40 CFR 61.21 - Definitions.

§ 61.21 Definitions.
As used in this subpart, all terms not defined here have the meaning given them in the Clean Air Act or subpart A of part 61. The following terms shall have the following specific meanings:
(a) Active mine means an underground uranium mine which is being ventilated to allow workers to enter the mine for any purpose.
(b) Effective dose equivalent means the sum of the products of the absorbed dose and appropriate effectiveness factors. These factors account for differences in biological effectiveness due to the quality of radiation and its distribution in the body of reference man. The unit of the effective dose equivalent is the rem. The method for calculating effective dose equivalent and the definition of reference man are outlined in the International Commission on Radiological Protection's Publication No. 26.
(c) Underground uranium mine means a man-made underground excavation made for the purpose of removing material containing uranium for the principal purpose of recovering uranium.
[54 FR 51694, Dec. 15, 1989, as amended at 65 FR 62151, Oct. 17, 2000]

Title 40 published on 2014-07-01

no entries appear in the Federal Register after this date.

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United States Code
U.S. Code: Title 42 - THE PUBLIC HEALTH AND WELFARE

Title 40 published on 2014-07-01

The following are ALL rules, proposed rules, and notices (chronologically) published in the Federal Register relating to 40 CFR 61 after this date.

  • 2014-07-21; vol. 79 # 139 - Monday, July 21, 2014
    1. 79 FR 42275 - Revisions to National Emission Standards for Radon Emissions From Operating Mill Tailings
      GPO FDSys XML | Text
      ENVIRONMENTAL PROTECTION AGENCY
      Proposed rule; extension of comment period.
      Written comments on the proposed rule published on May 2, 2014 (79 FR 25388) must be received on or before October 29, 2014.
      40 CFR Part 61