Sandstone with uranium minerals. Entire piece is radioactive. This piece weighs about 6.5 ounces. 25k CPM on Ludlum Model 3 with 44-9 probe.
Sandstone with uranium minerals. Entire piece is radioactive. This piece weighs about 6.5 ounces. 25k CPM on Ludlum Model 3 with 44-9 probe.
