KR101581004B1 - Radiation detecting system for incoming and outgoing system vehicles - Google Patents

Abstract

The present invention relates to a radiation monitoring system for incoming and outgoing vehicles to measure radiation of vehicles passing an entrance. According to an embodiment of the present invention, the radiation monitoring system for incoming and outgoing vehicles comprises: one or more sensing parts to sense vehicles, and then to detect radiation; and a control part to control the sensing parts. The sensing part comprises: a support frame erected on an entrance; a vehicle sensing device installed in the support frame to sense the vehicles passing the entrance; a radiation detector installed in the support frame to detect radiation when the vehicle sensing device senses the vehicles; and a connection box installed in the support frame to electrically connect the vehicle sensing device and a radiation sensing part to the control part.

Description

[0001] RADIATION DETECTING SYSTEM FOR INCOMING AND OUTGOING SYSTEM VEHICLES [0002]

FIELD OF THE INVENTION The present invention relates to a radiation measurement system, and more particularly, to an exit vehicle radiation monitoring system that measures radiation for a vehicle passing through a door.

Exit vehicle radiological surveillance systems were developed for surveillance of access vehicles at security facilities such as nuclear weapons institutes.

In recent years, radiation has been used in various fields such as nuclear power facilities or medical facilities.

However, it is difficult to build a precise but complex and costly access vehicle radiation surveillance system in most civilian medical facilities.

Accordingly, there is a demand for an access vehicle radiation monitoring system that is easy to install and maintain, and can be easily managed and operated by a general user.

Embodiments of the present invention provide an access vehicle radiation monitoring system that is easy to install and maintain, and can be easily managed and operated.

According to an embodiment of the present invention, an exit vehicle radiation monitoring system for measuring radiation for a vehicle passing through a door includes at least one sensing unit for sensing a vehicle and detecting radiation, and a control unit for controlling at least one sensing unit . The sensing unit may include a support frame installed on the door, a vehicle sensing device installed on the support frame to sense a vehicle passing through the door, and a control unit installed on the support frame, And a connection box provided on the support frame for electrically connecting the vehicle sensing device and the radiation sensing unit to the control unit.

The information processing unit may further include an information processing unit for receiving the radiation detection information from the control unit and performing at least one of information confirmation, information storage, information display, and information output.

The entrance vehicle radiation monitoring system may further include a surveillance camera for photographing a vehicle passing through the sensing unit. The surveillance camera can photograph the number plate and the outline of the vehicle sensed by the vehicle sensing apparatus. When the radiation sensed by the sensing unit exceeds the allowable reference value, the information processing unit receives the signal from the control unit, and the information processing unit may store information or output information of the image photographed by the surveillance camera together with information measured by the sensing unit.

The control unit divides the data measured by the sensing unit by 256 according to the gamma energy range, sets the channel, divides the nuclides through an energy window classified according to the accumulated counts for each channel, May perform one or more operations to identify, store information, display information, or output information for the identified nuclides.

The radiation detector can be converted into an electrical signal by sensing a gamma ray using a plastic scintillator and a photomultiplier tube installed inside a sealed aluminum case.

The vehicle sensing apparatus may include an infrared (IR) sensor for transmitting and receiving infrared rays, and a reflector for reflecting the infrared rays transmitted by the infrared sensor toward the infrared sensor.

The entrance vehicle radiation monitoring system may further include an alarm unit for receiving a signal from the control unit and generating an alarm signal when the radiation sensed by the sensing unit exceeds an allowable reference value.

When the vehicle sensing apparatus senses a vehicle and the radiation detector detects a radiation level of the radiation detector in a state before the vehicle enters the vehicle, An alarm can be generated by sending a signal to the alarm part.

According to the embodiment of the present invention, the entrance vehicle radiation monitoring system is easy to install and maintain, and can be easily managed and operated.

