SAMPLE COUNTING SYSTEM

Model # STG-BS44

APPLICATION: Model STG-BS44 is especially well suited for counting Beta emissions from air sampler filters. The STG-BS44 Beta Scintillation System combines a Beta 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 Beta radiation. Stainless steel drawer and base plate for stability and easy cleaning. The sensitivity of the STG-BS44 to Sr90Y90 Beta is typically 80-85% of 2Pi. It is completely insensitive to alphas when used with the Optional Beta filter. 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-BS44

SPECIFICATIONS:

• Photomultiplier Tube: Available with 2'', 3'', or 5'' diameter PM tube. 10-stage.
• Scintillator: Plastic Beta Scintillator, 0.02'' thick.
• Plateau: 200 Volt long.
• Efficiency: Cs¹³⁷ 75% of 2Pi.
  Sr⁹⁰Y⁹⁰ 100% of 2Pi.
  C¹⁴ is 24% of 2Pi.
  Tc99 is 35% of 2Pi.
• Dimensions: 7'' W x 14'' D x 16'' H.
• Weight: 16 lbs.
• Shipping Weight: 28 lbs.
   

Beta Scintillation detector 4'' diameter. The 90cm² face of this probe allows shorter count times plus high sensitivity.


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