According to the International Atomic Energy Agency, one kilogram of soil typically contains the following amounts of the following three natural radioisotopes 370 Bq 40K (typical range 100–700 Bq), 25 Bq 226Ra (typical range 10–50 Bq), 25 Bq 238U (typical range 10–50 Bq) and 25 Bq 232Th (typical range 7–50 Bq).
Ifølge Det Internationale Atomenergiagentur indeholder et kg jord typisk følgende mængder af tre naturlige radioisotoper 370 Bq 40K (typisk 100-700 Bq), 25 Bq 226Ra (typiske 10-50 Bq), 25 Bq 238U (typisk 10-50 Bq) og 25 Bq 232Th (typisk 7-50 Bq).