KR20020048113A - A personal exposure dosimeter and coming in and out control system - Google Patents

Abstract

PURPOSE: An electronic personal dosimeter and an entrance management system of the same are provided to heighten a minuteness of an electronic personal dosimeter by preparing a reader and a system management computer. CONSTITUTION: An electronic personal dosimeter(100) displays an atomic bomb quantity according to a detection of radiation and generates an alarm in comparison with an established value. A reader(200) outputs a message for controlling an entrance and an entrance control signal for controlling an equipment control unit. A system management computer(300) processes data received from the reader(200), generates various statistical data, displays a system operation state on a display unit, and outputs a signal for controlling a system.

Description

Electronic personal exposure dosimeter and access control system {A PERSONAL EXPOSURE DOSIMETER AND COMING IN AND OUT CONTROL SYSTEM}

TECHNICAL FIELD The present invention relates to radiometers, and more particularly, to a personal exposure dosimeter for a nuclear power plant and an access control system comprising the same.

Techniques related to radiometers have been conducted in some research institutes and universities as interdisciplinary research but not systematically or systematically. In recent years, the progress of radiometric technology has led to the commercialization of portable radiometers.

However, portable radiometers, especially personal exposure dosimeters, which are currently commercialized, are less reliable in their precision accuracy, and there is a great need for improvement in miniaturization and light weight. In addition, the exposure and access control dosimeter system used by nuclear power plants and research institutes in Korea is expensive because it is imported from all over the world. Localization of the system is urgently needed. In addition, the conventional personal exposure dosimeter is designed to transmit data by directly connecting to the dosimeter reader when the operation is completed while carrying out work carried out by the radiation field operator of the nuclear power plant or hospital. There is a disadvantage that is not designed to facilitate the connection with facility control devices.

Accordingly, it is an object of the present invention to provide an electronic personal exposure dosimeter and access management system that can increase the precision and miniaturization and light weight.

Another object of the present invention to provide an electronic personal exposure dosimeter and access management system that can be linked to the facility control device.

1 is a block diagram of an access management system including an electronic personal exposure dosimeter according to an embodiment of the present invention.

2 is a block diagram of the dosimeter 100 of FIG. 1.

3 is a block diagram of the signal processor 110 of FIG. 2.

4 is a detailed circuit diagram of FIG. 3.

5 is a peripheral circuit diagram of the microprocessor 115 of FIG.

6 is a diagram illustrating an LCD display window which is the display unit 125 of the dosimeter 100 according to the embodiment of the present invention.

7A-7C are outline views of a dosimeter 10 according to an embodiment of the invention.

8 is a block diagram of a reader 200 according to an embodiment of the present invention.

FIG. 9 is a detailed circuit diagram of a main board of FIG. 8. FIG.

FIG. 10 is a detailed circuit diagram of a sub board configuring FIG. 8. FIG.

11 is a flowchart of the operation of the reader 200 when the dosimeter 100 user enters the entrance area according to the embodiment of the present invention.

12 is a flowchart of the operation of the reader 200 when the user of the dosimeter 100 according to the embodiment of the present invention leaves the entrance area.

13 is an outline view of a reader 200 in accordance with an embodiment of the present invention.

In order to achieve the above object, the present invention provides an electronic personal exposure dosimeter which displays the exposure amount according to the radiation detection, generates an alarm according to the comparison of the set alarm set value and the exposure amount, and transmits and receives data with the reader according to the setting mode;

Controlling messages and facility control devices that send and receive accumulated dose doses, individual IDs, and alarm settings of an individual between a connected dosimeter and a system management computer, and permit or control entry and exit according to signals input from the system management computer. A reader for outputting an access control signal for

A system management computer that processes and analyzes the data received from the reader to produce various statistical data, displays the system operation status on the display, generates a plurality of reader control and dosimeter recognition, and generates signals necessary to control the facility control device. It is characterized by the configuration.

