KR100960538B1 - A watchdog system and it's protocol for the mobile radiation sources - Google Patents

Abstract

The present invention tracks the location of a radiation source to be used while moving by using WCDMA or CDMA and GM radiation dosimeter, GPS function, RF wireless near field communication method in real time, and measures the radiation dose around the radiation source. The present invention relates to a remote monitoring method of a mobile radiation source that can be controlled and managed using an image transmitting and receiving device.

CDMA, WCDMA, mobile radiation sources.

Description

A watchdog system and it's protocol for the mobile radiation sources

The present invention is to check the status of mobile use of non-destructive testing radiation sources scattered throughout the country through the Geographic Information System (GIS) in real time, and to manage the movement path and radiation dose to strengthen the level of non-destructive testing radiation source security management and the theft or The present invention relates to a remote monitoring method of a mobile radiation source that prevents loss and provides location information for early repair in case of an accident.

In recent years, the mobile use of the radiation source has been urgently needed to develop a device for securing safety against theft and loss due to the industrial development, convenience of use, and continuous increase in diversity.

In particular, after the September 11 terrorist attacks in 2001, countries around the world have become interested in the potential for terrorism using radiation sources (terrorism using "dirty bombs"). Accordingly, there has been a demand for a drastic improvement in the management of radiation sources for non-destructive inspection, which are frequently moved and have a high risk of loss of radiation sources. Recently, the US Nuclear Regulatory Commission (USNRC) and the International Atomic Energy Agency (IAEA) have been working on safety management of radiation sources worldwide. To this end, the necessity of strengthening the security management of radiation sources was raised by utilizing the IT technology possessed by Korea, and a radiation management device or system for a model that will become a world standard has been required.

In the related art, location and radioactivity measurement data are managed through a global positioning system (GPS), a CDMA, and a GM tube and a PIN diode, which are commonly used (registered patent 10-0470465). However, in the conventional invention, it is not suitable to attach to the mobile irradiator, so there is a difficulty in checking the status and managing the position of the mobile irradiator in an emergency. In addition, as a result of simply creating a module with a CDMA function and making a location tracking management system, it is easy to be damaged when handling the site, and there are difficulties in operation.

In Korea Patent Publication No. 10-0671736 It was difficult to receive the location in the communication shadow area by simply receiving the location information using CDMA, GPS or GPSone. In addition, the RF method used in the shaded area has a problem in that the exact location cannot be found because the reception area of the frequency is short and there is a lot of noise.

In the Korean Utility Model Registration No. 20-0348306, it is difficult to receive a location in a communication shadow area by simply receiving location information using CDMA and GPS.

The present invention is not suitable to attach to the mobile irradiator has a difficulty in checking the status and location management of the mobile irradiator in an emergency, and simply made a module with a CDMA function to create a location tracking management system, resulting in damage during on-site handling Easy to operate It is difficult to receive location in the shadow area by simply receiving location information using CDMA and GPS or GPSone.

In the RF method used in the shadow area, it is a problem to be solved by the present invention to solve the problem of inaccurate location reception where the reception area of frequency is short and there is a lot of noise.

The present invention is to check the status of mobile use of non-destructive testing radiation sources scattered throughout the country through the Geographic Information System (GIS) in real time, and to manage the movement path and radiation dose to strengthen the level of non-destructive testing radiation source security management and the theft or It is a problem solving means of the present invention to provide a method for remote monitoring of a mobile radiation source that prevents loss and provides location information for early remediation when an accident occurs.

The present invention tracks the location of a radiation source to be used while moving by using WCDMA or CDMA and GM radiation dosimeter, GPS function, RF wireless near field communication method in real time, and measures the radiation dose around the radiation source. The present invention relates to a remote monitoring system and a protocol of a mobile radiation source capable of controlling and managing an image using a transmitting and receiving device. Through this invention, the use of mobile radiation sources can be monitored remotely from a central control system through text or image, which can prevent the loss or theft of radiation sources and prevent the occurrence of radiation emergency accidents. have.

In order to achieve the above object and to solve the problems of the prior art, the present invention comprises the steps of remote communication with the RFRP by the RF module of the main body;

Monitoring a dose rate around a mobile radiation source using a GM monitor;

Determining a location of a mobile radiation source by transmitting and receiving with a GPS satellite by a GPS receiver; The data received from the RF module of the main body, the data on the position of the mobile radiation source by the GPS receiver, and the data of monitoring the dose rate around the mobile radiation source using the GM monitor are analyzed and analyzed by the ultra low power microprocessor. Remotely communicating with the central control center by CDMA or WCDMA at the request of the central control center; An LCD monitor relates to a remote monitoring method of a mobile radiation source, comprising the step of displaying the status and communication status of the main body, including the dose rate.

