Exemption limit, LE

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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


Exemption levels LEabs calculated using the ingestion dose coefficient eing

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.


Radiological Protection Ordinance of 22 June 1994 (RPO) (Swiss)

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