§ 215.3. Units of exposure.
As used in this article, the unit of exposure to external X-ray and gamma radiation expressed in standard international (SI) units is the coulomb per kilogram (C/kg) of air. This represents the quotient of dQ by dm where ‘‘dQ’’ is the absolute value of the total charge of the ions of one sign produced in air when all the electrons (negatrons and positrons) liberated by photons in a volume element of air having mass ‘‘dm’’ are completely stopped in air. The ‘‘roentgen’’ is a special unit of exposure. One roentgen is equal to 2.58 x 10-4 coulomb per kilogram of air. One milliroentgen (mR) is equal to 1/1000 roentgen.
Source The provisions of this § 215.3 adopted November 17, 1995, effective November 18, 1995, 25 Pa.B. 5085; amended September 14, 2001, effective September 15, 2001, 31 Pa.B. 5239. Immediately preceding text appears at serial pages (249207) to (249208) and (203799).
Cross References This section cited in 25 Pa. Code § 215.2 (relating to definitions).
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