The present invention is separated into a main body and a small RFRP (Radio Frequency for Radiation Projector) with a built-in GM radiation dosimeter, GPS function, RF (Radio Frequency) wireless local area communication method, and attached to a mobile radiation irradiator, between the main body and RFRP By controlling remotely using communication, the main body can not only control one RFRP and one-to-one, but also control multiple RFRPs into one main body, which enables more economical control. By using the remote communication function, the location of the radiation source to be used while moving is tracked in real time, and the radiation dose around the radiation source can be measured to prevent and take action against radiation accidents. It is an invention for controlling and managing images.

The present invention can collect the dose data of the surroundings by attaching GM tube as well as tracking the current image and location of mobile radiation source through image and SMS text service using WCDMA. The data can be received and received in real time to prevent radiation accidents and early detection.

In the present invention, the RF method used in the shaded region has a short reception area of frequency and a lot of noise, and thus an accurate position cannot be found. In order to solve the problems of the prior art, it is separated into a main body and a small radio frequency for radiation projector (RFRP) with a built-in GM radiation dosimeter, GPS function, RF (Radio Frequency) wireless local area communication method, and attached to a mobile radiation irradiator, Remote control between the main body and RFRP using RF communication enables the main body not only to control one RFRP and one-to-one, but also to control multiple RFRPs to one main body, enabling more economical control. It became.

The remote monitoring system of a mobile radiation source according to the present invention is configured as shown in FIG. The present invention is separated into a main body and an RFRP.

First, the configuration of the main body will be described. The main body monitors the GPS receiver for determining the position of the mobile radiation source, the CDMA or WCDMA for telecommunications, the LCD indicator for displaying the main body status and communication status, including the dose rate, and the dose rate. It is composed of GM monitor, RF module of main body for remote communication with RFRP, ultra low power microprocessor and rechargeable battery for electronic part operation of main body.

RFRP of the present invention is a form of the RF module attached to a mobile radiation source having a unique RFRP ID to the mobile radiation source attached to the body at regular intervals by sending the magnetic ID information and battery status to the wireless communication to the main body to remotely monitor the radiation source do.

The present invention enables an economical management system by allowing one main body to manage a mobile radiation source having up to 10 RF modules. The completed body is shown in Figure 2, RFRP is shown in Figure 3, respectively.

The main body of the present invention always monitors the dose using the GM monitor when the power is on, and manages the information received from the RFRP. The central control center requests information from the main body through the SMS method, and the requested information is returned through the wireless TCP / IP method.

At this time, the information data to be sent by the main body includes information such as the location of the mobile radiation source, the average radiation dose around the radiation source in 10 minutes, the radiation dose value in one minute period, the mobile source ID controlled.

According to the present invention, CDMA is used when information is requested using a text method, and WCDMA can be used to monitor the main body and the mobile radiation source through a direct image of the periphery of the main body.

The present invention assesses gamma dose rates using a GM monitor to monitor dose around a mobile radiation source.

In this case, the number of radiation pulses collected by the GM monitor in the environment of the radiation level is less than 7 counts per minute, so the algorithm for fast and accurate dose evaluation in seconds at this low count rate is very important. To this end, the present invention applies a dose evaluation algorithm as follows.

In the ultra-low power microprocessor of the present invention, two ring buffers A and ring buffer B are prepared for dose estimation according to continuous and accurate statistics even at a low counting rate. In the ring buffer A, five GM coefficients are stored, and a coefficient of two seconds is stored every two seconds. The ring buffer B stores 15 coefficients in units of 10 seconds, and stores the sum of all five GM coefficients of the ring buffer A every 2 seconds.

The coefficient of the ring buffer B takes the average value in order to evaluate GM dose rate, and the average value is converted into GM dose rate by a dose rate conversion formula.

If the coefficient in units of 10 seconds is greater than 6, the GM dose rate is converted to the value of the ring buffer A. If the coefficient in units of 10 seconds is less than or equal to 6, the GM dose rate is converted to the value of the ring buffer B. As a result of this application, the dose value that stabilizes the dose rate of the environmental level within 2 decimal places was converted.

