T.O. 33B-1-1b.The dose limit in any unrestricted area from external radiation sources shall not exceed 2 mrem (0.02mSv) in any one hour. In addition operations shall be conducted such that radiation exposure toindividual members of the public shall not exceed 100 mrem (1 mSv) in a year. It shall be noted thatthe definition does not limit the radiation exposure to a particular rate (such as 2.5 mR/hr), butpermits higher exposure rates PROVIDING that the total quantity of radiation in any unrestrictedarea during any one hour does not exceed 2 mrem (20 mSv) and during any calendar year does notexceed 100 mrem (1 mSv) to any single individual.c.Special consideration must be given to assure that restricted areas are of sufficient size as to precludeadverse impact on adjacent operations. Assure that qualified experts are consulted prior to initiationof operations if in doubt.d.Table 6-25 provides summary data comparing the measured exposure rate with the maximumallowable on time (in minutes per hour) of the radiation source so that the total dose in any one hourdoes not exceed 2 mrem. Table 6-25.Maximum Permissible Dose Rate Versus Hourly Duty Cycle Measured Exposure RateTotal Time X-ray Machine (or Gamma-ray Source) Is(mrem/hr)Operated During a One-Hour Period (minutes)60240330424520617715813912108156205244306-150Change 2
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