1 is a configuration diagram of an entrance vehicle radiation monitoring system according to an embodiment of the present invention.
FIG. 2 is a block diagram showing the sensing unit of FIG. 1. FIG.
FIG. 3 is a configuration diagram showing the radiation detector of FIG. 1. FIG.
FIG. 4 is a graph showing the radionuclides classified by the radiation detector of FIG. 3; FIG.
FIG. 5 is a circuit diagram showing the vehicle sensing apparatus and the connection box of FIG. 2 together.
6 is an image showing a state in which radiation of a vehicle is detected according to the entrance and exit vehicle radiation monitoring system of FIG.
FIG. 7 is an image obtained by dividing the radionuclide detected by the information processing unit according to the entrance and exit vehicle radiation monitoring system of FIG. 1; FIG.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art to which the present invention pertains. The present invention may be embodied in many different forms and is not limited to the embodiments described herein.

The drawings are schematic and illustrate that they are not drawn to scale. The relative dimensions and ratios of the parts in the figures are exaggerated or reduced in size for clarity and convenience in the figures, and any dimensions are merely illustrative and not restrictive. And to the same structure, element or component appearing in more than one drawing, the same reference numerals are used to denote similar features.

The embodiments of the present invention specifically illustrate ideal embodiments of the present invention. As a result, various variations of the illustration are expected. Thus, the embodiment is not limited to any particular form of the depicted area, but includes modifications of the form, for example, by manufacture.

Hereinafter, an entrance vehicle radiation monitoring system 101 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG.

The exit vehicle radiation monitoring system 101 according to an embodiment of the present invention measures the radiation of a vehicle passing through a door, and can integrally manage radiation measurements on all doors even when there are a plurality of doors.

1, an exit vehicle radiation monitoring system 101 according to an embodiment of the present invention includes a control unit 700 for integrally controlling at least one sensing unit 200 and at least one sensing unit 200 .

The access vehicle radiation monitoring system 101 may further include an information processing unit 500, a surveillance camera 300, and an alarm unit 400 according to an embodiment of the present invention.

The sensing unit 200 may be installed in one or a plurality of units depending on the number of gates of the facilities in which the entrance vehicle radiation monitoring system 101 is installed.

2, the sensing unit 200 includes a support frame 210, a vehicle sensing device 220, a radiation detector 250, and a connection box 270, .

The support frame 210 may be fixedly or detachably mounted on the ground of the door.

The support frame 210 may be provided in a pair such that the support frames 210 face each other with a space through which the vehicle passes.

Further, the support frame 210 is installed to have a length in the vertical direction. In one example, the support frame 210 may have a height of at least 1.5 meters above ground.

A radiation detector 250 is mounted on the support frame 210 to detect the radiation of the vehicle passing through the doorway while the vehicle sensing device 220 described below senses the vehicle.

3, in one embodiment of the present invention, the radiation detector 250 includes an aluminum case, a plastic scintillator 251, and a photomultiplier tube 252.

The radiation detector 250 may further include a preamplifier circuit 253 and a discrimination circuit 254, a pulse shaping circuit 256 and a calculator 257 have.

The aluminum case is sealed to prevent light and moisture.

A plastic scintillator 251, a photomultiplier tube 252, a pre-amp circuit 253, a discrimination circuit 254, a pulse shaping circuit 256, And the calculator 257 are installed inside the aluminum case.

A plastic scintillator (251) generates a glare inside when it receives a gamma ray.

In an embodiment of the present invention, a PVT scintillator may be used as the plastic scintillator 251.

PVT is a plastic scintillation product made of polyvinyltoluene compound. PVT is superior to other plastic scintillators in terms of reactivity to Gamma radiation and compton continuum.

A photomultiplier tube 252 takes the flash generated by a plastic scintillator 251 and converts it into electricity and amplifies it. At this time, the photo multiplier tube 252 amplifies the signal up to 1000000 times.

