Section R. 325.5228 - Airborne radioactivity area signsRule 228.
(1) As used in this rule, "airborne radioactivity area" means a room, enclosure, or operating area in which airborne radioactive material exists in concentrations in excess of the amounts specified in column 1, table I of Rules 261 to 269 or a room, enclosure, or operating area in which airborne radioactive material exists in concentrations which, averaged over the number of hours in any week during which individuals are in the area, exceed 25% of the amounts specified in column 1, table I of Rules 261 to 269.(2) Each airborne radioactivity area shall be conspicuously posted with 1 or more signs bearing the radiation caution symbol and the following words:Mich. Admin. Code R. 325.5228
1979 AC; 2016 MR 10, Eff. 5/25/2016