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Model 43-37 Series

Alpha-Beta Gas Proportional Detector

The Models 43-37 and 43-37-1 are large-area gas proportional detectors for alpha and beta survey. Originally designed to be used with the Model 239-1 Floor Monitor, both detectors are compatible with a number of counting instruments.

Specifications

Model	43-37	43-37-1
Part Number	47-1143	47-2243
Detector Type	Large-area gas proportional	Large-area gas proportional
Recommended Counting Gas	P-10 (10% methane, 90% argon). Other counting gases are also acceptable.	P-10 (10% methane, 90% argon). Other counting gases are also acceptable.
Gas Recharge	Expected time of operation on static charge with 1 m (39 in.) cable: Gross counting mode: 15 hours or longer Alpha-Beta mode: 5 hours or longer	Expected time of operation on static charge with 1 m (39 in.) cable: Gross counting mode: 15 hours or longer Alpha-Beta mode: 5 hours or longer
Window	Alpha Only: 0.8 mg/cm² (2 layers of aluminized mylar) Beta-Gamma: 3.4 mg/cm² (1 layer of aluminized mylar and 1 layer of clear mylar) Gamma: 11.8 mg/cm² (1 layer of aluminized mylar and 1 layer of drafting mylar)	Alpha Only: 0.8 mg/cm² (2 layers of aluminized mylar) Beta-Gamma: 3.4 mg/cm² (1 layer of aluminized mylar and 1 layer of clear mylar) Gamma: 11.8 mg/cm² (1 layer of aluminized mylar and 1 layer of drafting mylar)
Window Area	Active: 584 cm² (90.5 in²) Open: 434 cm² (67.3 in²)	Active: 821 cm² (127 in²) Open: 609 cm² (94.4 in²)
Typical Efficiency (4π) - Gross Counting	²³⁹Pu (alpha only): 20% ⁹⁹Tc (beta only): 30% ⁹⁰Sr/⁹⁰Y: 30% Gamma: less than 1%	²³⁹Pu (alpha only): 20% ⁹⁹Tc (beta only): 30% ⁹⁰Sr/⁹⁰Y: 30% Gamma: less than 1%
Typical Efficiency (4π) - Alpha-Beta Counting	²³⁹Pu: 17.5% ⁹⁹Tc: 20% ⁹⁰Sr/⁹⁰Y: 20% Gamma: less than 1%	²³⁹Pu: 17.5% ⁹⁹Tc: 20% ⁹⁰Sr/⁹⁰Y: 20% Gamma: less than 1%
Typical Background	Alpha: Less than 10 cpm when operating at alpha-only plateau region Beta-Gamma: 800 to 1300 cpm (10 µR/hr field)	Alpha: Less than 10 cpm when operating at alpha-only plateau region Beta-Gamma: 1000 to 1800 cpm (10 µR/hr field)
Typical Operating Voltage	Alpha: 1100 to 1400 V Beta-Gamma: 1700 to 1800 V	Alpha: 1100 to 1400 V Beta-Gamma: 1700 to 1800 V
Counter Threshold Setting	Typically 4 mV for scaler or gross counting instrument	Typically 4 mV for scaler or gross counting instrument
Gas Connectors	Double-end quick disconnects	Double-end quick disconnects
Signal Connectors	Series "C", unless specified	Series "C", unless specified
Size (H x W x L)	2.5 x 15.9 x 46.4 cm (1 x 6.25 x 18.25 in.), not including fittings	2.5 x 15.9 x 64.1 cm (1 x 6.25 x 25.25 in.), not including fittings
Weight	1.9 kg (4.1 lb)	2.4 kg (5.4 lb)

Options

Option	Description	Part Number
Model 2750	Gas flow control box	48-2146
2-Stage Gas Regulator	Gas regulator	2310017
Model T-1031	Gas flow time control	48-2472