R 325.5228 Airborne radioactivity area signs.

Rule 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: CAUTION AIRBORNE RADIOACTIVITY AREA