Detection unit BDMG-100 is designed to measure the fields of gamma radiation in a wide range of dose rates.
Output signal – a sequence of normalized, statistically distributed pulses contains measuring information about the power of the equivalent of ambient dose H * (10) (PED) of gamma radiation.

Energy range of registered gamma rays

MeV

From 0,05 to 3,0
sensitivity*:

«sensitive» channel —

«rough» channel —

(4,4±0,44) с-1·for 1 mkZv·h-1

(5,0±2,0) с-1·for 1 mkZv·h-1
Measurement range** —

The upper limit of measured MED of gamma-radiation

«sensitive» channel —

«rough» channel —

from 0.1 mkZv·h-1 to 10,0 Zv·h-1

2,0 mkZv·h-1

10,0 Zv·h-1
Own background, с-1

No more than 0,7 («sensitive» channel)
Energy dependence of sensitivity *, %

30,0
Detector type

Geiger-Muller Counters, CBM-20 -2pcs;
СI-34G — 1 pc.

A control signal (switching of channels)

Low level- voltage supply to the counters of both channels;
high level – voltage supply to the counter of the “rough” channel
Overall dimensions, mm

Ø40×250
Mass, kg

0,5
Connecting cable length, m

20,0 (may be increased up to 200)

Note:  *           — radiation of  137Cs radionuclide

**          —optional-the upper limit of the measured gamma radiation MED of the “rough channel” can be increased up to 100.0 Zv • h-1

ELECTRICAL CHARACTERISTICS

Power supply – DC voltage from 7,0 to 12,6 v. The consumed current is not more than 30 mA. Variants of the detection unit: BDMG-100; BDMG -100-01; BDMG -100-02; BDMG -100-03.

Socket — plug RS-10.

Designation of contacts:

Contact

Signal designation

Commentaries
1 + Uп 7,0 – 12,6 В

2

Control

Set  with an external device:
– Low level – permit to supply high voltage to the counters of “sensitive”and “rough” channels (B1, B2, B3);
– High level (close to + 5 V) – permit to supply high voltage to the counter of the “rough” channel (B3)

4

Output of the “sensitive” channel

 Output of the “sensitive” channel:
Square-wave pulses of about (1,5±0,5) mks

Performance:
00 – Negative;. amplitude  – 5 V
01 – Positive; amplitude – 5 V
02 – Negative; amplitude – U pit
03 – Positive; amplitude – U pit.

5

Output of the “rough” channel.

 Output of the “rough” channel:
Square-wave pulses of about (1,5±0,5) mks

Performance:
00 – Negative;. amplitude of – 5 V
01 – Positive; amplitude – 5 V
02 – Negative; amplitude – U pit
03 – Positive; amplitude – U pit.
9 ┴ Screen , connected to contact 10
10 General General, connected to contact 9

Variant of the detection unit — BDMG-100-07.

Socket — plug ОНЦ-БС-1-7/12.

Designation of contacts:

Contact

Signal designation

Commentary
1 + Uп 7,0 – 12,6 В
2 Control

Set  with an external device:
– Low level – permit to supply high voltage to the counters of “sensitive”and “rough” channels (B1, B2, B3);
– High level (close to + Uп) – permit to supply high voltage to the counter of the “rough” channel
4 Output of the “sensitive” channel. Output of the “sensitive” channel: positive square-wave pulses with an amplitude close to +Uп level,  duration of (1,5±0,5) mks
5 Output of the “rough” channel. Output of the “rough” channel. positive square-wave pulses with an amplitude close to +Uп level,  and duration of  (1,5±0,5) mks
6 ┴ Screen
7 General General
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