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香烟暗藏致命放射源：每天一包=一年200次X光胸透
source link: https://tech.sina.com.cn/d/f/2018-10-31/doc-ifxeuwws9764109.shtml
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来源：环球科学ScientificAmerican烟草植株会聚集低浓度的钋210，这种放射性同位素基本上来源于化肥中的天然放射性物质。钋被吸烟者吸入后会聚集在肺部的特定区域，能够引发癌症。单在美国，每年因此死亡的人数就多达数千人。几十年前，
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