As a method for displaying a GM coefficient with a large statistical variation, a simulation was performed as shown in FIG. 4 to examine the effect of the GM coefficient storage method as described above. First, raw data (Raw Data) is represented by the black data trend line of FIG. 4 so that the variation is large, and the result of applying the algorithm of the present invention is represented in red.

As can be seen from the figure, it was confirmed that the algorithm developed in the present invention has a stable value and well followed the change of the raw data count rate.

In location tracking method of mobile radiation source using long distance telecommunication, GPSOne CDMA including GPS function is used in CDMA. This method requires time and cost to be certified for CDMA's own GPSone during development, and location accuracy is low every week because GPS is not received indoors.

Therefore, in the present invention, a small and independent GPS module that does not require additional authentication is embedded. In the area where GPS is received, the location accuracy is improved, and in the area where GPS is not received, the CDMA base station-based location is secured like the existing method, thereby solving the authentication problem required for development and enabling accurate location tracking.

In addition, in case of main body, besides displaying measured dose rate, it should express communication with central control center, battery level, current time, etc., and much information such as presence or absence of RFRP control. Indicator was used.

In addition, the low-power microprocessor consumes about 300uA of current in sleep mode for low-current operation. The rechargeable battery uses a 3.7V lithium-ion power supply. By doing so, it is possible to charge while moving the vehicle, can be charged during storage in addition to the work time of about 8 hours a day, and it is necessary to take measures that can be charged in an emergency.

On the other hand, the main body of the present invention is equipped with an RF module of the same type of main body for communication with the RFRP. The RFRP is equipped with an RF module attached to a mobile radiation source interfaced to an ultra-power microprocess, and designed to be easily attached to the mobile radiation source.

At this time, in order to suppress the consumption of the rechargeable battery as much as possible, it is designed to send only the unique ID and battery information assigned to each RFRP, and wakes up in the sleep mode (consumption of about 300 uA) which is the minimum current mode of the microprocessor only when sending. An algorithm that sends information and enters sleep mode after 1 second is adopted.

In the case of the present invention, since one main body is designed to control up to 10 RFRPs, a communication protocol is made as shown in FIG. 5 so that the same frequency can be controlled without confusion, which will be described in detail as follows.

In the main body, when the RF transmission / reception cycle is reached, it becomes active in sleep mode and prepares to receive from RFRP. The main body receives outgoing messages from a total of 10 RFRPs with the same frequency channel. However, if data is received at the same time, the correct message cannot be received due to crosstalk. Therefore, RFRP transmits according to the transmission cycle according to ID.

Sending cycle = RFRP_ID x 2 seconds + 10 seconds + set sending cycle

Here, the transmission cycle is at least 1 minute. To describe the operation in detail, for example, when the IDs (RFRP_IDs) of 10 RFRPs are managed and the RFRPs are set to transmit at 2-minute intervals, each RFRP has its own transmission period, that is, its own Send a message when ID x 2 seconds + 10 seconds. The main body should receive up to 10 RFRP messages every two minutes. Therefore, every 2 minutes, activate the RF module of the main body, and when all messages are received, go into sleep mode.

In order to allow the user to freely set the ID of the RFRP, each RFRP is activated for the first minute after the battery is inserted, allowing the user to synchronize with the time of the START-II main body and go to sleep mode. After that, it wakes itself up at the specified time, sends a message, and goes back to sleep.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a schematic view of the mobile radiation source remote control system of the present invention, FIG. 2 is a detailed view of the main body of the present invention, FIG. 3 is a detailed view of the RFRP of the present invention, FIG. 4 is a GM coefficient variation graph of the present invention, and FIG. Shows the

Body 1, GPS receiver 10, CDMA 20 or WCDMA 21, LCD display 30, GM monitor 40, Body RF module 50, Ultra low power microprocessor 60, Charging It can be seen that the type battery 70, RFRP 200, RF module 201 attached to the mobile radiation source, mobile radiation source 210, the central control center 300, GPS satellite 400.

