RADIATION PROTECTION ISSUES ASSOCIATED WITH NUCLEAR-MEDICINE OUT-PATIENTS

This paper reviews the published data relating to the radiation hazard s associated with nuclear medicine outpatients. It is discussed both i n the context of the current UK advice as well as potential guidelines following the recommendations in ICRP 60. For diagnostic studies ther e is little need for restrictions. The main exceptions are for a prolo nged journey home by public transport with high levels of Tc-99(m) and for the situation of an outpatient given In-111 who has to look after a fretful infant. The main problem occurs following the administratio n of I-131 therapy for thyrotoxicosis. The principal hazards are assoc iated with external exposure; radiation doses from ingestion due to co ntamination are small. Restrictions should only be necessary for admin istered activities greater than 400 MBq (e.g. public transport, return to work, sleeping with partner). With such restrictions it is conside red that I-131 therapy for thyrotoxicosis can continue to be given on an outpatient basis.