Originally the thought was to check out those granite slabs we were thinking about putting in the kitchen. Now I have two nice Geiger Counters and a Scintillator. And a better understanding of Radiation and fallout. I think a must for any survivalist is to acquire one and know how to use it. I have been reading anything concerning radiation I can get my hands on, and have a long ways to go. More than a surviving mentality, it's also a cool hobby. You might be surprised to find those rocks in your yard are 2x or 3x background! (or more) I remember in grade school, the Civil Defense drills we had to go through every so often. Go in the hallway and put your head between your knees and all. This was around 1962. The CDV 700 series Civil Defense counters are on E-Bay all the time. Just get one that's been recently calibrated and working. No "passes a battery check", or "seems to be working". You can find a calibrated one for under $100. Preferably a 7006b. The CDV 715's, 717's on up, are high radiation ion chamber meters, and are considered as "doorstops" by many, as you might never use them. I have a 717 as a collector item. It has a 50 ft cord with the probe on the end, so you can take readings from the safety of your bunker. The Civil Defense funding for these Geiger Counters ran out in in 1964, now FEMA and state agencies are dumping them, so they're real cheap. FYI, my PM1703M gamma pager scintillator, is something I take with me everywhere. I live in Alamogordo, NM, and we went to Las Cruces a couple weeks ago. 70 to Cruces crosses White Sands Missile range for several miles. Normal background here is 7-9 uR/hr. As soon as we hit WSMR, it spiked to 57 uR/hr, or about 8x background, for a short distance. No telling what happened out there to cause getting that on the X way, but something sure did. Trinity was at least 50 miles away. If an nuclear event happens, can you tell if it is safe to go outside? If a nuke plant sends up radiation, can you be sure you're not getting any of it down wind? What I've read is fallout is very dangerous the first 24 hours, then gets cut in half each day after. With that you'd have to be hunkered down somewhere for a couple weeks at least. I'm a little more reassured with my Gieger Counter.