Gamma rays are high-energy light,
higher-energy even than x-rays. They are
created by nuclear reactions such as fission,
fusion, or radioactive decay. Like any kind of
high-energy radiation (even ultraviolet), they
can alter DNA, which can in turn lead to a variety
of other problems (e.g. cancer). Being as
high-energy as they are, gamma rays are more
dangerous than any other frequency of light,
although there are ways to stop them.
Alpha and beta particles are not light at all.
Alpha particles are helium atoms (two
protons, two neutrons), and beta particles are
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