The electrical signal from the photomultiplier tube 252 is removed from the noise and converted into a useful signal through the pre-amplifier circuit 253 and the discrimination circuit 254 .

In addition, the pulse shaping circuit 256 performs waveform manipulation to obtain certain specific information from the information contained in the electric pulse.

In addition, the amplifier circuit 253, the discrimination circuit 254, and the like receive +/- 15 V from the power supply to generate a high voltage power required for the photomultiplier tube 252.

The arithmetic unit 257 integrates the pulse generated by the preamplifier circuit 253 to change the current value to a voltage value, counts the pulses received from the pulse shaping circuit 256, classifies the pulse according to the magnitude of the voltage value of the pulse, do. For example, the operator 257 classifies and stores the voltage value into 256 values.

That is, the operator 257 divides the gamma energy range of 0 keV to 3000 keV by 256, assigns the voltage values of the pulses according to the ratios, counts the pulses of the respective voltage values, and accumulates them in the allocated buffer for a predetermined time. 256 processes managed in this way are called 256 channels.

10 buffers per channel and 10 counts per second are added to obtain an energy window rate. In other words, the updated counts of 256 channels every 100 ms are stored separately in 10 buffers every 100 ms, and the counts stored in the 10 buffers of each channel are added every 1 second to adopt the final counts per channel.

Because pulses typically count from millions of counts to millions of counts, a channel count can be counted for a single channel for 100ms.

Through the energy window thus classified, the radionuclides of the detected radiation are distinguished, as shown in FIG.

A description of the nuclides by window shown in Fig. 4 is shown in the following table.

section Window Nuclide Remarks One HEU (Highly Enriched Uranium) window U235, Highly enriched uranium 2 WGPu (Weapons-Grade Plutonium) window Ba133, Pu239 Barium, inorganic grade platonium 3 Cs137 window Cs137 cesium 4 Du window Du, Co60 Depleted uranium, cobalt 5 K window K40 potassium 6 NOISE window Natural radioactive material

As described above, in one embodiment of the present invention, the nuclides can be distinguished through a radiation energy window classification technique.

In addition, in one embodiment of the present invention, the radiation detector 250 is connected to a connection box 270, which will be described later, through a plurality of shield lines through the metal cable gland.

The vehicle sensing device 220 is installed in the support frame 210 to sense a vehicle passing through the door. A plurality of vehicle sensing devices 220 may be installed in one support frame 210 as required.

5, the vehicle sensing apparatus 220 includes an infrared (IR) sensor 221 for transmitting and receiving infrared rays, a reflector 221 for reflecting the infrared rays transmitted by the infrared sensor 221 back toward the infrared sensor 221, a reflector 222 may be included.

The infrared sensor 221 transmits an infrared signal normally and receives an infrared signal reflected from the reflector 222 and returned. The infrared sensor 221 regards the vehicle as being detected if there is no return signal.

The control unit 700 may detect the presence of radiation contamination in comparison with the radiation detected by the radiation detector 250 after the vehicle sensing apparatus 220 senses the vehicle using the radiation detected by the radiation detector 250 as a reference value, If the allowable range of the reference value is exceeded, an alarm can be generated by sending a signal to the alarm unit 400 to be described later.

When the vehicle leaves the entire vehicle sensing apparatus 220, one measurement is terminated, and the result of the relevant case can be stored in the information processing unit 500, which will be described later, through the control unit 700.

In addition, when the vehicle sensing apparatus 220 senses the vehicle signal and the predetermined time has elapsed, the controller 700 sends an alarm to the alarm unit 400 to be described later to generate an alarm. Here, the predetermined time may be 10 minutes, for example.

When the vehicle sensing apparatus 220 is installed, the infrared sensor 221 is moved up and down and left and right so as to face the reflector 222, and the infrared sensor 221 is fixed when transmission and reception of the infrared signal are all confirmed.

