Level of Radioactivity Detectible in Various Gemstones with a Geiger Counter

This is not required for students of EPS2


GEMSTONEWEIGHTRADIONUCLIDESDIRECT READINGS
(ct.)PRESENT(cpm)
Green zircon2.2U-238300
Green zircon3.7U-238200
Ekanite3.9U-2385500
Th-232
Blue topaz4.6Sc-4675
(neutron irradiated)
Blue topaz4.7Ta-182110
(neutron irradiated)