The present invention also provides an electronic personal exposure dosimeter,

PIN junction silicon semiconductor detector for generating electrical signals of different levels by gamma radiation, a signal processor for forming and amplifying and outputting a pulse of a signal output from the semiconductor detector, a signal and keypad input from the signal processor The microprocessor controls the operation of the dosimeter, the alarm display, and the exposure level according to the signal input from the micrometer. The microprocessor controls to operate in the independent mode and the system mode, the infrared communication unit for communication with the reader, and the control of the microprocessor. A display unit for displaying a system operation state according to the present invention, an alarm display unit driven under the control of the microprocessor, a keypad capable of calibrating the dosimeter, and generating key data for setting an operation mode and setting a variable; A power supply unit for supplying operation power, and the power supply Characterized in that the power source composed of a check for checking the payment of the remaining battery level.

Hereinafter, the configuration and operation of a personal exposure dosimeter for a nuclear power plant according to an embodiment of the present invention will be described in detail. In the following description and the annexed drawings, numerous specific details, such as circuit configuration and memory size, of a microcomputer constituting the system control unit are shown to provide a more general understanding of the present invention. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details. Meanwhile, detailed descriptions of well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

First, FIG. 1 is a block diagram of an access management system including an electronic personal exposure dosimeter according to an embodiment of the present invention. The access management system is largely divided into a personal exposure dosimeter 100, a reader 200, and a system management computer. 300).

In FIG. 1, the electronic personal exposure dosimeter 100 displays the exposure amount according to the radiation detection, generates an alarm according to the set alarm setting value and the exposure amount comparison, and transmits and receives data with the reader according to the setting mode.

The reader 200 transmits / receives the accumulated dose dose, the personal ID, and the alarm setting values of the individual between the dosimeter 100 and the system management computer 300 to be connected, and according to a signal input from the system management computer 300. It outputs a message to permit or control entry / exit and an access control signal to control the facility control device, and provides data input function to the user.

The system management computer 300 processes and analyzes the data received from the reader 200 to produce various statistical data, displays the system operation status on a display unit, and generates signals for system control such as control of a plurality of readers and a dosimeter. It plays a role.

Hereinafter, the configuration and operation of the dosimeter 100, the reader 200, and the system management computer 300 will be described in detail with reference to the drawings.

FIG. 2 shows a block diagram of the dosimeter 100 of FIG. 1. The dosimeter 100 operates in a system mode that can be used in conjunction with the reader 200 by an independently usable user mode and automatic recognition. In the user mode, the user may directly input variables for operating the dosimeter 100 normally.

On the other hand, the operating characteristics of the dosimeter 100 according to the embodiment of the present invention has a specification according to the IEC 61526 standard as shown in Table 1 below.

Item range Limit Measuring range Dose equivalent H (10): 10 Sv Dose equivalent rate: 1 Sv / h Dose equivalent: ± 15% Dose equivalent: ± 20% Reaction time Increase <5 seconds decrease <10 seconds <± 10% Alarm accuracy All set values Accumulated dose equivalent: ± 15% Dose equivalent rate: ± 20% Gamma ray energy 50 keV to 6 MeV ± 20% (Cs-137) Directionality: Gamma rays 0 ° to ± 60 ° ± 20% (Cs-137) Dose rate dependence 1Sv / h ± 20% DC power supply 6 months ± 15% Data retention 50 years ± 10% Drop test 1.5m ± 10% Vibration test (10-30 Hz) ± 15% Microphonics 10 cm <1 μSv Operating temperature -10 ℃ -40 ℃ -20 ℃ -50 ℃ ± 20% ± 50% Temperature shock -10 ℃ and 50 ℃ ± 15% (relative to 20 ℃) Relative humidity 40% to 90% (35 ℃) ± 10% External electric field 100 V / m @ 100 to 500 kHz 1 V / m @ 500 MHz to 1 GHz ± 10% ± 10% External magnetic field 60 A / m @ 50 or 60 Hz ± 10% Electrostatic discharge 8KV, 2mJ ± 10%

