"The exposure of hospital patients to radiation from adjacent \ \ patients containing radionuclides should be kept to a practicable minimum. The dose equivalent attributable to this radiation should not exceed 0.5 rem during a single hospital admission. It is considered unlikely that more than one such hospital admission will occur in any one year. "There may be some relatively rare and unusual situations where it would be necessary or highly desirable to send a patient home in spite of his carrying a burden of radioactive material that could result in a dose to other persons in excess of 0.5 rem in one year. Such cases may be permitted, as exceptions provided that: "(1) No person under age 45 shall be permitted to receive a dose in excess of 0.5 rem in a year. "(2) No person over age 45 should be permitted to receive a dose in excess of 5 rems in a year. (3) The circumstances leading to the decision to make an "exception, the evaluation of the exposure conditions and the means of controlling individual exposure shall be documented. "(4) The local health authorities should be notified of the action."