RT Journal Article SR Electronic T1 Smith’s “Internal Dose Calculation for 99mTc”: An Excellent Paper with Approximate Methods (perspective on “Internal Dose Calculation for 99mTc” J Nucl Med. 1965;6:231–251) JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP 30S OP 41S DO 10.2967/jnumed.120.249938 VO 61 IS Supplement 2 A1 Michael Stabin YR 2020 UL http://jnm.snmjournals.org/content/61/Supplement_2/30S.abstract AB