Mcmaster: Created page with "300 px 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 / So..."

2019-03-08T19:07:59Z

Created page with "300 px 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 / So..."

New page

[[File:mcmaster_russia_tubes.jpg|300 px]]

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/]

* Detailed info on lots of tubes
* GM: [http://www.pocketmagic.net/tag/geiger-muller/]
* Sensitive GM: [http://www.pocketmagic.net/tag/sensitive-geiger-tube/]
* Neutron tag?

[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:

{| class="wikitable sortable" border=1
!Image !!Name !!For !!Fill !!Oper V !!Conduct V !!Background uA (max) !!Resistor @ Vmax !!Notes | | | | | | | |
|-
| [[File:mcmaster_russia_sbm-20_tube.jpg|300 px]] || [[russia_sbm-20 | SBM-20]] || Gamma, beta || || 400 || || || || || || || || || || ||
|-
| [[File:ebay_ranutek_311490458155_snm-9.jpg|300 px]] [eBay Sanutek 311490458155] || SNM-9 CHM-9 || Neutron, slow || || || || || || || || || || || || ||
|-
| [[File:mcmaster_russia_snm-11_tube.jpg|300 px]] || [[russia_snm-11 | SNM-11]] CHM-11 || Neutron || BF3 || 1500 - 3000 || 600 - 700 || 5.27 || 570 M || || || || || || || ||
|-
| || [[russia_snm-12 | SNM-12]] CHM-12 || Neutron || || 500 - 700 || 400+ || 11.0 || 64 M || || || || || || || ||
|-
| [[File:mcmaster_russia_snm-13_tube.jpg|300 px]] || [[russia_snm-13 | SNM-13]] CHM-13 || Neutron, slow || || 450 - 600 || 450+ || 5.5 || 110 M || || || || || || || ||
|-
| || [[russia_snm-14 | SNM-14]] CHM-14 || || || || || || || || Neutron || || 450 - 600 || 600 - 700 || 5.27 || 110 M ||
|-
| || [[russia_snm-16 | SNM-16]] CHM-16 || || || || || Neutron || || 2000 - 2800 || 2000+ || 25.0 || 110 M || || || ||
|-
| [[File:mcmaster_russia_snm-17_tube.jpg|300 px]] || [[russia_snm-17 | SNM-17]] CHM-17 || || || || || Neutron || BF3 || 2000 - 2800 || 2000+ || 25.0 || 110 M || || || ||
|-
| || [[russia_snm-18 | 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 || || || || || || || ||
|-
| [[File:mcmaster_russia_snm-32_tube.jpg|300 px]] || [[russia_snm-32 | SNM-32]] CHM-32 || Neutron, slow || He-3 || 1500 - 3000 || 600 - 700 || 25.0 || 120 M || || || || || || || ||
|-
| [[File:spirit532_russia_snm-32_snm_42_new.jpg|314 px]] || [[russia_snm-42 | 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 =

[http://www.fusor.net/board/viewtopic.php?f=13&t=10473&p=69673 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

= SBM-20 =

Datasheet: http://gstube.com/data/2398/

sbm-20 mount
* http://uk.rs-online.com/web/p/fuse-clips/7874249/
* Littelfuse Spring Brass PCB Mount Fuse Clip for 6.3 x 32mm Cartridge Fuse
* http://www.digikey.com/products/en?keywords=01020071Z

= SNM-11 =

[[File:mcmaster_russia_snm-11_tube.jpg|300 px]]

[[File:mcmaster_russia_snm-11_label.jpg|300 px]]

[[File:mcmaster_russia_snm-11_side_neg.jpg|300 px]]

[[File:mcmaster_russia_snm-11_side_pos.jpg|300 px]]

== Box ==

[[File:mcmaster_russia_snm-11_box_en.jpg|300 px]]

[[File:mcmaster_russia_snm-11_box_ru.jpg|300 px]]

[[File:mcmaster_russia_snm-11_box_cccp.jpg|300 px]]

[[File:mcmaster_russia_snm-11_box_ussr.jpg|300 px]]

= SNM-13 =

[[File:mcmaster_russia_snm-13_tube.jpg|300 px]]

[[File:mcmaster_russia_snm-13_conn.jpg|300 px]]

From eBay listing:

Russian Slow-Neutron Corona Counter SNM-13

Operating Voltage - 500 V

Slop of plateau, % per 100 V - ≤5

Neutron sencitivity, pulses per neutron/ cm2 - 0.5

Plateau Length - 150 V

Natural counter background, cpm - ≤ 2

Temperature range , 0C - -50... +100

Life time - more 1500 working hours

Diameter - 8.5 mm

Length - 85 mm

== Box ==

[[File:mcmaster_russia_snm-13_box_model.jpg|300 px]]

[[File:mcmaster_russia_snm-13_box_ctr.jpg|300 px]]

= SNM-17 =

[[File:mcmaster_russia_snm-17_tube.jpg|300 px]]

[[File:mcmaster_russia_snm-17_end_neg.jpg|300 px]]
[[File:mcmaster_russia_snm-17_end_pos.jpg|300 px]]

== Custom case ==

[[File:mcmaster_russia_snm-17_case.jpg|300 px]]

Someone on eBay is selling these. The negative electrode was completely lose...not sure if I'd trust it. Maybe it was secured in some way I missed when I took it apart? Other than that it seems pretty solid case. Some hot melt used to hold things together but its cleanly done.

