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GN1490 Specifications

Mica Window Halogen-Quenched
α,β,γ Geiger-Mueller Tube

Electrical Characteristics

Recommended Operating Voltage (volts)500
Operating Voltage Range (volts)450-600
Maximum Dead Time (μs)40
Maximum Plateau Slope (%/100 volts)6
Minimum Anode Resistor (MΩ)3.3
Recommended Anode Resistor (MΩ)4.7
Gamma Sensitivity Cs137 (cps/mR/hr)25
Max. Background Shielded 50mmPb+3mmAl (cpm)8
Tube Capacitance (pF)5

Mechanical Characteristics

Nominal Active Length (inch/mm).37 / 9.4
Window Thickness (mg/cm2)1.6 - 2.0 Mica
Active Diameter (inch/mm)1.12 / 28.4
Cathode MaterialCr - Fe
Cathode Wall Thickness (inch/mm)0.065 / 1.65
Operating Temperature Range (°C)-40 to 75
Fill GasNe/Ar+ Halogen
Type of ConnectorPost
Approx. Weight (grams)33
Maximum Altitude (ft)5000

Equivalent models: N1004 , ZP1490

Global Nucleonics has the design and engineering capability to produce detectors to your specifications.

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