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russia:start

tubes.jpg

Above: from top to bottom: SNM-11, SNM-32, SNM-17, SBM-20, SNM-13

An eBay seller indicates these may have been made by “VNIIRT / Soviet Institute for Scientific Radiation Technology Research”

Started making a list I found some pages

http://www.pocketmagic.net/tag/sensitive-geiger-tube/

http://pico.dreamhosters.com/YG/GeigerCounterEnthusiasts-4/41846.html

  • SNM tube summary
  • Has lots of mistakes though…current is actually

Info pullsed from those pages:

Image Name For Fill Oper V Conduct V Background
uA (max)
Resistor
@ Vmax
Notes
tube.jpg
SBM-20
Gamma, beta 400
snm-9.jpg
[eBay Sanutek 311490458155]

SNM-9

CHM-9
Neutron, slow
tube.jpg
SNM-11

CHM-11
Neutron BF3 1500 - 3000 600 - 700 5.27 570 M

SNM-12

CHM-12
Neutron 500 - 700 400+ 11.0 64 M
tube.jpg
SNM-13

CHM-13
Neutron, slow 450 - 600 450+ 5.5 110 M

SNM-14

CHM-14
Neutron 450 - 600 600 - 700 5.27 110 M

SNM-16

CHM-16
Neutron 2000 - 2800 2000+ 25.0 110 M
tube.jpg
SNM-17

CHM-17
Neutron BF3 2000 - 2800 2000+ 25.0 110 M

SNM-18

CHM-18
Neutron, slow 1275 - 1500 ? ? ?

SNM-18.01

CHM-18.01
Neutron 1700 - 3000 1450 - 1650 25.0 68 M

SNM-19N

CHM-19N
Neutron 2000 - 2800 600 - 1750 15.0 190 M
tube.jpg
SNM-32

CHM-32
Neutron, slow He-3 1500 - 3000 600 - 700 25.0 120 M
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SNM-42

CHM-42
Neutron 1500 - 3000 600 - 700 25.0 120 M

Resistor calculation:

  • Don't exceed max corona current
  • Use reccomended voltages
  • Assume tube drop negligible (although its not really)
  • R = V / I type calculation
  • Variable voltage supply: choose R at high voltage so that voltage can be safely varied over entire range

CHM vs SNM: English interpretation of Cyrillic characters gives them “CHM” prefixes. I've been led to believe SNM is more proper although I can't really back that up

GS-PREAMP

Forum post

The SNM tubes can be a bit tricky to get working as the SNR isn't very high compared to GM tubes (like the SBM-20). Bee research says SNR is about 3.

They sell a small preamp board with Schmidt triggers to help filter out noise and instructions on how to use it. If you are looking for a relatively quick start without shelling big bucks for new tubes this is probably a good route to go.

2015-12-12: JM got board for evaluation. Will post more once I try it out


russia/start.txt · Last modified: 2016/01/07 15:50 by spirit532