Tozour Family's Fluorescent Rocks: Uraninite, autunite - Ruggles Mine, Grafton, NH, 10 seconds at about 1 inch from Geiger counter beta slots

Uraninite, autunite - Ruggles Mine, Grafton, NH, 10 seconds at about 1 inch from Geiger counter beta slots

This 10 second sample of clicks recorded from the Geiger counter with the beta slots facing the uraninite with autunite at about one inch shows around 39 counts / 10 sec. or 234 counts / minute.