Talking about radioisotope techniques in biochemistry, my professor talked about a procedure for detecting the presence of weak beta-emitting isotopes on the desks in labs.
I can't remember in what it consists. I think he said something about spraying a fluor or a scintillation cocktail (mmh, I don't think so).
However, he refered to it as standard procedure, so I guess someone knows the answer.
I'm looking forward to reading your replies.