The maximum permissible level of occupational exposure to radiation is ..... Per year -: (A) 5 rad, (B) 2 rad, (C) 10 rad, (D) 50 rad
Answer is A. Park's textbook of preventive and social medicine 23rd edition. * The amount of radiation from outer space and background radiationhas been estimated to be 0.1 rad a year,the additional permissible dose from man made sources should not exceed 5 rad a year.