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長期被ばくのがんリスクは「年間」ではなく「積算(累積)」線量で考える

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Photos: 長期被ばくのがんリスクは「年間」ではなく「積算(累積)」線量で考える

Photos: チェルノブイリ甲状腺癌の地域ごとの年間発症率と I-131 汚染度 Photos: チェルノブイリ甲状腺がんの年齢依存性

近年の代表的な疫学調査より抜粋。赤い四角で囲った部分に注目。

左:自然γ線の小児白血病リスク        右上:テチャ川の乳がん
                       右下:チェルノブイリの小児白血病


※ ラドン濃度の年間平均値で考えるのが慣例になっている「ラドンの肺がんリスク」の疫学のような特例もあり。

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左: Kendall ら,"A record-based case-control study of natural background radiation and the incidence of childhood leukaemia and other cancers in Great Britain during 1980-2006," Leukemia (2013)
  http://www.nature.com/leu/journal/v27/n1/full/leu2012151a.html
右上: Ostroumova ら,"Breast cancer incidence following low-dose rate environmental exposure: Techa River Cohort, 1956-2004," British Journal of Cancer (2008)
  http://www.nature.com/bjc/journal/v99/n11/abs/6604775a.html
右下: Noshchenko ら,"Radiation-induced leukemia among children aged 0-5 years at the time of the Chernobyl accident," International Journal of Cancer (2010)
  http://onlinelibrary.wiley.com/doi/10.1002/ijc.24834/full

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