The connection box 270 is installed on the support frame 210 and is connected to the vehicle sensing device 220 and the radiation detector 250 and electrically connects them to the control unit 700.

In one embodiment of the present invention, the connection box 270 serves to ensure a connection between the radiation detector 250 and the controller 700. Specifically, the connection box 270 controls connection of the connection cable, adjustment of the high voltage power required for the radiation detector 250, power supply to the vehicle sensing device 220, and vehicle sensing information of the vehicle sensing device 220, (700).

The connection box 270 also includes a fuse for protection of the circuit and the connection of the cables to the control unit 700, the radiation detector 250, and the vehicle sensing unit 220 may be abnormal, 270) is opened, an alarm signal can be generated.

1, the control unit 700 is connected to the vehicle sensing device 220 and the radiation detector 250 through the connection box 270 and exchanges information signals with the vehicle sensing device 220 and the radiation detector 250 as shown in FIG. In addition, when a plurality of the sensing units 200 are used, one controller 700 can integrally control and manage the plurality of sensing units 200. [

In an embodiment of the present invention, the alarm unit 400 can simultaneously generate sound and flash. However, the embodiment of the present invention is not limited thereto, and the alarm unit 400 may generate only one of sound and flash.

For example, the alarm unit 400 can generate approximately 90 dB of high sound and flash of 2 seconds interval.

The control unit 700 can generate an alarm through the alarm unit 400 even when the radiation sensed by the sensing unit 200 does not exceed the allowable reference value. For example, when the vehicle sensing apparatus 220 senses the vehicle continuously for a predetermined time or longer, the control unit 700 may send an alarm to the alarm unit 400 to generate an alarm. At this time, the predetermined time may be appropriately set according to the accessing method and the condition of the entrance door of the facility in which the entrance vehicle radiation monitoring system 101 is installed. For example, the predetermined time may be 10 minutes.

The surveillance camera 300 photographs a vehicle passing through the sensing unit 200. For example, the surveillance camera may be CCTV. The surveillance camera 300 photographs a license plate and an outer shape of the vehicle sensed by the vehicle sensing device 220.

The information processing unit 500 receives the radiation detection information from the control unit 700 and performs at least one of information confirmation, information storage, information display, and information output.

That is, when the sensing unit 200 completes one radiation detection job for one vehicle, the control unit 700 can record the detection information in the information processing unit 500 and store the detection information.

At this time, the information to be stored may store the radiation measurement information for the vehicle in a CSV file together with the date and time. This information can then be read and utilized by the vehicle scale system. Here, comma-separated values (CSV) are text data and text files in which some fields are separated by a comma (,). CSV has been widely used in spreadsheet and database software for decades as a de facto standard for data exchange.

In addition, the user can check and monitor the detected information in real time through the information processing unit 500.

In addition, the image information captured by the surveillance camera 300 can also be confirmed, stored, displayed, or output in the information processing unit 500.

When the radiation sensed by the sensing unit 200 exceeds the allowable reference value, the information processing unit 500 receives a signal from the control unit 700, and the information captured by the surveillance camera 300 is combined with information measured by the sensing unit 200 Display, or save or output.

As shown in FIG. 6, on the screen that can be monitored by the information processing unit 500, it is possible to provide the detected amount of radiation for the passing point and the end point of the vehicle, that is, the passing time. If the height of the graph indicating the detected radiation dose exceeds the allowable reference value, the control unit 700 not only generates an alarm but also records the information.

In addition, the information processing unit 500 may output real-time information or recorded information as a printed matter.

Specifically, the information processing unit 500 may include a computer 510, a monitor 520, and a printer 530.

Also, the control unit 700 can analyze the data measured by the sensing unit 200 and classify the nuclides stochastically. As shown in FIG. 7, the information processing unit 500 can perform at least one operation of confirming information, storing information, displaying information, or outputting information for the separated nuclides.

