Exemption limit, LE
Exemption limit LE (Bq/kg) or LEabs(Bq)
Exemption limit [reference below, page 96] for specific activity in Bq/kg and exemption limit for absolute activity in Bq. The exemption limits are derived from the effective dose coefficient for ingestion. The ingestion of 1 kg of a substance with a specific activity of LE (i.e. an activity of LEabs) yields a committed effective dose of 10 μSv.
See also Licensing limit, LA
It follows that the quantity LEabs is absolute activity which gives rise to a dose of 10 µSv following ingestion, i.e.
LEabs = 10 µSv / eing(Sv/Bq)
Using the relation, the value of LEabs for a number of radionuclides is given in the table.