが知られている. このESRという技術は放射線により生じたラジカル(不対電子)が特定の磁場力を受けると, マイクロ波を吸収し, 共鳴する現象を利用している.
Practice　： 歯科学
Keywords　： 電子スピン共鳴(ESR)法, エナメル質, 放射線被曝線量測定, 原子力災害

English

Title　： Current Status of measurement of radiation exposure by electron spin resonance (ESR) dosimetry
Subtitle　：
Authors　： Masaichi-Chang-il LEE1, Makiko SAITA2, Kyo KOBAYASHI3, Takero OTSUKA4, Tomoko KOMATASU5, Ryota KAWAMATA6, Takashi SAKURAI6, Ann Barry FLOOD3, Harold M.SWARTZ3
Authors（kana）　：
Organization　： 1Yokosuka-Shonan Disaster Health Emergency Research Center, 2Department of Prosthodontics and Oral Rehabilitation, Graduate School of Dentistry, Kanagawa Dental University, 3The Geisel University, School of Medicine at Dartmouth, Department of Oral Science, 4Division of Orthodontology, 5Division of Special Care Dentistry, 6Department of Applied Radiology, Graduate School of Dentistry, Kanagawa Dental University
Journal　： Kanagawa Shigaku
Volume　： 50
Number　： suppl
Page　： 55-60
Year/Month　： 2015 /
Article　： Report
Publisher　： Kanagawa Odontological Society
Abstract　： [Abstract] Japan was only country that atomic bomb was dropped at both Hiroshima and Nagasaki. This is not background only, but also received the tsunami disaster of the unprecedented Great East Japan Earthquake in 2011, it was a miserable experience that would cause the accident at the Fukushima Daiichi nuclear power plant. The accurate understanding of radiation exposure by persons for the exposure situation is very important. The natural radiation integrated dose has also been done up to now in this time of the nuclear accident or atomic bomb by measuring the electron spin resonance (ESR, electron spin resonance or electron paramagnetic resonance EPR, to unify the ESR including electron paramagneteic resonance in this manuscript; ESR) signal generation, it is believed that it is possible to determine the exposure dose of radiation. When the technique of the ESR radicals caused by radiation (unpaired electrons) undergo a certain magnetic field strength, which utilizes a phenomenon that absorbs microwaves resonate. Hydroxyapatite in the enamel that covers the surface of the teeth (Ca10 (PO4) 6 (OH)2) is good crystal structure, yet it is not at all as compared to metabolism of the bone is the same hard tissue. Since the stable radical, which can be considered mainly CO2- into hydroxyapatite by radiation, is generated, the dose measurement has been made as a radiation exposure that received so far by measuring with ESR. Japanese researchers has been actively using this technique, Ikeya (Osaka University), who is a pioneer. In fact, the first time his group was performed for radiation dose measurement of teeth by the Hiroshima and Nagasaki atomic bomb using ESR. Then, South Ural (the former Soviet Union) of radiation workers of first reprocessing plant residents of surrounding Chernobyl nuclear power plant, were used to measure the radiation dose using by ESR technique, such as residents of surrounding Semiparachinkusu nuclear test site. In addition, JCO victims of criticality accident of Japan were also made measured by ESR dosimetry. Also, Iwasaki and Shimano (Ohu University) had also been made various improvements mainly the minimum exposure of radiation in the method of ESR dosimetry. They could be detect 30 mGy, though it would be possibility that we can detect amount of detectable actually 100 mGy. Without making the extraction of teeth is a major drawback in the method of ESR dosimetry, there is a method to be as it is used measuring the person's teeth directly. We could not be practical in the X-band ESR measurement techniques, but Schwartz's group (Gaisei University) has been performed under the L-band ESR equipment, which was development supported by US military. They used nuclear radiation on emergency exposure of the terrorism or nuclear power accident. The boundary around 2 Gy, are immediately that divide the exposed person and requires no survivors in need of treatment, being developed to a level that can be used sufficient to triage, This review focus on an overview of current status of measurement of radiation exposure by electron spin resonance (ESR) dosimetry.
Practice　： Dentistry
Keywords　：