Hi everybody :D (try no.3 to post this, huh, so I'll be short)! It was great reading your discussions, now I have one question for you, I hope you can help me. I started working in a lab that uses radioligand binding assays routinely. We use tritium labeled steroid hormones. I know that tritium is weak source of radiation (electrons, let's forget anti neutrino here ;)). Thing that happens sometimes (usually during disposal) is that I can feel the odor of scintillating fluid in the air. Radiolabeled hormones are dissolved in that fluid. Inhaling tritium is unsafe if my knowledge is good. But I was told that everything is safe because steroids do not evaporate from solution, only solvent evaporates. It makes sense, but I'm still concerned about it, I'm thinking that there is a chance that some (possibly very small quantity) of steroid hormones can evaporate from solution. And I do not like the notion of inhaling them even if it's few radiolabeled molecules (and that's 2-3 times monthly). I hope that some of you are familiar with this method and it's safety procedures, so you can give me some advice about this. Thanks !