Radiation Monitoring System PM520


Polimaster Radiation Monitoring System PM520 is used for the prevention of the illicit penetration of radioactive sources into the limited-access areas/buildings and for continuous gamma and neutron radiation monitoring of different facilities where radioactive and nuclear sources are stored or processed.


Radiation Monitoring System PM520 - all-in-one easy customized solution for the effective detection of gamma and neutron sources to ensure radiation security on the Customer facility.


  • Suitable for use by untrained personnel
  • All-in-one solution for detection of gamma and neutron radiation source in secured areas
  • Up to 8 external gamma and neutron detectors
  • High Sensitive NaI detector for detection of tiny amounts of gamma radiation sources
  • Easy Configurable and flexible design for convenient installation
  • Suitable for outdoor use
  • Cost effective alternative for Pedestrian Portal Monitor
  • Convenient deployment and installation
  • Up to 1000m radius of covered area


  • External probes for detection of gamma and neutron radiation
  • Radiation monitoring of large areas and remote separate locations
  • Remote control PC for user programmable settings
  • Various radiation probes (GM tube, CsI, NaI, He-3) for different tasks of radiation safety
  • DER measurement range:
  • - 0.1 µSv/h - 10 Sv/h for γ radiation

    - 1.0 µSv/h - 5 mSv/h for neutron radiation relative Pu-α-Be collimated source

  • Detection of neutron sources
  • Detectors environmental protection IP 65
  • Operating temperature range - 20 to +50 ° C


PM520 applications include, but are not limited to use in the following areas:
  • Nuclear Facilities
  • Waste Management
  • Areas and Buildings with limited access
  • Border/Airport Check points
  • Places of storage and use of nuclear materials

PM520 can be deployed in several separate locations or in passageways outdoors. Apart from other systems, PM520 has flexible configuration and uses up to 8 wall-mounted Gamma and Neutron Probes of different sensitivities and measurement ranges, main processing unit and remote PC for operation monitoring control with maximum distance between probes and unit up 1000 m. This configuration allows extending the range of controlled area with possibility of transferring measurement data to the single coordination center.

PM520 accommodates the following detectors (from PM1403 series):

  • BDG -1: highly-sensitive 1.5’x1.5’ NaI detector for detection of low sensitive gamma sources
  • BDG -2: GM probe for reliable dose rate measurement of highly insensitive radiation sources
  • BDG -3: CsI detector which is cost effective solution for the effective detection of the common nuclear and radiation sources
  • BDN: He-3 detector for the detection of neutron sources.

PM520 main processing unit has two independent alarm thresholds ATTENTION and DANGER. It processes dose rate measurements from distributed radiation probes over the area and alerts users if thresholds are above the average background by visual and sound alarms. Thus PM520 can be used even by untrained personnel.

Thresholds can be calculated automatically during self-calibration or user programmable. Optionally, PM520 can be supplied with PC control unit with the installed Configuration Software for the adjusting settings, sensitivities and alarming thresholds of particular detectors. Additionally PM520 can be equipped with external alarming devices and has possibility for integration into Customer security system.

PM520 represents multipurpose system with configurable design that can be customized to solve various radiation protection tasks on the Customer facilities.

Radiation Monitoring System PM520 - Proven Polimaster quality for the radiation safety!


Detector TypeUp to 8 detectors

BDG2: Geiger-Muller counter
BDN: Slow neutron detector He - 3
Sensitivity for 137Сs, no lessBDG1: 800 s-1/( µSv/h)
BDG3: 200 s-1/( μSv/h )
Energy range
BDG1: 0,03 to 3,0 MeV
BDG2: 0,03 - 3,0 MeV
BDG3: 0,05 - 3.0 MeV
BDN: from thermal to 14,0 MeV
DER Measurement Range0.1 µSv/h – 10.0 Sv/h
Search neutron channel
DetectorBDN: Slow neutron detector He - 3
- for Pu - α-Be
- for thermal neutrons
- for Pu - α-Be on a phantom or in the moderator
0,3 (s-1)/(neutron/s·cm2)
1,2 (s-1)/(neutron/s·cm2)
Energy Rangeto 14.0 MeV
Physical characteristics
ConfigurationWall Mounted
Output- 8/16 safety relays for integration into the security system (60 V, 320 mA)
- 2 additional relays. One for external alarm unit, second for faults (60 V, 320 mA)
BDG1: 290х70 mm
BDG2: 162х40 mm
BDN: 230х60 mm
Weight, kgBDG1:1400 g
BDG2: 110 g
BDG3: 160 g
BDN: 660 g
AlarmsLED, Sound
Environmental Characteristics
Operation temperature- 20 to 50 °С
Humidity up to 95%
Air presurefrom 84 to 106,7
PC Communication
PC CommunicationRS -485, USB


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