Science/Engineering/Technical forums

Since the data on these NOS Russian tubes got scattered all over, I thought I'd collect it here. Nothing new AFAIK. Still looking for some of the datasheets that were posted as images or pdf, as our search can't get inside those. This is just to make it all easy to find in the search later. I included some links to the ebay listings I copied these from verbatim, which seem to be sticking around up in the cloud. If anyone has more data on any Russian neutron detector tubes, please add to this thread. It's interesting that the little CHM-9 takes more volts than some of its bigger brothers. Perhaps the gas fill is different?


http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... AUS%3A1123

3He SNM-17
NEUTRON counters operate in the mode of a stable corona discharge application which allows you to:
- Get the counting plateau characteristics of the length of several hundred volts;
- To obtain the amplitude of the signal to hundreds of millivolts;
- To operate the counters on the background of gamma radiation up to 1000 rengen per hour.


GENERAL SPECIFICATIONS

Detects slow neutrons (gamma) radiation

Cathode is made of steel, filling is mix of helium-3 with 3% argons
Range of operating voltage (volts) 2600
Initial voltage of corona discharge (volts) 2000
Plateau length (volts) 400
Plateau Slope (%/100 volts) 0.03
Background corona discharge current (mkA, no more) 25
Own background (c-1, no more) 0.83
Maximum Length (mm) 228
Maximum Diameter (mm) 18

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http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... SS:US:1123

SNM-11 B10


NEUTRON counters operate in the mode of a stable corona discharge application which allows you to:
- Get the counting plateau characteristics of the length of several hundred volts;
- To obtain the amplitude of the signal to hundreds of millivolts;
- To operate the counters on the background of gamma radiation up to 1000 rengen per hour.


GENERAL SPECIFICATIONS

Detects slow neutrons (gamma) radiation

Cathode is made of steel, covered with a layer of boron
Range of operating voltage (volts) 1000
Initial voltage of corona discharge (volts) 700
Plateau length (volts) 200
Plateau Slope (%/100 volts) 0.015
Background corona discharge current (mkA, no more) 27.5
Own background (c-1, no more) 0.017
Maximum Length (mm) 336
Maximum Diameter (mm) 18

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SNM 14

http://cgi.ebay.com/ws/eBayISAPI.dll?Vi ... SS:US:1123


NEUTRON counters operate in the mode of a stable corona discharge application which allows you to:
- Get the counting plateau characteristics of the length of several hundred volts;
- To obtain the amplitude of the signal to hundreds of millivolts;
- To operate the counters on the background of gamma radiation up to 1000 rengen per hour.


GENERAL SPECIFICATIONS

Detects slow neutrons (gamma) radiation

Cathode is made of steel, covered with a layer of boron
Range of operating voltage (volts) 1400-1600
Initial voltage of corona discharge (volts) 700
Plateau length (volts) 100
Plateau Slope (%/100 volts) 0.05
Background corona discharge current (mkA, no more) 27.5
Own background (c-1, no more) 0.017
Maximum Length (mm) 153
Maximum Diameter (mm) 18

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SNM-9
Russian Geiger NEUTRON Counter SNM-9

New, old stock.
Lot of 1 in box
Operating Voltage - 1300 V
Slop of plateau, % per 100 V - ≤7
Neutron sensitivity, pulses per neutron / cm2 - 0.06
Peak gamma background level , r/h - 100
Natural counter background, cpm - ≤ 1
Plateau Length more than 300V
Inclination less than 0.05%/V
Temperature range , 0C - -50... +50
Diameter - 18 mm
Length - 130 mm

Data table:

viewtopic.php?f=11&t=358&p=2150#p2150

Thanks Chris! I'm re-posting them here as well - redundancy is sometimes good.

Thanks Doug & Chris- useful

Here's the datasheet on the tube we're using in Standard counter (these are really good, keep a lookout for more of them please). FWIW, we are running them at about 416v, with 4.7 meg series resistor, and a 1 meg from the main grid to the electrode pictured as a grid on their data, but which is actually just the outermost ring of the anode.
Also for what it's worth, when I used a too-small 1 meg supply resistor, they lit up - and there's neon in the tube fill, very pretty (but very bad for the tube).