Thanks for the demo.

To buy any Ludlum equipment, contact their sales rep. or drct.com. Its much easier if you work for a lab. Like any radiation measuring device, there is some mfg delay on getting them. I did several measurements around the BayArea and so far, nothing significant. I will post more videos later. By the way, just to put some things into perspective, a reading at 7200 ft above sea level near Truckee today 4/17/11 is around 0.4 to 0.5 micro Sv. Much higher than the collected rain water here.

The part with the rain is most likely due to a natural occurrence call radon washout, although there is no way to be sure without the use of gamma spectroscopy