I get the feeling that you don't know how complicated calculating radiation exposure is. There are plenty of interest in fear mongering against nuclear. Almost all the people talking about how much radiation 300 CPM is have absolutely no idea what they are talking about. Some confuse total measurement units for rates; others are using just the wrong units; still others are talking about levels that are 1000x or 1000000x higher than 300 CPM.
Or to put it another way, 300 CPM (which is a rate) is less than how much radiation you get when on a flight, or how much radiation you get at higher elevations. Even giving a simple explanation of how to calculate Greys (the actual measure you are looking for) takes up the better part of a page. Hell, your bones are radioactive. Yet there are plenty of people posting that somehow the risk to this guy is radioactivity. In reality, his biggest problem is probably going to be finding a new job.
CPM doesn't mean anything, it's useless to compare it to anything without more information.
For his job, depends on the dose he took. In my country he would have been on benefits until the dose was calculated, then if possible, reintegrated in the team, or directed towards a new job if not (paid formation and everything). I've studied with a diver who couldn't work with radioactive trash anymore, he wasn't meant to be a SWE in the end, he now dive for unexploded WW2 stuff in the north sea/Baltic I think
In a way you are right, but in another way you are wrong. Background radiation is mostly gamma which is generally the most dangerous kind. Radiation at a nuclear plant is mostly alpha and beta which are less dangerous at the same CPM rates. So technically you are right, you have to calculate the absorption, but in practice you are wrong because at that rate, there is no way he absorbed enough radiation to be dangerous.
Or to put it another way, 300 CPM (which is a rate) is less than how much radiation you get when on a flight, or how much radiation you get at higher elevations. Even giving a simple explanation of how to calculate Greys (the actual measure you are looking for) takes up the better part of a page. Hell, your bones are radioactive. Yet there are plenty of people posting that somehow the risk to this guy is radioactivity. In reality, his biggest problem is probably going to be finding a new job.