1pcs SI-8B Pancake Geiger counter tube. For dosimeter radiometer. Beta Gamma detector. Soviet Geiger Counter. New Old Stock, never used. Tested.

SI-8B (CI-8B) Soviet Geiger Counter.
New Old Stock, never used. Tested.
This device is 100% workable.

Pancake Geiger counter SI8B (СИ8Б - Russian name) sensitive to soft beta and gamma radiation.
SI-8B Geiger Muller counter pancake designed for soft Beta radiation registration.
SI8B is used in dosimeters and radiometers for measurements. 

This devices is tested.

The package includes a counter with a protective aluminum cover and instructions (datasheet).

Technical Characteristics:

Working Voltage: 360-440V

Plateau Inclination: 0.3%/V

Plateau length - at least 80V.

Max. operating current: 18.2 mA

Current Sensitivity - 8µA-15µA

Max. speed of counting: 3400 pulses/sec

Efficiency of logging Beta: 50-85%

Own Background: < 2 Pulses/s

Beta radiation detection efficiency - 50%-85%.

Amplitude of the voltage pulse - at least 20V

Volt-ampere characteristic slope - not more than 1.25%/V.

Counting speed sensitivity: pulses/uR - (350-500).

Slope of the current-voltage characteristic, % / V, not more than: 1.25

Dimensions:

Diametr - 80mm;

Height - 31mm.

Weight - 93g. 

Features of the SI8B counter: it has a large mica window. In fact, the diameter of the window is 65 mm. The mica window area is 33 cm2.

When sending, the geiger counter will be carefully packed.

If you have any questions, please contact me.

If you need more Geiger tubes than this listing, please let me know.