Portal monitors

Portal monitors

Radiometer for neutron and gamma radiation

Portal monitors for continuous measurement of radiation level at vehicle, train or pedestrian border checkpoints, entry control points of nuclear power plants or other objects of national importance and quick detection of authorized and unauthorized export and import of neutron and gamma radiation sources.

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759Portal monitors

Radiation Portal Monitor

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Description

The radiometer is a stationary device, consisting of detecting units and measurement unit with a built-in power supply.

Detecting units convert total value of gamma radiation and neutron flux into a sequence of pulses at the output. Detecting units work by method of scintillation in plastic scintillator. A plastic scintillator, sensitive to gamma and neutron radiation, is used as a detector. The counting rate of the output pulse sequence is proportional to the density of the total flux of gamma quanta and neutrons at the point where the detecting unit is located.

Purpose of Use

Purpose of Use

  • Rapid detection of authorized and unauthorized export and import of neutron and gamma radiation sources or radioactively contaminated vehicles or cargo;

  • Control of unauthorized carrying in sources of radiation (or radioactively contaminated materials) by personnel during the passage through control area at the entrance (or exit) to the territory of industrial sites and objects of national importance, etc.

Specifications

Detected gamma radiation energy range, MeV from 0,06 to 3
Detected fast neutrons energy range, MeV from 0,2 to 10
Measurement range of neutron radiation flux density, min-1∙cm-2 from 0,1 to 10
Main relative permissible error limit of neutron radiation flux density measurement at 0.95 confidence probability, not more than, % ±40
Measurement range of flux density of gamma rays with energies of 660 keV, min-1∙cm-2 from 0,5 to 50
Main relative permissible error limit of measurement of flux density of gamma rays with energies of 660 keV at 0.95 confidence probability, not more than, % ±35
Radiometer sensitivity to gamma rays with energies of 660 keV:
– for BDPS-03M detecting unit, at least,
(imp/s)/(min-1∙cm-2)
– for BDPS-06 detecting unit, at least,
(imp/s)/(min-1∙cm-2)
300440
The range of values of measurement time is set in the limits, s from 0,125 to 128
Time of continuous work, h 24
Instability of the radiometer readings for 24 hours of continuous operation, not more than, % 5
Mean time to failure, not less than, h 10000
Average lifetime, not less than, years 10
Radiometer alarm threshold types:
– «absolute» is set up in the range of 0.2 to 50 min-1∙cm-2. When the absolute threshold is on, the radiometer responds to the excess of the total value of background radiation level and radiation emitted from the controlled object;
– «relative» is set up in the range of 10 to 1000% deviation of the flux density measurement result from the background radiation level;
– «operational» is set up in the range of 0 to 10 standard deviations (sigma) of the flux density measurement result from the background radiation level.

The values of measurement time is set from 0.125 to 128 seconds. Detection efficiency of gamma radiation and fast neutrons from the PuBe source corresponds to the values (with a deviation of ± 35%) given in the table below:

BDPS-03M detecting unit BDPS-06 detecting unit
Type of radiation Gamma radiation Neutrons Gamma radiation Neutrons
Gamma radiation energy, keV 60 660 1250 PuBe source 60 660 1250 PuBe source
Detection efficiency,% 15 100 80  not less than 400 15 100 80  not less than 500
Operating conditions
Operating temperature range, °С
– for the detecting units
– for the measurement unit and power supply
from -30 to +50
from +5 to +50
Relative humidity (at +35 °C) not more than, %
– for the detecting units
– for the measurement unit and power supply
95
80
Atmospheric pressure, kPa from 70 to 106

There are 3 modifications of the radiometer:

– for control of rail transport;
– for control of road transport;
– for control of personnel, passengers and baggage.

 

Radiometer for control of transport is a stationary device, consisting of the following components:

– detecting units (BDPS-03M or BDPS-06);
– measurement unit UAK.

 

Optionally the delivery kit can include:

– KBH-01PM object presence sensor with the IKI-03M infrared emitter for generation of a signal of the object presence in the controlled area. The sensor responds when the object crosses the infrared beam;
– BIC-09 siren for the sound and light alarm duplication in the place of installation of detecting units;
– BIC-12 remote alarm unit for BIC-09 siren performance control and for the alarm disabling after its actuation.

– two stands (primary and secondary) for fixation of the detecting units. Stands should be installed on both sides along the route of the monitored object. Depending on delivery terms, there are 1 or 2 detecting units inside of each stand. In order to reduce the influence of natural background radiation, there are lead shields installed on each side of the stands except the side directed to the monitored object.

 

Radiometer for control of personnel is designed as stationary radiometric gates consisting of two side stands (primary and secondary), the lower and upper unit. Each stand is equipped with BDPS-06 detecting unit with a 1,000 mm long scintillator.

 

The basic units of the radiometer:

– BDPS-06 detecting units (from 2 to 4 pcs.);
– measurement unit UAK;
– power supply;
– object detection device (IKI-04 infrared emitter, IKP-03 infrared receiver and two PBU-01 units);
– BIC-07 flash bulb;
– сross card PKC-19.

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