RT Journal Article SR Electronic T1 Radiation Protection—Concepts and Trade Offs JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP 397 OP 397 VO 22 IS 4 A1 Croft, Barbara Y. YR 1981 UL http://jnm.snmjournals.org/content/22/4/397.1.abstract AB