In addition, the controller 700 estimates the speed of the vehicle based on information of the vehicle sensing device 220 sensing the vehicle, and controls the speed of the vehicle based on the estimated speed.

For example, a warning can be generated when a vehicle passes through a door at an excessively high speed.

With this configuration, the entrance vehicle radiation monitoring system 101 according to the embodiment of the present invention is easy to install and maintain, and can be easily managed and operated.

That is, not only can the control unit 700 and the sensing unit 200 be electrically connected to each other, but they can be easily separated using the connection box 270. In addition, if an abnormality occurs in the wiring, the corresponding part can be easily found and repaired.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. will be.

It is therefore to be understood that the embodiments described above are to be considered in all respects only as illustrative and not restrictive, the scope of the invention being indicated by the appended claims, It is intended that all changes and modifications derived from the equivalent concept be included within the scope of the present invention.

101: Exit Vehicle Radiation Monitoring System
200:
210: Support frame
220: Vehicle sensing device
221: Infrared sensor
222: Reflector
250: Radiation detector
251: Plastic scintillator
252: photomultiplier tube
253: Pre-amp circuit
254: Discrimination circuit
256: Pulse shaping circuit
257: Operator
270: connection box
300: Surveillance camera
400: Alarm section
500: Information processing unit
510: Computer
520: Monitor
530: Printer
700:

Claims (8)

CLAIMS What is claimed is: 1. An entrance vehicle radiation monitoring system for measuring radiation for a vehicle passing through a doorway,
At least one sensing unit for sensing a vehicle and detecting radiation; And
A control unit for controlling at least one of the sensing units
/ RTI >
The sensing unit includes:
A support frame erected at the door;
A vehicle sensing device installed on the support frame for sensing a vehicle passing through the door;
A radiation detector installed on the support frame and detecting radiation when the vehicle sensing device senses the vehicle;
A connection box installed on the support frame for electrically connecting the vehicle sensing device and the radiation sensing unit to the control unit; And
And an information processing unit for receiving at least one of radiation detection information from the control unit and performing at least one of information confirmation, information storage, information display, and information output, the system comprising:
The control unit divides the data measured by the sensing unit by 256 in accordance with the gamma energy range, sets the channel, assigns the voltage value of the pulse according to the ratio, and stores an energy window classified according to the accumulated count number for each channel. , And the nuclide
Wherein the information processing unit performs at least one of information identification, information storage, information display, and information output for the discriminated nuclides,
The radiation detector uses a Compton continuum of a flash generated by a PVT scintillator in a sealed aluminum case and receives a gamma ray. A photomultiplier tube irradiates the flash with an electrical signal And removing the noise by the pre-amplifier circuit and the discrimination circuit, and the pulse shaping circuit performs the waveform manipulation. delete The method of claim 1,
And a surveillance camera for photographing a vehicle passing through the sensing unit,
The surveillance camera photographs the number plate and the outer shape of the vehicle sensed by the vehicle sensing device,
Wherein the information processing unit receives the signal from the control unit when the radiation sensed by the sensing unit exceeds an allowable reference value, and stores or outputs the image photographed by the surveillance camera together with information measured by the sensing unit. Surveillance system. delete delete The method of claim 1,
Wherein the vehicle sensing device comprises:
An infrared (IR) sensor for transmitting and receiving infrared rays;
A reflector for reflecting the infrared rays transmitted by the infrared sensor toward the infrared sensor,
And an exit vehicle radiation monitoring system. The method of any one of claims 1, 3, and 6,
And an alarm unit for receiving a signal from the control unit and generating an alarm signal when the radiation sensed by the sensing unit exceeds an allowable reference value. 8. The method of claim 7,
When the vehicle sensing apparatus senses a vehicle and the radiation detector detects a radiation level of the radiation detector in a state before the vehicle enters the vehicle, An exit vehicle radiation monitoring system that sends a signal to an alarm unit to generate an alarm.

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