Page 695 - Radiation Safety

TOTAL ACTIVITY CONCENTRATION (TAC) FOR ORE

& MINERAL

• In the case of ores and minerals, where radioactive equilibrium is assumed:

• TAC OM (Bq/g) = (14 x Act. U) + (10 x Act. Th)

• Where Act. U and Act. Th are the activity concentrations in Bq/g of any

member of U-238 and Th-232 series respectively.

*OM = Ore & Mineral