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§ 192.11 Definitions.
(a) Unless otherwise indicated in this subpart, all terms shall have the same meaning as defined in subpart A.
(b) Land means any surface or subsurface land that is not part of a disposal site and is not covered by an occupiable building.
(c) Working Level (WL) means any combination of short-lived radon decay products in one liter of air that will result in the ultimate emission of alpha particles with a total energy of 130 billion electron volts.