RT Journal Article SR Electronic T1 Effects of Varying Geometry on Dose Calibrator Response: Cobalt-57 and Technetium-99m JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP 1478 OP 1483 VO 28 IS 9 A1 Jacqueline M. Calhoun A1 Daniel B. Golas A1 Susan G. Harris YR 1987 UL http://jnm.snmjournals.org/content/28/9/1478.abstract AB