RT Journal Article SR Electronic T1 Erratum: Method for Optimizing Side Shielding in Positron-Emission Tomographs and for Comparing Detector Materials JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP 971 OP 971 VO 21 IS 10 YR 1980 UL http://jnm.snmjournals.org/content/21/10/971.1.abstract AB