CI-22BG (SI-22BG)

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6 years 7 months ago #1534 by Sonarflash
CI-22BG (SI-22BG) was created by Sonarflash
This is a large tube, glass, about 7 inches long and 1 inch diameter with grid cap connectors at each end.
I purchased 1 from Sovtube and was delighted that it worked nicely at 400 VDC. It will work as low as 350 VDC.

A beta/gamma tube, it is connected to my DIY (Brohogan) GK4 kit. Using a 10 megohm anode resistor in place of the DIY on-board 4.7M, it averages around 65 CPM background.

At $10.00 Canadian plus shipping, this tube was a real bargain. Perfect for experiments. I wonder that it isn't mentioned more often on various sites. Perhaps, because of the size, those of us obsessed with miniaturization don't want to use it in a detector?
I've ordered two more of these from Sovtube.
The CI-22BG bare was bathed in UV-C light from a toothbrush sterilizer with no effect, so I guess it's safe to state that it isn't light sensitive.
Presently, it's atop my hutch, clicking on the Brohogan DIY GK4. I've wrapped it in a strip of laminate underlay for protection. Connections are simple, just solid wire leads wrapped and then twisted around the grid cap pins and covered by a bit of electrical tape.
Being blind, I don't often go in for soldering, rather leave that to ham club techs.
Brian, VA7BDG

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6 years 6 months ago #1614 by Sonarflash
Replied by Sonarflash on topic CI-22BG (SI-22BG)
Now I'm confused. Sovtube sent me two CI-22BG tubes, but they are only 3" long and tiny. These are not the CI-22BG I previously received. What's more, near as ighted friends can tell, the 7" long by 3/4" diameter tube has the same designation, CI-22BG, though the letters are in Russian, 'C backwards N'
Anybody have a clue as to what the larger tube is?
The smaller pair Sovtube sent in the second order have a gas fill nipple at the anode end and are not very sensitive.
I've written Sovtube 3 times asking if anybody can clarify this issue. No luck.

.

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6 years 6 months ago #1615 by Sonarflash
Replied by Sonarflash on topic CI-22BG (SI-22BG)
That was supposed to say "near as sighted friends can tell". I can't see.

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6 years 6 months ago #1635 by Sonarflash
Replied by Sonarflash on topic CI-22BG (SI-22BG)
I finally got measurements on this "CI-22" tube. It is 220mm long and 19mm diameter. I also finally understand why Sovtube sent it (mistakenly) in place of a Russian CI-22BG (SI-22BG). Oddly, it has the etched on designation of "CI-22", and I'm just guessing that instead of a Sirylic "BG" it must only have "G".
Guess that's why the mistake in shipping, and why I got a bargain. Almost 3 times as long as the CI-22BG tubes, a lot larger diameter and considerably more background sensitivity.

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4 years 10 months ago #3469 by Sonarflash
Replied by Sonarflash on topic CI-22BG (SI-22BG)
Here's an answer to this old question.
The Russian Soviet era CI-22BG (CI-22BG) is the smaller glass tube, while the SI-22G (CI-22G) is the large glass tube.
Below are the Sovtube specifications.
**
RUSSIAN GM TUBE CI-22G
Also SI-22G
Large glass GM tube for detecting GAMMA
Initial Voltage: 360-440V
Working Voltage: 360-440V
Recommended Operating Voltage: 400V
Inherent counter background (cps): 1.16 Pulses/sec
Plateau Inclination: 0.125%/V
Plateau Length: 100V
Range of working temperature: 40: +50 c
Anode Resistance: 9-13 MOhms
Length: 220mm
Diameter: 22mm

**
RUSSIAN GM TUBE CI-22BG
Also SI-22BG
small glass GM tube for detecting hard BETA & GAMMA
Gas fill nipple on side, end nearest +anode pin
Working Voltage: 350-450V
Maximum registering range: 1000 Roentgen/hour
Working Current: 0.015 - 0.02 milliamps
Plateau Length/ Inclination: 100V/0.15%/V ?
Length: 70mm
Diameter: 10mm

**

Sovetube sent me two SI-22BG tubes by mistake when I wanted the much larger SI-22G. They corrected this in a following order and I kept the pair of smaller tubes, though I'll likely never use them as they seem to be designed for measuring extremely hard radiation (post-holocaust fallout?).

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