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 2.GQ Geiger Muller Counter
 SBM-14 in GMC-500 Plus?
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FBSMatt

Ireland
27 Posts

Posted - 10/26/2020 :  11:27:55  Show Profile  Reply with Quote
Just a simple idea/experiment. I found a couple SBM-14 tubes in my stash, how do I go about installing one in a 500+?

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Reply #1

EmfDev

1243 Posts

Posted - 10/26/2020 :  12:25:14  Show Profile  Reply with Quote
Need to check voltage compatibility with the 500+. M4011 tube voltage sits around 400V. If the SBM-14 tube is too long, might need to use as external. Need to change calibration parameters also.
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Reply #2

FBSMatt

Ireland
27 Posts

Posted - 10/26/2020 :  12:42:53  Show Profile  Reply with Quote
quote:
Originally posted by EmfDev

Need to check voltage compatibility with the 500+. M4011 tube voltage sits around 400V. If the SBM-14 tube is too long, might need to use as external. Need to change calibration parameters also.

The length of them is as about 104mm.
The voltage is the fun bit! They operate at around 1,200V. Thatís why I want to experiment with it! I found them in with some NOS SBM-20 tubes I bought to replace my M4011, which broke after fall (rod came loose, so it only operates probably in a curtain orientation). If I canít get it working, oh well, guess Iíll just install a boring SBM-20 and not the random thing I found in the bottom of an old Soviet brown box that I canít find any information on. They do operate up to 300 Celsius, so thatís cool I guess.

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Reply #3

Damien68

France
241 Posts

Posted - 10/27/2020 :  06:57:30  Show Profile  Reply with Quote
SBM-14, I didn't know him, this one is a big one like a "rolling pin" but the GMC-500+ can't supply 1240v for it. 400-500v is OK.



Mastery is acquired by studying, with it everything becomes simple
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Reply #4

FBSMatt

Ireland
27 Posts

Posted - 10/27/2020 :  08:37:43  Show Profile  Reply with Quote
quote:
Originally posted by Damien68

SBM-14, I didn't know him, this one is a big one like a "rolling pin" but the GMC-500+ can't supply 1240v for it. 400-500v is OK.




oh well. Iíll just install a SBM-20 then. What calibration factors should I use for it?

Also. If someone could provide info on what the SBM-14 was used in, that would be great as all I can find are a few eBay listings.

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Reply #5

Damien68

France
241 Posts

Posted - 10/27/2020 :  11:01:29  Show Profile  Reply with Quote
like you i just find one seller on ebay.
it should work like an SBM-20 but bigger.
this means that since its detection volume is greater, it will make measurements of the same quality but faster than a single SBM-20.
for example with an SBM-20 it takes 60 minutes to make a measurement with a minimum confidence index. with a tube 2 times bigger it will take 2 times less time, with a tube 4 times bigger 4 times less time
but it is not necessarily a good calculation and it should be better to connect for example 4 SBM-20 in parallel.
it was surely made to monitor background values on sensitive sites or in any case fairly low levels of radiation

Mastery is acquired by studying, with it everything becomes simple

Edited by - Damien68 on 10/27/2020 11:20:35
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Reply #6

FBSMatt

Ireland
27 Posts

Posted - 10/27/2020 :  12:10:47  Show Profile  Reply with Quote
Just to check (before I go to dig out that box again), will even the SBM-20 fit in the 500+? I just opened it to remove the M4011 and noticed no extra adjustments for the clip clamp thingy(s). Whatís the work around if so?

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Reply #7

Damien68

France
241 Posts

Posted - 10/27/2020 :  22:41:21  Show Profile  Reply with Quote
the sbm20 is a little longer than the M4011 it can't simply fits instead.

Mastery is acquired by studying, with it everything becomes simple
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