RT Journal Article SR Electronic T1 International Committee for Radionuclide Metrology JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP 1264 OP 1264 VO 19 IS 11 A1 Wilfrid B. Mann YR 1978 UL http://jnm.snmjournals.org/content/19/11/1264.1.abstract AB