RT Journal Article SR Electronic T1 FDA Requested to Clarify Policies on Radiochemicals and Pet Products JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP 142 OP 144 VO 29 IS 2 A1 Carol S. Marcus YR 1988 UL http://jnm.snmjournals.org/content/29/2/142.abstract AB