Working level

In the context of exposure to Radon and Radon progeny, the historical unit for potential alpha energy concentration, defined as any combination of the short-lived progeny of ²²²Rn or ²²⁰Rn in air that will result in the emission of exactly 1.30 × 108 MeV m^–3 of potential alpha energy, which is approximately equal to 2.08 × 10^–5 J m^–3.

(Adapted from ICRP Publication 126, 2014)

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from ICRP Publication 126, 2014

The historical unit for potential alpha energy concentration defined as any combination of the short-lived progeny of radon in 1 m³ of air that will result in the emission of 1.30 × 10⁸ MeV m^-3 of potential alpha energy which is approximately equal to 2.08 × 10^-5 J m^-3.

from ICRP Publication 115, 2010

Any combination of the short-lived progeny of radon in one litre of air that will result in the emission of 1.3 × 10^{^5} MeV of potential alpha energy. 1 WL = 2.08 × 10^{^-5} J/m³