Monitoring Device KDU-6BM

Monitoring Device KDU-6BM

Shipboard radiation monitoring equipment

  • used on military small displacement ships instead of the obsolete KDU-6B unit
  • unique algorithm to determine the direction towards the detected source of radioactive emissions
  • measurements ranging from background values
  • full self-testing of measurement channels
  • high resistance to marine climate
Order Got a question?


    • Description
    • Description


    KDU-6BM is a state-of-the-art development replacing the outdated Soviet KDU-6B unit, which, unlike its predecessor, allows taking measurements ranging from background values, as well as more accurate determining of the direction towards the detected radiation source (four detecting units have been applied instead of two).

    The product is a part of the ship’s life support system and is designed to collect, process, visualize information about radiation environment aboard and determine the direction towards the source of radiation in order to take measures on crew protection from ionizing radiation and radioactive contamination, and ship maneuvering in the area that has been exposed to radioactive contamination from nuclear weapons, man-triggered disasters or other reasons.

    Purpose of use

    • Display of measurement results of ambient dose equivalent rate (DER) of gamma radiation obtained from the BDBG-6BM detecting units of gamma radiation

    • Determining the direction towards the source of radiation

    • Sound and light alarms of exceeding the gamma DER threshold levels


    • Display of measured gamma radiation DER from 4 detecting units is simultaneous and continuous.

    • Application of the intelligent detecting units.

    • Detecting units have the function of the integrated detectors efficiency control with generation of check information.

    • Three-color digital indicators of measurement results have been applied.

    • Ability to automatically switch from the basic power system to the backup one without information loss.


    Key specifications of the detecting units
    Name Unit of measurement Standardized values
    Measurement range of gamma radiation DER μSv/h 0.05 – 107
    Main relative permissible error limit of DER measurement at 137Cs calibration with 0.95 confidence probability % ±( 15+2/H*(10)),where H*(10) – is a numeric value of DER in μSv/h
    Energy range of the detected gamma radiation MeV 0.05 – 3.00
    Energy dependence of measurement results of the detecting unit while gamma DER measurement within the energy range from 0.05 to 1.25 MeV % ±30
    Anisotropy of the detecting unit at gamma quanta incidence at angles from + 60o to -60o on horizontal and vertical planes with regard to the main measurement direction marked with “+” symbol, for 137Cs and 60Co isotopes does not exceed % ± 30
    Operating supply voltage range of the detecting unit from external stabilized power supply V 7 – 13
    Useful current of the detecting unit for the whole range of the measured gamma radiation DER, not more than mA 30
    Time of operating mode setting and measurement time of the detecting unit, not more than min 3
    Unstable readings of the detecting unit during 24 hours of continuous operation, not more than % 5
    Additional relative permissible error limit at measurement caused by environmental temperature change from – 40 to +60 оC % 5 per each 10 оC of deviation from +20 оC
    Interface RS-485
    Dimensions of the detecting unit without fastening elements, not more than mm 100 х 80 х 250
    Weight of the detecting unit without fastening elements, not more than kg 0.5
    Ingress protection rating IP67
    Environment of use
    – air temperature оС -40 – +60
    – relative humidity up to 100 % given +50 оС and lower temperatures with humidity condensation
    Key specifications of the concentrator unit
    Name Unit of measurement Standardized values according to specifications
    Range of gamma radiation DER values display μSv/h 0.01 – 107
    Time of operating mode setting, not more than min 1
    Time of continuous operation hrs 24
    Operating supply voltage V ~220(50 Hz)
    Power consumption, not more than W 25
    Operating temperatures range oС  0 – +40
    Dimensions, not more than mm 390х390х175
    Weight, not more than kg 19
    Ingress protection rating IP23
    Environment of the concentrator unit use
    – air temperature oС 0 – +40
    – relative humidity up to 98 % given +40 oС and lower temperatures, non-condensing
    The product provides for the two threshold levels of 0.3 μSv/h and 5 μSv/h. In case of exceeding, the concentrator unit changes the color of gamma radiation DER display, highlights the transparencies of the established direction towards the radiation source, and triggers audio alarm. If the value of the gamma radiation DER measured by any of the detecting units exceeds 5 μSv/h, the concentrator unit lights up “IN ZONE” transparency.

    Delivery kit

    • BK concentrator unit, 1 pc.;
    • BDBG-6BM gamma radiation detecting unit, 4 pcs.;
    • The set of spare tools and accessories, 1 pc., including: BDBG-6BM detecting unit, BK-6BM.01 module, BK-6BM.02 module, BK-6BM.03 module, BK-6BM.04 module, passport, case;
    • Logbook;
    • Operating manual;
    • Package.

    Delivery kit may vary depending on the Customer’s demands.