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(24) The Commission recommends that the annual limit for the effective dose equivalent of 0.05 Sv for workers should be applied also to miners exposed to radon and its daughters. From this basic limit secondary limits for the annual intake or exposure for 222Rn, 220Rn and their short-lived daughter mixtures can be derived, taking into account the effective dose factors for these radionuclides given in the previous section. (25) The possible range for the setting of occupational intake and exposure limits for 222Rndaughter mixtures in air, resulting from the different dosimetric and weighting concepts (see Figure 2) is graphically presented in Figure 3 as a function of the unattached fraction& of the total potential a energy of the daughter mixture in the inhaled air. The limit resulting from the mean lung dose (MLD) weighting-concept is approximately 1.5-3 times higher than the limit derived from the regional lung dose (RLD) weighting-concept.

On the ICRP Publication 32 “Limits for Inhalation of Radon Daughters by Workers”