2.2. Calculations of activity and other radiation indices
2.2.1. Radionuclide activity
Activity (Bq) and activity concentrations (Bq/kg) of primordial
radionuclides were assessed based on their short-lived decay
products assuming that secular equilibrium was attained between
parents and progenies within the period of storage. The nuclide
activity (Bq) were calculated using Eq.(1), as follows: