RT Journal Article SR Electronic T1 The Birth of Nuclear Medicine Instrumentation: Blumgart and Yens, 1925 JF Journal of Nuclear Medicine JO J Nucl Med FD Society of Nuclear Medicine SP 1362 OP 1365 VO 44 IS 8 A1 Patton, Dennis D. YR 2003 UL http://jnm.snmjournals.org/content/44/8/1362.abstract AB In 1925, Hermann Blumgart performed the first diagnostic procedure using radioactive indicators on humans; this first is well recognized. Less well recognized is the fact that Blumgart and his coworker Otto C. Yens, then a medical student, developed the first instrumentation used in a diagnostic procedure involving radioactive indicators. The instrumentation, a modified Wilson cloud chamber, turned out to be the detector most suitable for their purpose. Blumgart also showed remarkable foresight in outlining the requirements both for a satisfactory indicator (tracer) and for a satisfactory detector—requirements that still hold true today. The Blumgart–Yens modified cloud chamber was the birth of nuclear medicine instrumentation.