Certain exposures to radiation can cause cancer. what is the main difference between the use of radiation treatments to treat cancer and exposures that cause cancer?

the radiations that are used to treat cancers are of the gamma type. primarily emitted from cobalt-60 (a radioactive isotope).  and it is more controlled than other radiation exposures. i.e. solar radiation which is not controlled.

hope that this helps.

an active site is a region that is present on an enzyme where the reactants or the substrate molecules we can say bind and experience a chemical reaction. the substrate is basically a reactant whose concentration is changing and that is converting into a product after binding at the active site of an enzyme