Radiation Portal Monitor

Radiation Portal Monitor

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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754Radiation Portal Monitor

Portal monitors

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Description

Radiation portal monitors are used at vehicle, train or pedestrian border checkpoints, entry control points of nuclear power plants or other nuclear industry enterprises as well as metallurgical works, radioactive materials mining, processing and storage companies, radioactive waste storage sites, at entry control points of state institutions, banks or offices, etc.

The monitor detects radioactive materials and signals if the controlled object emits radiation that exceeds the preset threshold level relatively to radiation background level.

Purpose of Use

Purpose of Use

  • Continuous measurement of radiation level, emitted from the controlled object and comparison of the measurement results with the background radiation level. If measurement results exceed the background radiation level, the alarm is actuated. Radiation level values are collected and analyzed by comparison of radiation level, emitted from the object, and on-site radiation background level.

Features

The monitor is a stationary device consisting of stand-alone units:

– PR radiation panels with BDPS gamma-radiation detecting units;
– POI controllers;
– KBH object presence sensors;
– PR radiation panels with BDPN neutron detecting units;
– BIC alarm unit;
– BNN power supply unit;
– PPC Industrial Panel PC.

Radiation panels for gamma-radiation detection are delivered with one of two BDPS detecting units depending on the delivery option. Each detecting unit includes an organic scintillation detector with sensitive volume of 7000 cm3 or 12 500 cm3. In order to reduce the influence of natural background radiation, there are lead shields installed on each side of the stands except the front side.

Radiation panels for neutron radiation detection consist of two 3He proportional counters with the volume of 800 cm3, which are placed in a plastic moderator.

Up to 4 radiation portal monitors can be simultaneously connected to the industrial panel PC. Each portal can contain from 2 to 8 radiation panels. The panel PC has the following standard ports and interfaces to connect peripheral equipment:

– two RS-232 serial ports;
– PS/2 parallel port;
– USB port;
– Mic-in/Line-out port;
– Ethernet 10/100 Base-T.

Panel PC is powered by an AC mains with the voltage of 135 … 242 V or by 24 V BNN power supply unit. In the case of mains power outage, the monitor automatically transfers to BNN power supply unit and can operate for not less than 8 hours. The battery of BNN power supply unit is recharged automatically when the mains supply is available. In the case of mains supply failure (supply voltage upper threshold crossing), the protection mechanism of the BNN unit is automatically actuated. The power supply unit can be restarted by briefly pressing the “Relay reset” button only after the cause of the accident is eliminated.

The BIC alarm unit is intended for light and sound alarm in the case of the monitor response. It is usually mounted to upper radiation panel of one of measuring frames. The sound-pressure level of the alarm is not less than 80 dB at 1 m.

The KBH object presence sensors are designed for detection of the object’s presence in the controlled area. The sensor responds when the object crosses the infrared beam. The sensors are located in pairs (receiver-transmitter) in the opposite radiation panels of the measuring frames.

“Patriot” digital video monitoring system can be included to delivery kit upon the customer’s request.

Specifications

Gamma-radiation sources activity detection thresholds at rail transport control
Gamma radiation source activity, not less than, kBq
americium-241
(241Am)
barium-133
(133Ba)
cesium-137
(137Cs)
cobalt-60
(60Co)
thorium-228
(228Th)
60000 350 600 340 200
Passage width between the radiation panels  – 6.2 m, height – 4 m above the roadway, the speed of traffic – not more than 25±2 km/h. Probability of detection of abovementioned values – not less than 0.5 with 95% confidence.
Gamma-radiation sources activity detection thresholds at the control of road transport
Gamma radiation source activity, not less than, kBq
americium-241
(241Am)
barium-133
(133Ba)
cesium-137
(137Cs)
cobalt-60
(60Co)
thorium-228
(228Th)
2000 95 170 90 60
Passage width between the radiation panels – 6 m, height – 3.5 m above ground level, the speed of traffic – not more than 10±2 km/h. Probability of detection of abovementioned values – not less than 0.5 with 95% confidence.
Gamma-radiation sources activity detection thresholds at one-sided pedestrian control
Gamma radiation source activity, not less than, kBq
americium-241
(241Am)
barium-133
(133Ba)
cesium-137
(137Cs)
cobalt-60
(60Co)
thorium-228
(228Th)
1700 70 120 65 45
Width of one-sided control zone – 1.5 m, height – 2 m above floor level, the velocity of an object – not more than 5±1 km/h. Probability of detection of abovementioned values – not less than 0.5 with 95% confidence.
Gamma-radiation sources activity detection thresholds at two-sided pedestrian control
Gamma radiation source activity, at least, kBq
americium-241
(241Am)
barium -133
(133Ba)
cesium-137
(137Cs)
cobalt-60
(60Co)
thorium-228
(228Th)
160 6 11 6 4
Width of the control zone – 0.7 m, height – 2 m above floor level, the velocity of an object – not more than 5±1 km/h. Probability of detection of abovementioned values – not less than 0.5 with 95% confidence.
Neutron flux detection thresholds at rail transport control
Neutron flux from neutron source, neutron/s
californium-252
(252Cf)
plutonium-beryllium
(Pu-α-Be)
25000 100000
Passage width between the radiation panels – 6.2 m, height – 4 m above the railroad tracks, the speed of traffic – not more than 25±2 km/h at false alarm probability of not more than 0,001.
Neutron flux detection thresholds at the control of road transport
Neutron flux from neutron source, neutron/s
californium-252
(252Cf)
plutonium-beryllium
(Pu-α-Be)
11000 45000
Passage width between the radiation panels – 6 m, height 3.5 m above ground level, the speed of traffic is not more than 10±2 km/h at false alarm probability of not more than 0,001.
Neutron flux detection thresholds at one-sided pedestrian control
Neutron flux from neutron source, neutron/s
californium-252
(252Cf)
plutonium-beryllium
(Pu-α-Be)
4500 18000
Width of one-sided control zone – 1.5 m, height – 2 m above ground level, the velocity of an object – not more than 5±1 km/h at false alarm probability of not more than 0,001.
Neutron flux detection thresholds at two-sided pedestrian control
Neutron flux from neutron source, neutron/s
californium-252
(252Cf)
plutonium-beryllium
(Pu-α-Be)
400 1600
Width of the control zone – 0.7 m, height – 2 m above floor level, the velocity of an object – not more than 5±1 km/h at false alarm probability of not more than 0,001.

BDPS detecting unit of gamma radiation sensitivity to rays of radionuclide, which is located in a fixed position on each radiation panel is not less than (imp/s)/kBq:

– 5 for 241Am radionuclide;
– 70 for 133Ba radionuclide;
– 60 for 137Cs radionuclide;
– 110 for 60Co radionuclide;
– 70 for 228Th radionuclide.
In this case, expanded uncertainty of the detecting unit sensitivity does not exceed ±30%.

BDPN detecting unit of neutron radiation sensitivity to 252Cf (or Pu-α-Be) neutrons radiation source, located in a fixed position on each radiation panel is not less than 0.013 imp/ neutron. Expanded uncertainty of the detecting unit sensitivity does not exceed ± 50%.

Operation mode setup time is not more than 30 minutes.

Monitors continuous operation time: running on AC power – at least 24 hours a day, running on autonomous battery power – not less than 8 hours.

Mean time to failure is not less than 10000 h. (by failure is meant operational disorder of the monitor, leading to non-compliance to the detection threshold, and false alarms frequency).

Average lifetime of the monitor is not less than 10 years with consideration for replacement of individual overage modules and components.

 

Operating conditions
Environment temperature, °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 84 to 106,7
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