. 2022 Oct 3;15(19):6876. doi: 10.3390/ma15196876

Table 1.

Measured radiation quantities and their characterization.

Radiation Quantities	Labeling	Unit	Characteristic
Activity concentration of ²²⁶Ra	A_Ra	Bq/kg	the activity of ²²⁶Ra in 1 kg of the analyzed material, measured as the number of spontaneous nuclear transformations of the ²²⁶Ra radionuclide per second
Activity concentration of ²³²Th	A_Th	Bq/kg	the activity of ²³²Th in 1 kg of the analyzed material, measured as the number of spontaneous nuclear transformations of the ²³²Th radionuclide per second
Activity concentration of ⁴⁰K	A_K	Bq/kg	the activity of ⁴⁰K in 1 kg of the analyzed material, measured as the number of spontaneous nuclear transformations of the ⁴⁰K radionuclide per second