What is the rate of exposure in mrems/y corresponding to a continuous 1 – MeV gamma ray flux of 2,500 cm-2s-1? What dose equivalent would be received by a person who worked 40 h/week throughout the year in such environment? Is the does exceed the regulation (5 rems/y)? If yes then how many hours should he work under such environment in order to keep the receiving dose below 5 rems/y?