Candidates can expect competition for most radiation therapist positions. (bls.gov)
To err on the safe side, most radiation protection agencies follow the linear no - threshold model, which posits that risk diminishes with decreasing exposure but that any increase above background poses a cancer risk. (science.sciencemag.org)
If we consider a thin enough layer most radiation will pass right through the layer even at the most absorbant frequencies. (realclimate.org)