RT Journal Article SR Electronic T1 Effectiveness of Photochromic and Glass Lenses for Radiation Protection in Nuclear Medicine JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP 898 OP 898 VO 20 IS 8 A1 Chilton, Hank A1 Ekstrand, Kenneth YR 1979 UL http://jnm.snmjournals.org/content/20/8/898.1.abstract AB