RT Journal Article SR Electronic T1 Re-Evaluation of Absorbed Fractions for Photons and Electrons in Spheres of Various Sizes JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP 963 OP 963 VO 41 IS 5 YR 2000 UL http://jnm.snmjournals.org/content/41/5/963.3.abstract AB