第六讲地理流行病学（接６期）４电离辐射等物理因素：电离辐射尤其是同位素对人类健康的危害性是众所周知的。最明显的例子是日本广岛长崎受原子弹袭击后的９年中，发现白血病患者距爆炸中心越近，发病率越高，１公里内比其他地区高１００倍。１９７９年Ｚｉｇｍａｎ调查... Lecture 6 Geography and Epidemiology (No. 6) 4 Physical Factors such as Ionizing Radiation: The dangers of ionizing radiation, especially isotopes, on human health are well known. The most obvious example is that nine years after being attacked by atomic bombers in Nagasaki, Hiroshima, Japan, the closer the leukemia patients were found to the blast center, the higher the incidence and the 100-fold increase within one kilometer compared with other regions. 1979 Zigman Survey ...