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。
These radionuclides undergo radioactive decay, by emitting harmful alpha particles, beta particles or gamma rays.
它们在衰变期间会放出对人体有害的粒子粒子或射线。
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