RT Journal Article SR Electronic T1 Statistical Artifact in DPA Measurements at Low Count Rates JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP 537 OP 538 VO 31 IS 4 A1 James A. Sorenson YR 1990 UL http://jnm.snmjournals.org/content/31/4/537.abstract AB