Simple Instrumentation 
Determines Several 
Simultaneous Radioactivities 
Stepping single-channel analyzer and 5-window instrument solve 
many industrial problems more simply and more economically 
than elaborate multichannel analyzers 
By J. KOHL, R. E. NATHER, 
: Tracerlab, Richmond, California 
Pea : and V. P. GUINN 
Shell Development Company, Emeryville, California 
Relative Counting Rate 
200 
Pulse Height (volts) 
FIG. 1. Standard samples of the three tracers used 
simultaneously in catalyst study gave these gamma 
spectra with 5-window analyzer. Superimposed 
are windows used in simultaneous determinations 
FIG. 2. Five-window analyzer consists of pulse-height 
analyzer, glow-transfer and digital register, patch panel, 
amplifier, and power supplies 
15 