Referring to FIG. 2, first, the dosimeter 100 forms a PIN-junction silicon semiconductor detector 105 that generates different levels of electrical signals by gamma radiation, and forms a pulse of a signal output from the semiconductor detector 105. Dosimeter in a manner that displays the operating state of the dosimeter, the alarm display and the exposure dose in accordance with the signal processor 110 for amplifying and outputting the signal, the signal input from the signal processor 110 and the signal input from the keypad 135 Microprocessor 115 for controlling the overall operation of the 100, Infrared communication unit 120 for communication with the reader 200, LCD for displaying the system operating state under the control of the microprocessor 115 and The same display unit 125, the alarm display unit 130 driven under the control of the microprocessor 115, and the dosimeter 100 can be calibrated and changed to operate in a user mode. A key pad 135 for generating key data for setting the number, a power supply unit 140 for supplying operation power to each of the dosimeter 100, and a power check unit 145 for checking the remaining battery level .

For reference, in FIG. 2, the signal processor 110 for processing the output signal of the semiconductor detector 105 is a charge sensitive type used in a radiation measurement circuit, and as shown in FIG. 3, a hybrid amplifier. Can be configured.

3 is a block diagram of the signal processor 110 of FIG. 2, and FIG. 4 is a detailed circuit diagram of FIG. 3. 3 and 4, the signal processor 110 may be largely divided into a preamplifier circuit and a main amplifier circuit.

In describing the preamplifier circuit, the PIN semiconductor detector 105 decreases the impedance in the reverse direction by the operating voltage, and the charge generated in the detector due to the interaction by the radiation is collected through the coupling capacitor. AC coupling was used to cut the bias voltage of the detector and connect it to the detector through a coupling capacitor to feed the charge back to the input of the preamplifier. In addition, integrating circuit was configured to collect enough charge in consideration of the detector's capacitance of 23 pF, and a capacitor with a capacitance of 220 pF was connected to the output of the detector so that an appropriate time constant was set for shaping the current pulse. . The collected charge was connected to a JFET having low noise, high gain, and low input capacitance as a current pulse having a positive polarity, thereby forming a preamplifier circuit as a charge sensitive signal processing circuit as shown in FIG. In addition, a feedback circuit was developed to improve the stability and signal-to-noise ratio of the preamplifier circuit, reduce signal distortion, and improve noise characteristics. In order to increase the open-loop gain of the preamplifier, a constant current circuit is constructed to correct the amplification of the amplifier due to the DC voltage variation.

On the other hand, since the signal output from the preamplifier is weak, the main amplifier is required as a secondary amplifier as shown in FIG. 4 to amplify the signal to a size that can be counted. In order to combine the output of the preamplifier and the input of the main amplifier, a high pass circuit is constructed to block the input DC component. In addition, the high pass circuit serves as a clipping circuit to prevent the pile up phenomenon that occurs when amplifying many pulses by using a capacitor and a resistor to have a time constant equal to the width of the pulse current. In addition, the time constant of the current pulse shaping of the preamplifier is not affected.

The negative current pulse that passed through the clipping circuit was connected to the base of the PNP transistor to be amplified. In order to improve the S / N ratio of noise caused by electronic devices or external noise, the transistor is configured as a common ground amplifier, and a circuit is configured to act as a buffer amplifier. Although the output voltage is about 1/2 of the power supply voltage, a high gain amplifier is constructed using a JFET to compensate for this.

On the other hand, the pulse signal output from the main amplifier circuit described above is inverted the waveform for the coefficient and the Schmitt trigger circuit is configured to form a shaping circuit. In consideration of the count rate of the digital signal output from the shaping circuit, a 16-bit counter is constructed using two 12-bit binary counters and designed to be counted at the input terminal of the microprocessor 115 to manufacture a circuit as shown in FIG. 5. The counting circuit is also one component of the signal processor 110 described above.

