Invisible radiation that is produced by radioactive materials
There are many different types of radiation. Exposure to ultraviolet, alpha, beta and gamma radiation can cause cancer. Ionising radiation can damage chromosomes and cause mutations that may trigger a tumour to develop. High doses of x-rays should be avoided but they are used to treat cancers because they can also kill tumour cells.
b) Why are sources of alpha particles relatively safe if they are outside the body but very dangerous if they get into the body or onto the skin?
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