The most damaging radiation are gamma rays and x-rays; energetic alpha rays (streams of helium nuclei) and beta rays (electrons) can also damage cells.
最具破坏力的辐射是伽马射线和X射线；能量强大的阿尔法射线（氦核能量流）和贝塔射线（电子流）也可以破坏细胞组织。
This explains why alpha-emitting atoms are not dangerous outside of the body; the radiation coming from them doesn't even enter the body.
因此体外的阿尔法辐射原子由于无法穿透身体，所以是不危险的。
This explains why alpha-emitting atoms are not dangerous outside of the body; the radiation coming from them doesn't even enter the body.
因此体外的阿尔法辐射原子由于无法穿透身体，所以是不危险的。
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