For reference, the microprocessor 115 used in the dosimeter 100 according to the embodiment of the present invention has an 8 kbits program memory structure, has a flash program memory of 8k x 8 bits and a data memory of 512 x 4 bits. In addition, the circuit shown in FIG. 5 may be configured using Samsung's KS57C2308 chip capable of controlling a 128-segment LCD. In FIG. 5, the SEG0 to SEG23 terminals output signals for driving the LCD segment, and the COM0 to COM3 terminals, which are input / output ports, transmit data on the data bus of the SEG0 to SEG23 terminals when controlling the LCD, which is the display unit 125. Controls when writing or reading. The pulse output from the P2.3 terminal triggers the buzzer which is one of the alarm display unit 130 through Q1 and Q2. The outputs of the counter composed of 17 bits to which the output pulses of the signal processing unit 110 are input are connected to P4.0 to P7.3, which are I / O terminals. A red LED is connected to the P2.1 terminal to indicate an alarm, and an IR receiver optical transistor is connected to the P1.0 and P3.3 terminals and IR is connected to the P2.0 terminal for infrared (IR) communication with the reader 100. Transmitting photodiode was connected to make infrared communication asynchronous.

A push switch was connected to the P0.1 to P0.3 terminals and the P1.1 to P1.2 terminals so that the user can set the parameters so that the user can operate the dosimeter 100 using the keypad 135 independently. 1 kbit EEPROM was connected to P3.0 and P3.1 terminals so that the variables are stored for 50 years even if the power supply is interrupted for the storage of variables. A voltage detection IC was connected to the P1.3 terminal to detect the remaining amount of the power supply voltage and displayed on the LED, and a transistor was connected to the P3.2 terminal to turn on / off the power supply voltage supplied to the signal processing unit 110.

6 is a diagram illustrating an LCD display window which is the display unit 125 of the dosimeter 100 according to the embodiment of the present invention. In the dosimeter 100 according to the embodiment of the present invention, items as shown in FIG. 6 are displayed, and these items are described as follows.

ID: 5-digit user serial number

: Dose equivalent rate μSv / hr (Basic unit; Sv / hr)

Unit Conversion ; μSv / hr, mSv / hr, Sv / hr

H: dose equivalent; μSv (base unit; μSv)

Unit Conversion ; μSv, mSv, Sv

Battery indicator: Low battery level indicator

CPS: Count value per minute in calibration mode

CAL: Calibration Mode

ALARM: Alarm Level Display

7A to 7C illustrate the external form of the dosimeter 10 according to the embodiment of the present invention. In particular, FIG. 7A is a front view of the dosimeter 100, FIG. 7B is a rear view of the dosimeter 100, and FIG. 7C. Shows a side view of the dosimeter 100, respectively. As shown in FIG. 7A, the display unit 125 on the front of the dosimeter 100 displays the user's ID, the measured dose equivalent rate, the radiation dose, and the variables inputted to the keypad 135. When the battery is depleted, the battery indicator appears. It was made. As shown in FIG. 7B, an infrared communication element 120 for transmitting and receiving data with the reader 200 and a buzzer 130 for generating an alarm are provided on the back of the dosimeter 100. Was placed, and the wearing clip was attached to the back of the dosimeter 100 as shown in FIG.

Hereinafter, the operation of the dosimeter 100 having the above-described configuration and appearance will be described. First, the dosimeter 100 according to the embodiment of the present invention has three operation states and four operation modes.

The three operating states are largely divided into sleep status, stop status, and active status. First, the sleep state means an operation standby state, in which the microprocessor 115 periodically checks the state of the semiconductor detector 105 and the battery. The data in the sleep state is stored in a memory provided in the microprocessor 115. The stationary state is a state when the battery is removed or completely discharged, and the dosimeter 100 does not perform any function. In this case, the LED of the display unit 125 remains off. The active state is the normal operation of the dosimeter, with the data stored in memory.

On the other hand, with reference to the operation mode, the operation mode of the dosimeter 100 can be largely divided into system mode and independent mode. In this case, the system mode is a mode in which the dosimeter 100 is used as a part of the entrance management system. In the system mode, data is transmitted and received between the dosimeter 100, the reader 200, and the system management computer 300.

The independent mode is a mode in which the dosimeter 100 is used alone without the reader 200, and is divided into a user mode and an administrator mode. In the user mode and the administrator mode, respectively, the user and the administrator can set internal variables through the keypad 135.

The manager mode is used to calibrate the dosimeter 100, and the manager may change the factor calibration, counting time, and dead time by selecting the manager mode. The user mode is a mode in which the dosimeter 100 is set to operate alone. The user may change an ID number and an alarm set value.