= SNM-32 =

[[File:mcmaster_russia_snm-32_tube.jpg|300 px]]

[[File:mcmaster_russia_snm-32_end_neg.jpg|300 px]]

[[File:mcmaster_russia_snm-32_end_pos.jpg|300 px]]

http://www.fusor.eu/monitors.html#neutron_detector
* Has very good information
* Basically suggests 100M resistor with 1500V supply

== eBay listing ==

Russian Slow Neutron Corona Counter SNM-32

Operating Voltage - 1500V - 3000V

Strating Voltage - 600V - 700V

Slop of plateau, % per 100 V - ≤ 1

Neutron sencitivity, pulses per neutron/ cm2 - 0.8

Plateau Length - 1500 V

Natural counter background, pulses/sec - ≤ 1

Body Diameter - 18 mm

Body Length - 313 mm

Same thing as CHM32? [https://www.flickr.com/photos/bionerd/5623628653/in/photostream/ Maybe the datasheet]
* "Sometimes references are made to this detector as the CHM-32 detector, which is identical to SNM-32, but written in Cyrillic script"

From that page:

1. наклон плато счетной характеристики % на I в

Plateau (voltage) slope count(ing) characteristics percent in I (current?) B (voltage?) (in maximum column) 0.01

2. чувствительность счетчика к нейтронам по отношению к контрольному образцы, относит .ед.

sensitivity of the counter to neutrons with respect to the control sample refers (reference) . units. (minimum column) 0.8

3. Напряжение зажигания коронного разряда, в

Corona discharge voltage (V) (min-max) 600-700

4. средний ток коронного разряда, мкА

Average Corona Discharge Current, MicroAmps (max column) looks like 28 (23?)

5. собственный фон, имп.с ^ -I

Own background (some unit of measure, which transliterates to imp.s to the negative I; S could be impulse seconds in this case and maybe I is still current?) anyway ... (max column) 0.017

6. радиационная помехоустойчивость, Р/ч

Radiation Noise Immunity (Rads/hour) (max column) 1500 uh...WOW!

7. выходная емкость, пф

Output Capacitance (pF = picofarad?) (max column) 6

Wonder what the output impedance is?

8. сопротивление изоляции, Ом

Insulation Resistance, Ohhs. (min column) 10 to the 10th

Some of the earlier blurbs:
* tчетчикиа = partially snm32 snm42
* etiketka = label
* tчетчикиа = partially snm32 snm42, prednaznachen = intented, dlia = for, registratsii = record, miedlenih = slow, nietronov = neutron, v = in, diapasonie = diapason, energii = energy klimaticheskoi ispolnenie = climatic execution, uksl = ?, tablitcha 1 = table 1
* razmer = size
* massa = weight
* ne bolee = no more
* osnovni = main, elektricheskie = electrical, I = and, radiometritcheskie = radiometrical, parametric = parameter
* tablitcha 2 = table 2
* nameniovanie = name, parametra = parameter
* edinitcha = one (number), izmernia = measure, forma = form/shape, ne menee = no less, ne bolee = no more
* protiajennost = distance, plato tchetnoy = plateau ?, karakteristiki = characteristics
* naimenovanie = name, parametra = parameter
* edinitsa = unit, izmerenia = measure

Sounds like its intended to have a moderator around it to slow down fast neutrons.

=== Overcurrent damage ===

[[File:mcmaster_russia_snm-32_label_overcurrent.jpg|300 px]]

From misunderstanding datasheet and not using a resistor. If you see something like this on a tube don't buy it

== Box ==

[[File:mcmaster_russia_snm-32_box_en.jpg|300 px]]

[[File:mcmaster_russia_snm-32_box_ru.jpg|300 px]]

== mcmaster ==

Some notes on trouble having getting it to work

=== mk1: voltage divider ===

[[File:mcmaster_russia_snm-32_snm-32_2015-10-31_div.png|300 px]]

=== mk2: coupling cap ===

[[File:fusor.eu_helium_detector_test_setup.jpg|300 px]]

Try to follow directions here: http://www.fusor.eu/monitors.html#neutron_detector

[[File:mcmaster_russia_snm-32_snm-32_2015-11-01_cap.png|300 px]]

Above: my actual schematic

Russia - Revision history

Mcmaster: Created page with "300 px 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 / So..."