Exemption limit, LL

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The name come for the French Limite de libération (LL). In German is it known as the Befreiungsgrenze and in English the Exemption limit. Exemption limit LL (Bq/g) was previuosly denoted by LE.

See also Authorisation limit, LA, and Liberation Limit


Reference

Radiological Protection Ordinance of 1 January 2018 (RPO) (Swiss)

Exemption limit for the specific activity in Bq / g (LL). [Sources: IAEA, Safety Requirements: Radiation Protection and Safety of Radiation Sources: International Basic Safety Standards, Revision of IAEA Safety Series N ° 115, GOV2011 / 42, 15 Aug. 2011; Table I-2; Brenk System Planning, Calculation of exemption limits and release values ​​for nuclides, for which none Values ​​in the IAEA-BSS are available Final Report, Aachen, 2012.]

Radionuclides, for which the contribution of daughter nuclides in the determination of the LL value is shown in column 9 of the table [2] marked. In the table below, for each radionuclide, for which a daughter nuclide was considered, the last radionuclide the decay chain specified, along with the mother for the calculation of the LL value.

Example: Ra-226 -> Po-214 means that the daughter nuclides of Ra-226 to Po-214 (i.e., Rn-222, Po-218, Pb-214, Bi-214, and Po-214) with the mother to calculate LL.

For H-3 and S-35, which are present in different chemical forms can, the calculation of LL in the report of Brenk with the more pessimistic Dose coefficients for each route of exposure (e.g., for S-35 with in from S-35 org and one from S-35 inorg). The laid down in this way LL values ​​were applied to all chemical forms of radionuclide.

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