I know this is ridiculous and I appreciate everyone's comments thus far. I think this is helping me get my hands around my irrational fear of radioactive substances. I was just wondering if anyone here worries about possible accidental contact/contamination by these radioactive materials not in a work setting. For example, when strolling through the park, is it very unlikely or even possible to encounter something radioactive and become contamintaed? It woyuld be so much easier if you could see contamination........Anyway, part of my self-therapy is to only worry about things the average human being worries about-so any opinions on this matter would be greatly appreciated. Thanks!