RT Journal Article SR Electronic T1 Research in the Development of PET Radiopharmaceuticals JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP 44N OP 54N VO 32 IS 4 A1 Michael J. Welch YR 1991 UL http://jnm.snmjournals.org/content/32/4/44N.abstract AB