Beta and Gamma particles are used as tracers in medicine.
The radioactive isotopes can be swallowed or injected into the body, and their activity inside of the body can be monitoured using a detector. Computers convert the readings of the detector into a display that shows where the strongest reading is coming from.
A common example of this is iodine-131. Its absorbed by the thyroid gland and gives out radiation thats detected to see whether the gland is taking in iodine like it should.
The isotopes that are taken into the body must always be gamma or beta, so that the radiation passes out of the body.
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