Looking at the structure, as shown in Figures 1 to 5, the remote monitoring system of a mobile radiation source of the present invention is composed of a main body (1), RFRP (200) for transmitting and receiving with the main body (1),

As shown in FIG. 1, the main body 1 receives and analyzes all data, and transmits the analyzed results to each device to collectively control the devices, and to connect the rechargeable battery 70 to an ultra low power microprocessor 60. And a GPS receiver 10 connected to the ultra low power microprocessor 60 and transmitting / receiving a GPS satellite 400 to determine a position of the mobile radiation source 210, and on one side of the ultra low power microprocessor 60. Connected to the CDMA 20 or WCDMA 21 for remote communication with the central control center 300 and the other side to the ultra low power microprocessor 60, and the state of the main body 1 including the dose rate. LCD display 30 for displaying the communication status with the GM monitor 40 for monitoring the dose rate of the ultra low power microprocessor 60, is connected to one side of the ultra low power microprocessor 60, RFRP (200) For remote communication with It consists of a RF module 50 of the body,

The RFRP 200 is a structure of a remote monitoring system of a mobile radiation source consisting of a structure of the RF module 201 attached to the mobile radiation source having a unique RFRP ID to the mobile radiation source 210.

In more detail the system of the present invention,

Remotely communicating with the RFRP 200 by the RF module 50 of the main body;

Monitoring the dose rate around the mobile radiation source 210 using the GM monitor 40;

Determining the position of the mobile radiation source 210 by transmitting and receiving with the GPS satellite 400 by the GPS receiver 10;

The data received by the RF module 50 of the main body, the data on the position of the mobile radiation source 210 by the GPS receiver 10, and the dose rate around the mobile radiation source 210 using the GM monitor 40 The monitored data is analyzed by the ultra low power microprocessor 60, and the analysis result is remotely communicated with the central control center 300 by the CDMA 20 or the WCDMA 21 at the request of the central control center 300. Steps;

It is a mobile radiation source remote monitoring method comprising the step of displaying the state and the communication state of the main body 1 including the dose rate by the LCD display 30.

In the above, the remote communication with the central control center 300 sends a command to the mobile radiation source remote control device by SMS (SMS) method, and transmits the data collected through the wireless TCP / IP connection of the CDMA 20 modem. CDMA 20 remote data collection to transmit to 300,

In addition, the remote monitoring method of the mobile radiation source, characterized in that the user can directly monitor the user surroundings of the mobile radiation source 210 through the image using the WCDMA 21 modem.

In the above, in order to evaluate continuous and stable dose rates even at a low count rate of environmental radiation, a dose rate measurement algorithm is used to automatically calculate real-time dose rates according to the amount of count rates using two ring buffers.

The remote monitoring system and the protocol of the mobile radiation source of the present invention used a protocol as shown in FIG. 5 capable of multi-controlling the main body 1 and up to 10 RFRPs 200 with high efficiency and low power.

1 is a general view of a mobile radiation source remote control system of the present invention

2 is a detailed view of the main body of the present invention

Figure 3 RFRP details of the present invention

4 GM coefficient variation graph of the present invention

5 communication protocol detail of the present invention

<Description of the symbols in the drawing>

Body 1, GPS receiver 10, CDMA 20 or WCDMA 21, LCD display 30, GM monitor 40, Body RF module 50, Ultra low power microprocessor 60, Charging Type battery 70, RFRP 200, RF module 201 attached to the mobile radiation source, mobile radiation source 210, the central control center 300, GPS satellite 400.

Claims (5)

In the remote monitoring method of a mobile radiation source, Remotely communicating with the RFRP 200 by the RF module 50 of the main body; Monitoring the dose rate around the mobile radiation source 210 using the GM monitor 40;  Determining the position of the mobile radiation source 210 by transmitting and receiving with the GPS satellite 400 by the GPS receiver 10; The data received by the RF module 50 of the main body, the data on the position of the mobile radiation source 210 by the GPS receiver 10, and the dose rate around the mobile radiation source 210 using the GM monitor 40 The monitored data is analyzed by the ultra low power microprocessor 60, and the analysis result is remotely communicated with the central control center 300 by the CDMA 20 or the WCDMA 21 at the request of the central control center 300. Steps, Displaying and monitoring the status and communication status of the main body 1 including the dose rate by the LCD indicator 30, Monitoring using the GM monitor 40 is Monitor using a dose rate measurement algorithm that utilizes two ring buffers to automatically calculate real-time dose rates based on the amount of count rates, Remotely communicating the result of the analysis with the central control center 300 by the CDMA 20 or the WCDMA 21 at the request of the central control center 300 The CDMA 20 used for remote communication with the central control center 300 sends a command to the mobile radiation source remote control device in a text (SMS) manner, and is collected through a wireless TCP / IP connection of the CDMA 20 modem. And transmitting data to the central control center (300) and directly monitoring the user's surroundings of the mobile radiation source (210) via an image using a WCDMA (21) modem to remotely communicate with the mobile radiation source. delete delete delete delete

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