What is the rate of exposure in mremsy corresponding to a continuous 2-Mev gamma ray flux of 2,500 cLL's Wlial dose equivalent would be received by a person wlio worked 50 h week throughout the year in such environment? ls the does exceed the regulation 5 remsiy? If yes then how many hours should he work under such environment in order to keep the receiving dose below 5 rems/y?