Which Is More Dangerous: Alpha, Beta, Or Gamma?
This question is more complex than it seems at first, as radiation can cause damage both from the outside and from inside an organism.
Alpha rays have poor penetration power. They can cause little harm from outside. The outer layer of dead skin in humans, a thick sheet of paper, or a layer of clothes can resist alpha penetration.
（在外面的话，alpha 比较少危害，因为它无法穿透人的皮肤）
However, alpha particles also have the greatest mass, which implies that they have the greatest ionizing power. If an alpha particle somehow gets into the system through inhaling or swallowing, they become the most dangerous.
（如果alpha进入人体，那就变最危险了）
Chances of alpha particles getting inside the system occur only in situations of a nuclear accident or explosion. Once inside, alpha particles can cause maximum damage to the tissues of humans and other living organisms.
Gamma rays have the highest penetration power. A living organism such as a human being exposed to gamma rays faces a high risk of having bone marrow and internal organs damaged.
Gamma rays can pass through a body, damaging tissue and DNA in the process. Scientists consider gamma rays to be the most dangerous form of radiation.
（科学家认为gamma比较危险，因为它可以透过人体）
https://ecotestgroup.com/press/blog/s-difference-alpha-beta-gamma-radiation/