Hereinafter, the operation of the entrance management system including the dosimeter 100 when entering a predetermined area will be described. In this case, the dosimeter 100 operates in the system mode.

First enter a certain area;

① When the dosimeter 100 in the sleep state is inserted into the reader 200, the reader 200 detects the insertion of the dosimeter 100 and starts communication one second after the completion of the mounting only when mounted in the normal position.

② The reader 200 provides the dosimeter 100 with a communication start signal to inform the start of communication and waits for a response from the dosimeter 100 to be returned.

③ When the dosimeter 100 receives a communication start and initialization signal from the reader 200, the dosimetry 100 initializes the cumulative dose equivalent and dose equivalent ratio to 0 and enables the user to prepare to start working.

④ Dosimeter 100 is an individual to be transmitted from the reader 200 when the user enters a personal ID and job number into the reader 200 and the reader 200 is determined to be normal by transmitting to the system management computer 300 Record ID, alarm set point, etc. in internal memory.

⑤ When the personal dose alarm setpoint is input, the dosimeter 100 stores it and applies it to the alarm.

(6) When the communication completion signal is received from the reader 200, the dosimeter 100 starts to detect the radiation signal and calculates it as a cumulative dose equivalent and displays it on the display unit 125.

On the other hand, the user can not change all the variables of the dosimeter 100, but can check the alarm set value of the ID number, cumulative dose equivalent and dose equivalent ratio on the display unit 125.

Hereinafter, the operation of the access management system including the dosimeter 100 when leaving a predetermined area,

① When the dosimeter 100 is inserted into the reader 200, the reader detects the insertion of the dosimeter 100 and starts communication one second after completion of the mounting only when mounted in the normal position.

② The reader 200 notifies the dosimeter by providing a communication start signal to the dosimeter 100 and waits for the response of the dosimeter 200 to be returned.

③ If there is a response from the dosimeter 100, the reader 200 requests transmission of data to the dosimeter 100, and the requested dosimeter 100 transmits the user ID and the accumulated dose to the reader 200.

④ After the transmission to the reader 200 and the transmission confirmation are completed, the dosimeter 100 is switched to the sleep state and waits until the next input.

Hereinafter, the dosimeter 100 operating in the independent mode will be described. First, when the mode + INC + DIG key is simultaneously pressed from the keypad 135, the microprocessor 115 switches to the user mode and becomes active. User mode is off. In this user mode, the dosimeter 100 displays the cumulative dose equivalents and dose equivalent ratios from the time when the dosimeter 100 becomes active. In the user mode, the user can input variables (alarm set values of ID number, cumulative dose equivalent and dose equivalent ratio) of the dosimeter 100, which are displayed on the display 125. The calibration parameters Sensitivity, Counting Time, and Dead Time can also be changed. The dosimeter 100 becomes active from the time when the variables are changed in the user mode, and the cumulative dose equivalent and dose equivalent ratio are displayed.

Hereinafter, the dosimeter 100 operating in the manager mode will be described. First, CAL + cps is displayed on the display unit 125 using the mode key, and time is set one segment by the INC and DIG keys. When the mode key is pressed after setting the time, the pulse is counted for the set time and the final count value is displayed on the display unit 125 for 3 seconds, and after 3 seconds, the average value is displayed on the display unit 125 with cps. If you do not change the set time, the count is reset to zero and repeats continuously. This repetitive operation is stopped by pressing the mode key, and when stopped, the time is reset to 00 | 00 and the count value is reset to zero.

Summarizing the matter common to each mode of the dosimeter 100 described above,

① The dose equivalent value is displayed every 3 seconds, and the cumulative dose equivalent is displayed every 1 μSv increase.

② Green and red LEDs are emitted during infrared communication.

③ The o mark is periodically emitted to the display unit 125 to inform the active state.

④ The battery is checked every 10 minutes and when the battery is consumed, the battery indicator is displayed on the display unit 125.

⑤ When the mode key is pressed once, the display screen changes in the order of DOSE-> DOSE RATE-> ALARM + H-> ALARM + H + o-> ID-> CAL + H-> CAL + o-> CAL + H + o do.

