Rep 4
Rep 4 :
An obsolete unit of absorbed radiation dose equal to the absorption of 93 ergs of energy per gram. This is equivalent to 0.93 rad (see above) or 9.3 milligrays (mGy). "Rep" is an acronym for "roentgen equivalent: physical." The definition was made because a dose of 1 rep of beta rays was considered biologically equivalent to a dose of 1 roentgen (see below) of X rays
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