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


Examples:

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.


Reference

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

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