J.E. Pearson | University of Illinois Archives
From the photo information sheet:
"Prof. J.E. Pearson places a counter bottle on a photomultiplier tube to record the alpha scintillation. The data is used in the study of air pollution."
From RS 11/1/12, Box 4, "General Engineering, ca. 1960-64", N. 598
Scanned from the film negative