APPLICATION: Model STG-ABS44
is especially well suited to counting Alpha & Beta emissions
from air sampler filters.
The STG-ABS44 Alpha Beta Scintillation System combines Alpha and Beta Dual Scintillation Detector plus TM-4 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 STG-ABS44 to 5MeV Alphas is typically 80-85% 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 light-tight housing and automatic HV. Cutoff when drawer is opened.
Figure 1: STG-ABS44
|Photomultiplier Tube:||5'' dia. 10-stage.|
|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.||Cs137 75% pf 2 Pi.
Sr90Y90 100% of 2 Pi.
C14 is 24% of 2 Pi.
Tc99 is 35% of 2 Pi.