RT Journal Article SR Electronic T1 Radioactivity Variations in Cobalt-57 Cyanocobalamin Capsules JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP 128 OP 128 VO 31 IS 1 A1 Silberstein, Edward B. YR 1990 UL http://jnm.snmjournals.org/content/31/1/128.abstract AB