It’s because they’re required to have exposure as low as reasonably achievable (ALARA). This is actually going away in the US because it’s not actually based on good science. Low amounts of radiation exposure is actually not bad, and it’s not cumulative like it’s normally treated. Even safe levels of radiation exposure must be avoided if possible, even when it increases costs or other hazards.
Video on the change of regulation around ALARA and linear no-threshold (LNT) radiation measurement:
It’s because they’re required to have exposure as low as reasonably achievable (ALARA). This is actually going away in the US because it’s not actually based on good science. Low amounts of radiation exposure is actually not bad, and it’s not cumulative like it’s normally treated. Even safe levels of radiation exposure must be avoided if possible, even when it increases costs or other hazards.
Video on the change of regulation around ALARA and linear no-threshold (LNT) radiation measurement:
https://youtu.be/KT5hYHdelmg
(But also, they’re being exposed frequently. The patient is only once, or a few times.)