APPLICATION: Model STGABS44
is especially well suited to counting Alpha & Beta emissions
from air sampler filters.
The STGABS44 Alpha Beta Scintillation System combines Alpha and Beta Dual Scintillation Detector plus TM4 drawer system for sample containment. In this detection system, the protective window and grill are deleted to enhance sensitivity to Alpha and low energy Beta radiation. Stainless steel drawer and base plate for stability and easy cleaning. The sensitivity of the STGABS44 to 5MeV Alphas is typically 8085% of 2 Pi. Alpha Background can be less than one count per minute. Sample cavity is 4 1/16'' diameter x 3/16'' deep. Allows 4'' sample diameter x 3/16'' thick sample size. Windowless operation, with lighttight housing and automatic HV. Cutoff when drawer is opened. SPECIFICATIONS:

Figure 1: STGABS44 
Alpha  Beta  

Photomultiplier Tube:  5'' dia. 10stage.  
Scintillator:  ZnS(Ag).  Plastic Scintillator, 0.02'' thick. 
Plateau:  200 Volt long.  200 Volt long. 
Slope:  Less than 5% per 100V.  
Efficiency:  Greater than 75% of 2 Pi.  Cs^{137} 75% pf 2 Pi.
Sr^{90}Y^{90} 100% of 2 Pi. C^{14} is 24% of 2 Pi. Tc99 is 35% of 2 Pi. 