Russian Pancake tube SI-8B / СИ8Б

From Ebay, I acquired a N.O.S (new old stock) Russian Pancake GM tube SI-8B / СИ8Б.
It has a diameter of 8cm and is very sensitive:
A quick test showed a background radiation count between 3 and 10 CPS (counts per second), compared to between 3 and 10CPM with my FHZ76V tube !! This is a 60-fold higher count rate !!
I'll do some more tests and measurements soon.

 

The specifications sheet are in Russian language. 

If somebody can translate these specification sheets from Russian to English or German, I would very much appreciate that! Please leave a comment!

Update: Katze typed the Russian text of the datasheet in a wordprocessing document, which can now be easily translated, so many thanks to Katze for this great job :-) .

Here is the translation:

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.

Manufacturer of SI8B