Bsically, here is what I gather: 1. Good Radon detector. However, will this cover any thing that the Geiger counters can. This is may be a question for the Radon Gas detector suppliers. 2. Periodically test yourself for radiation. The only problem is this part of the world, I could not see any doctor who can do it, so I will have to come back to USA (Columbus, Ohio). 3. Wear dust masks to ensure that I do not inhale dust. In case you ever travel to East Africa as a tourist, there is a mountain called Mount Kenya in Kenya and it has lots of these gold nuggests. This country is very safe and regulations are lax. Yu can bring your metal detector with you and detect it. It is legal to take the rough nuggets outside of the country. You can hire guards for $80 - 100 a month and make sure the guard can drive so you do not have to hire a driver. Thank you all for the very informative replies. I am back to the field chasing those yellow nuggests with my Minelab GPX - 4000. -Xasan