Ludlum Model 43-93 Alpha-Beta Scintillation Detector

Indicated Use: Simultaneous alpha and beta survey
Detector Type: ZnS(Ag) scintillator adhered to 0.25 mm (0.01 in) thick plastic scintillator
Window: 1.2 mg/cm2 metalized polyester
Window Area: Active: 100 cm2 (15.5 in2)
Open: 88 cm2 (13.6 in2)
Protective Screen: 0.79 mm (0.031 in.) thick, 6.5 mm (0.26 in.) square openings, 88% open
Outer Dimensions: (L x W): 168 x 92 mm (6.6 x 3.6 in.)
Tool-less removal for quick window replacements
Efficiency: (4π) 99Tc: 15%
90Sr/90Y: 20%
239Pu: 20%
Typical Background
(10 µR/hr field) Alpha: 3 cpm or less
Beta: 300 cpm or less
Cross Talk Alpha to Beta: 10% or less
Beta to Alpha: 1% or less
Detector Uniformity: 15% or less from average reading
Gamma Sensitivity: 15 to 20 cpm per µR/hr (137Cs)
Photomultiplier Tube: 29 mm (1.125 in.) diameter
Operating Voltage: typically 500 to 1200 V (1500 V max.)
Temperature Range -20 to 40 °C (-4 to 104 °F)
Connector Series: "C" (others available)
Construction: Aluminum with beige powder coating
Size: (H x W x L) 6.4 x 9.5 x 31 cm (2.5 x 3.8 x 12.3 in.)
Weight: 0.45 kg (1.0 lb)

Internal Use:
Barcode: 18452563
Location: 8C