⑥ The cumulative dose equivalents and dose equivalent ratios are expressed as H and H + o, and the units are expressed as Sv and Sv / h. Changes in the subunits are automatically converted to the measured value: u-> m-> none.

The dosimeter 100 according to the embodiment of the present invention has the following values as default values.

ID number: 00000

Cumulative dose equivalent alarm value: 100 μSv

Dose equivalent alarm value: 100 μSv / h

Dead time: 1.00-4 sec

Correction factor: 7.00-3 μSv / count

Counting time: 00 | 00

Meanwhile, the dosimeter 100 according to the embodiment of the present invention displays an alarm in the following form.

① When accumulated dose equivalent alarm condition occurs, Alarm + H and red LED light up and short beep sound is generated.

② When dose dose rate alarm condition occurs, Alarm + H + o and red LED light on and short beep sound is generated.

Referring to the variable change process of the dosimeter 100,

To change the numerical value, the MODE key, INC key, and DIG key are installed on the front of the dosimeter 100. The operation mode is set by the MODE key, and the numerical value is changed by the UP key, and the movement of the digit is moved from right to left by using the SH key.

The ID number may be changed from 00000 to 99999 by first displaying an ID on the display unit 125 with a Mode key.

Alarm set value is displayed by pressing Mode key to display Alarm + H or Alarm + H + o and change the value.

Dead time is indicated by CAL + H displayed first with Mode key, and numerical value is changed to form #. ##-#, and the unit is processed separately.

The correction factor is a mode key so that CAL + o is displayed on the display unit 125 and the numerical value is changed into a #. ##-# form and the unit is processed separately.

The counting time is indicated by CAL + cps displayed with the Mode key, and the numerical value is displayed on the four segments in front of the LCD, and has a form of 00 | 00. The first two segments show time, the latter two minutes, and you can change the time from 99 to 99.

Hereinafter, the radiation dose calculation method will be described. First, the calculation of the dose equivalent and the dose equivalent ratio accumulated in the dosimeter 100 is calculated according to the following requirements. When the terms used in the following calculation are summarized, H is the dose. Equivalent (Sv), Ho is the dose equivalent rate (Sv / h), Is the time (sec) at which the first pulse was measured, and td is the dead time (sec) of the detector and the electronic circuit, respectively. Ro is the measured coefficient value (cps), R is the td-corrected coefficient value (cps), C is the correction factor (μSv / cps) of the instrument, and E is the natural level dose equivalent rate (H (10)). Indicates.

Meanwhile, the calculation of dose equivalent and dose equivalent ratio accumulated in the dosimeter 100 is calculated according to the following requirements and displayed on the display unit 125.

① To measure the dose equivalent rate of the natural level, measure the time when the first pulse enters.

② Natural levels below 0.2 μSv / h are not included in the cumulative dose equivalent calculation, but the dose equivalent ratio is calculated.

③ Consider dead time of electronic circuit for correction of high dose equivalent rate measurement.

– Measure the measurement time of the first pulse;

-E = C / If x 3600 <0.2 μSv / h, do not include cumulative dose calculation

-Calculation of measured coefficients; ro = 1 /

④ Calculate average count value per second by counting for 3 seconds when Ro> 1

⑤ calculation of correction factor; R = Ro / (1-Ro x td)

⑥ cumulative dose equivalent calculation; H = R x S

⑦ Calculation of dose equivalent rate; Ho = R x S x 3600

Hereinafter, the configuration and operation of the reader 200 performing data communication with the dosimeter 100 will be described.

First, the reader 200 transmits and receives the accumulated dose dose, personal ID, and alarm setting values of the individual measured by the dosimeter 100 between the dosimeter 100 and the system management computer 300, and transmits the values of the system management computer 300. It controls access control system according to control signal and provides data input function to user. In order to perform this role, the electronic circuit of the reader 200 is designed and manufactured as shown in the block diagram of FIG. 8.

8 is a block diagram of a reader 200 according to an embodiment of the present invention, FIG. 9 is a detailed circuit diagram of the main board constituting FIG. 8, and FIG. 10 is a specific circuit diagram of the sub board constituting FIG. 8, respectively. It is shown.

