SI-8b (СИ8Б) Pancake Tube

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1 year 2 months ago - 1 year 2 months ago #6333 by Simomax
 

Here are some pictures and details about the SI-8b (СИ8Б) Pancake Geiger Muller tube. The adhesive failed between the tube and the Bakelite rear case on my tube, so it would be rude not to take it apart for a look!

From what I understand this tube is designed for soft beta detection, but is also capable of alpha, hard beta and gamma, although calibration would center on soft beta particles. I did however read this from a website: 'This Geiger-Mueller tube is only sensitive to β and γ radiation. The calibration is only correct for the γ radiation (662keV) emitted from Cs-137.' I will test at some point when I get the tube back together and have the rear case sealed back on. It is a very sensitive tube with a very large surface area and thus would be good for survey purposes. Probably too sensitive for background counting.

The Bakelite case and tube rear:
 

 

 

The anode and cathode and glass nipple:
 

 

 

 

And some close-ups of the front:
 

 

 

Here is the Russian Datasheet and below a translation of the datasheet:

 

 
ECV 6343 II652 I COUNTER SI8B
 
LABEL
 
Counter Beta radiation SI8B (hereinafter counter) is used to register the soft beta-radiation in radiometric devices.
Climatic performance U3.I.
 
Solo 15170 Date of manufacture OKT 1990
 
Circuits connecting the electrodes with the findings
 
Designation Name of the output electrode
            I Free
            3 Cathode
            5 Free
            7 Anode
 
Basic electrical and radiometric parameters
 
The slope of the plateau of the counting characteristics,%, not exceeding: 0,3
Sensitivity of the counting rate, imp.s-1.A-1.kg: 1.3 * 10E12 ... 1.9 * 10E12
Sensitivity of the counting rate (imp / uR): (350 ... 500)
The slope of the voltage-current characteristics,%, not more: 1,25
Amplitude voltage pulse, V, no less than: 20
Own background, imp / s, max: 2
Effectiveness of registration of beta radiation,%: 50 ... 85
Current sensitivity, uA: 8 ... 15 (at P = 12.9 * 10E-10 A / kg (5 uR / s))
Operating range voltage, V: 360 ... 440
Maximum operating speed counting, pulses / s: 3400
Maximum operating current, mA: 18.2
The maximum permissible exposure dose of gamma radiation, A / kg: 21.5 * 10E-6 (for 1 min)
The maximum permissible exposure dose of gamma radiation (R / h): (300) (for 1 min)

Precious metals are not contained.

The content of non-ferrous metals in a counter:
Nickel - 3.6 grams per 4-pin.
 
 
Acceptance Information
 
Counter SI8B meets specifications 0D0.339.388 TU.
 
TCI Stamp
 
At re-manufactured _________ date
 
 
 
OPERATING INSTRUCTIONS
I. After you remove the meter from the package carefully remove the protective cover and visually check to make sure that the counter has no express mechanical defects (cracks of mica, chipped enamel).

The counter can be taken only at the base. Is strictly forbidden to touch mica window.
 
2. The inclusion of the counter is made by feeding the anode voltage 390.
 
3. During operation of the counter values that determine the mode of operation, should not exceed the maximum allowable value.
Doing so may lead to loss of counters performance.
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Last edit: 1 year 2 months ago by Simomax.

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1 year 2 months ago - 1 year 2 months ago #6335 by Radslug
Nice photos & thanks for posting the spec sheets! When I initially saw the first one or two pictures, for a moment I thought those were standard 4" tiles (they're the same shade as my bathroom as a child)...which would make that an enormous tube!
Last edit: 1 year 2 months ago by Radslug.

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  • Simomax
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1 year 2 months ago #6336 by Simomax

When I initially saw the first one or two pictures, for a moment I thought those were standard 4" tiles (they're the same shade as my bathroom as a child)...which would make that an enormous tube!

Lol, no, that's just a simple cutting mat. The squares are 1cm each so it is easy to get an idea of the actual size without having to compare to something, or use a measure.

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