Tozour Family's Fluorescent Rocks: Thorite - Kemp Uranium Mine, Cardiff Township, Ontario, Canada, Geiger counter gamma (2D Only) - Plugin - Special page for use of the sView Plugin in Internet Explorer or very old versions of Firefox ESR

Thorite - Kemp Uranium Mine, Cardiff Township, Ontario, Canada, Geiger counter gamma

(2D Only)

Here is a thorite specimen about one inch from a Geiger Counter. The specimen is about 1 1/2 " and seems to be solid thorite. Thorite is thorium uranium silicate, (Th, U)SiO4. Its two radioactive elements give off plenty of alpha, beta and gamma radiation on their way down to lead. This Geiger counter isn't designed to read alpha particles and it was not positioned for reading beta so all radiation described on this page is gamma. The camera caught the meter at almost 0.3 mR/hr (milli-Roentgen per hour ) of gamma radiation but at this low reading the needle fluctuates wildly. The procedure for reading levels below 0.1 mR/hr is to count the clicks. About 330 clicks ( or counts) per minute corresponds to 0.1 mR/hr.