First, the reader 200 according to the embodiment of the present invention is designed by dividing the main board and the sub board using two microprocessors 210 and 240 as shown in FIG. 8. The microprocessor 210 of the main board includes functional blocks 215 and 225 for data transmission and reception between the dosimeter 100 and the system management computer 300, a keypad 235 as a user input device, and a graphic LCD display for interactive use. It controls the entire reader 200, such as the control of 230, the microprocessor 240 of the sub-board controls the various input and output devices, such as the output of the control signal for access control in a predetermined area, Communication between the two boards is by serial communication. The microprocessors 210 and 240 used in the reader 200 of the present invention are AT90S8535 chips of a low power RISC structure manufactured by Atmel, and have 8 kbytes of flash memory, 512 bytes of EEPROM, and 512 bytes of SRAM, and the operation speed is 8 MHz. to be.

Hereinafter, the main board of the reader 200 will be described with reference to FIG. 9. The circuit of the main board for controlling the entire reader 200 can be designed as shown in FIG. 9 with respect to the microprocessor 210. In FIG. 9, a graphic LCD display 230 having a size of 256 x 64 dots is driven to the PA0 to PA7 terminals, and the PC3 to PC5 terminals are connected to control the LCD display 230. The keypad 235 is a ten number key and six function keys for other operations. A total of 16 keys are connected to the PB4 to PB7 terminals and the PD4 to PD6 terminals. The communication unit 225 is a device for wirelessly communicating with the dosimeter 100 and is made in an infrared manner. Since the asynchronous communication method is used, one infrared diode for transmission and one photo transistor are used for connection to PB3, PD3, and PC0 terminals. The PB6 and PB7 terminals are connected to an EEPROM 220 to expand memory for storing data. An RS-422 serial communication port 215 for communicating with the system management computer 300 is connected to the PD0 and PD1 terminals, and a card detection switch for recognizing the insertion of the dosimeter 100 is provided.

On the other hand, the sub-board that serves to control various input and output can be designed as shown in Figure 10 centering on the microprocessor (240). First, five LEDs for informing the user of the operation state of the reader 200 are connected to the PD4 to PD7 terminals, and the five relays are arranged to output control signals such as access control using the PC3 to PC7 terminals. Applicability between the 200 and the external device was expanded, and five input terminals 250 were configured on the PB0 to PB4 terminals by using a photo coupler to connect and apply various sensors to the reader 200. In addition, a voice reproducing IC 260 is connected to the PA2 to PA7 terminals to recognize the presence of the reader 200 to the person when the sensor of the input terminal 250 of the reader 200 recognizes the person, and is connected to the PC2 terminal. The buzzer 260 notifies the operation state of the reader 200 by sound. The PA0 and PA1 terminals are connected to sense the state of charge of the battery used, and there is a battery charging circuit for stably supplying the DC power of the reader 200.

Hereinafter, the operation of the reader 200 will be described. First, the operation of the reader 200 is divided into when the user enters and exits the entrance area.

11 illustrates the operation of the reader 200 when the dosimeter 100 user enters the entrance area.

First, when the dosimeter 100 is mounted on the reader 200, the limit switch of the reader 200 is contacted. In this case, the reader 200 checks the presence of the dosimeter 100 (step 400) and checks whether the entrance area is entered or exited (step 405) and outputs a confirmation number input message on the LCD display 230 when it is determined that the entrance is made. In operation 410, if the user inputs a confirmation number, the operation number input message is output in operation 415. When the job number is input, the reader 200 transmits the confirmation number and the job number to the system management computer 300 (step 420). Then, the system management computer 300 checks the confirmation number and the operation number, and if it matches, transmits the confirmation number, the accumulated dose equivalent alarm value, the dose equivalent rate alarm value, and the working time alarm value to the reader 200. The reader 200 receives the data sent from the system management computer 300 (step 425), sets the received data to the dosimeter 100, and the dosimeter 100 has a cumulative dose equivalent and a dose equivalent ratio of "0". It is set to start the normal operation in the active state (step 430). Thereafter, the reader 200 outputs an admission permission message on the LCD display 230 (step 435), and then outputs an access control signal through the relay (step 440). If the system management computer 300 does not match the confirmation number and the job number, the discrepancy signal is transmitted to the reader 200. When the system management computer 300 receives the mismatch signal, the reader 200 displays the LCD display 230. A message to disallow entry is displayed.

