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Funny you mention that. I remember a guy that had something similar....don't remember the isotope, but he of course had his dosimetry stripped, and he had a designated toilet to urinate in, after which we would have to survey.......

I don't think you would anyway. When we took air samples, it was about 1 cubic meter, and even then sometimes there wasn't much to detect. Sometimes it was a whopper when there were temp inversions, detecting any measurable activity from only the air surrounding the probe wouldn't get anything...

Your GM detector isn't reading the radon. Your Radon daughters of lead, bismuth and polonium doing a manner of beta decays like you say is what you'd read. In Idaho for instance, which has a phenomenal amount of Radon in the winter, the abundance of static electricity on your knees and elbows...

Really Chuck, I'm just joking with anyway, and I haven't really been following the discussion on meters, but if I had one to pick, I'd pick a frisker of one of many variants. Reason being, I'm not as concerned about mR/hr as I am counts per minute. A frisker will give you good all purpose...

Chuck, I appreciate the breakdown on gamma rays, but really, I've been there, done that. As a person that has handled thousands of tagged pieces of radioactive material, packed high level waste while wearing fully body suits and forced air hoods, sluiced resin, deconned nuclear work sites...

His analogy is accurate. When dealing with low or high level radiation sources, although the dose rate is of fairly significant concern, the source is equally, or more important.

Some things are just better not known about. You can spend a career learning about radioactive materials. Besides, you might not want to know how much of it you are exposed to everyday.