Evaluation of radiation dose of interventionist to the eyes using small dosimeters attached to the both surfaces of radiation protection glasses

Research Project

Project/Area Number	18K07732
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Review Section	Basic Section 52040:Radiological sciences-related
Research Institution	Teikyo University
Principal Investigator	Hiroshi Kondo 帝京大学, 医学部, 教授 (20324311)
Co-Investigator(Kenkyū-buntansha)	井上政則慶應義塾大学, 医学部(信濃町), 講師 (30338157) 山本真由帝京大学, 医学部, 講師 (30793773) 古井滋帝京大学, 医療技術学部, 教授 (40114631) 清末一路大分大学, 医学部, 准教授 (40264345) 下平政史名古屋市立大学, 医薬学総合研究院(医学), 准教授 (60597821) 五島聡岐阜大学, 医学部附属病院, 准教授 (90402205) 棚橋裕吉岐阜大学, 医学部附属病院, 医員 (40724563)
Project Period (FY)	2018-04-01 – 2021-03-31
Project Status	Completed (Fiscal Year 2020)
Budget Amount *help	¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000) Fiscal Year 2020: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000) Fiscal Year 2019: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000) Fiscal Year 2018: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Keywords	IVR / 放射線 / 被ばく / 水晶体 / 放射線防護 / 防護眼鏡 / 水晶体被曝
Outline of Final Research Achievements	Twenty-five IR physicians nationwide who performed IR wearing radiation protective eyeglasses during the one-year. Personal dosimeters were attached to the outer and inner surfaces of the left lens of the protective glasses and were collected every month to measure the 3-mm dose equivalent (Do) of the outer surface of the lens and the 3-mm dose equivalent (Di) of the inner surface of the lens. The correlations with the 70 μm dose equivalent (Dn) estimated from personal dosimeters distributed separately and worn on the neck were also confirmed. The mean monthly values of Do, Di, and Dn were 0.89, 0.40, and 1.18 mSV, respectively. Do showed a strong correlation with Dn and Di, respectively. 3 doctors (12%) exceeded 20 mSv/year, although there were no doctors whose Do exceeded 50 mSV/year. The IR physicians ’s dose to the eye lens can exceed the equivalent dose limit, particularly when radiation protection glasses, which decrease the exposure dose by about 50%, are not used.
Academic Significance and Societal Importance of the Research Achievements	本研究は，全国25名のIVR医の水晶体被ばくの現状を調査したものである．従来の規定では多くの医師では線量限度を超えることは無かったが，新規定では水晶体防護眼鏡を装着しないと限度を超える医師が存在することが判明した．線量限度を超えることは医師の健康被害をもたらすだけでなく，その医師が医療行為をできなる可能性があり，その場合は国民（患者）にとっての不利益が生じうる．IVR医師は放射線防護眼鏡を装着すれば回避することが示されたことは学術的，社会的にも意義がある研究であると考える．