Radiation harms living cells.
Alpha, beta and gamma radiation enters living cells and collide with molecules.
These collisions cause ionisation which damages and destroys the molecules.
Lower doses cause less damage without killing the cell.
This can sometimes allow mutant cells to divide uncontrollably.
This is cancer.
Higher doses of radiation tend to kill cells which cause radiation sickness.
The extent of how harmful the doseage is depends on two things:
How much expose you have to radiation.
The energy amd penetration of the radiation (some types are more hazardous than others)
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