RT Journal Article SR Electronic T1 NRC Issues Interim Rule on Medical Use of Radionuclides JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP 20A OP 21A VO 31 IS 11 A1 Tilyou, Sarah M. YR 1990 UL http://jnm.snmjournals.org/content/31/11/20A.abstract AB