Geiger-Mueller GMS-20

Geiger - Muller cylindrical SBM20

Also, this product can be referred to: SBM - 20 SBM 20, sbm20, sbm 20, sbm20.

 

SBM20 counter  Geiger - Muller cylinder for registration of the hard beta - and gamma - radiation in electronic devices.

 

Geiger - Muller GMS - 20 is widely used in radiation monitoring, icing sensors, smoke, as well as in flaw detection.

 

Also on zapadpribor site. com presents similar counters .

 

Specifications SBM20:

 

Operating voltage - 400 V.

Sensitivity - 60 counts / mR and 75 pulses / mR.

Sensitivity scatter - not more than ± 20% .

 

The range of doses recorded capacity exponential gamma - radiation - from 0 and 004 mR / sec to 40 mR / sec.

Energy product registration counter SBM - 20:

- gamma - quantums - 0, 05 MeV to 3 MeV;

- beta - particles - not less than 0, 3 MeV.

 

The length of the plateau of the counting characteristics - at least 100 V.

Voltage start counting - from 260 V to 320 V.

The slope plateau counting response - 0, 1% / B.

 

The dosimetric characteristics of SBM - 20:

- maximum count rate (N max ) - 4000 pulses / sec;

- natural background level (N p ) - 60 pulses / min.

The counting rate at a power of 4 to ∙ mR - 1 from the source 137 Cs - 240 cpm ∙ from - 1 to 280 pulses with ∙ - 1 .

 

Operating mode - current and pulse.

Material of cathode products Geiger SBM20 - stainless steel.

Minimum dead time at 400 - 190 microseconds.

 

The area of the working area - 8 cm 2 .

Filling cylinder - Ne + Br 2 + Ar.

The amplitude of the pulse - no less than 50 V.

 

Output capacity - not more than 10, 5 pF.

Insulation resistance - 100 MW.

The service life (number of pulses) products counters GMS - 20 - at least 2 ∙ 10 10 .

 

Dimensions:

- diameter - no more than 11 mm;

- length - no more than 108 mm.

Weight - no more than '10

 

Operating conditions SBM20:

 

Ambient temperature - from - 60 ° C to + 70 ° C.

Permissible temperature at which operation is possible for not more than 125 h - + 85 ° C.

- UHL.

 

SBM - 20 radiation meter (GMS - 20 tube) is used for radiation control at nuclear industry facilities, scientific and educational institutions, civil defense, medicine, and even life.

 

Geiger GMS - 20 is formed as a thin - walled hermetic corrugated metal tube. By axis GMS - 20 Geiger - Muller tensioned fine wire, and it is located coaxially with the metal cylinder. And tube and wire electrodes are: Tube - cathode and wire - plate. When injected into the detector GMS - 20 charged particles, some of the gas is ionized, and under the influence of a voltage between the cathode and the anode, electrons and ions begin to move - peak current arises in the tube. on the tube anode voltage is temporarily lowered - we get an inverted pulse.

 

Radiation detector GMS - 20 has a relatively low accuracy of measurement indicators ionizing radiation, but sufficient to determine exceeding the permissible radiation dose for a human. Also SBM20 sensor (SBM20) is used in many household dosimeters.