Hereinafter, the operation of the reader 200 at the exit of the entrance area will be described with reference to FIG. 12. First, when the user attaches the dosimeter 100 to the reader 200 at the exit of the entrance area, the limit switch of the reader 200 is contacted. In this case, the reader 200 confirms the presence of the dosimeter 100 and sends a communication start signal to the dosimeter 100. In response to the communication start signal input, the dosimeter 100 transmits the ID to the reader 200. The reader 200 sends the confirmation number to the system management computer 300 to confirm that it is the confirmation number (ID) that was entered. In this case, the system management computer 300 transmits a coincidence signal to the identification surface reader 200 with the entered confirmation number. This allows the reader 200 to check the ID of the dosimeter 100 that has been entered (step 450).

Then, the reader 200 receives the cumulative dose equivalent input from the dosimeter 100 (step 455) and transmits it to the system management computer 300, and the dosimeter 100 sends the confirmation number and the accumulated dose to the reader 200. The reader 200 then sends an initialization signal to the dosimeter 100 to initialize the dosimeter 100 (step 460). Accordingly, the confirmation number, the cumulative dose equivalent alarm value, the dose equivalent rate alarm value, and the working time alarm value of the dosimeter 100 are initialized. On the other hand, the reader 200 transmits the ID and cumulative dose of the dosimeter to the system management computer 300 (step 465), and outputs an access control signal through the relay (step 470). The entrance control signal keeps the door of the facility control device open or closed.

For reference, FIG. 13 illustrates an external perspective view of a reader 200 according to an embodiment of the present invention. The appearance of the reader 200 is arranged in the left side of the insertion port of the dosimeter 100 for communication with the dosimeter 100 in consideration of the user's convenience, and the five LEDs for providing information to the operating state of the reader and the user, And the graphic LCD for displaying English messages and the keypad for inputting data are placed on the right side, and the input and output terminals for extending the applicability of the reader are installed on the rear side.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and changes are possible in the art without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge. Therefore, the scope of the invention should not be defined by the described embodiments, but should be defined by the claims and their equivalents.

As described above, since the present invention can localize an electronic personal exposure dosimeter and an access control system including the same, the radiation based on the development base technology of the domestic radiometer and the design, manufacture and commercialization of the radiometer are obtained and used in the domestic nuclear field. The localization of the measuring instrument can achieve the effect of import substitution, and can be certified by the international organizations related to nuclear protection in the field of radiation protection, as well as improving the public's trust by securing radiation stability of nuclear workers. In addition, the present invention has the advantage of easy connection with the facility control device, including the door. In addition, in terms of the function of the dosimeter, the user can set the variable to operate as the dosimeter itself and have the advantage of easy calibration.

Claims (10)

An electronic personal exposure dosimeter which displays the exposure amount according to the radiation detection, generates an alarm according to the comparison of the set alarm set value and the exposure amount, and transmits and receives data with the reader according to the setting mode; Controlling messages and facility control devices that send and receive accumulated dose doses, individual IDs, and alarm settings of an individual between a connected dosimeter and a system management computer, and permit or control entry and exit according to signals input from the system management computer. A reader for outputting an access control signal for Process and analyze the data received from the reader to produce a variety of statistical data, and displays the system operation status on the display unit and comprises a system management computer for generating signals necessary for system control, such as control of a plurality of readers and dosimeters Access management system characterized by. The device of claim 1, wherein the reader; At least a main microprocessor having an infrared communication unit and a serial communication unit for transmitting and receiving data with each of the dosimeter and the system management computer, and for controlling a general operation of a display unit for displaying a system operation state and a keypad for receiving a user command; With main board, Voice synthesis integrated circuit and buzzer for notifying the status of the reader and notifying the presence of the reader by voice when recognizing a person through a sensor, an input / output terminal for transmitting and receiving a signal with the facility control device, and the main micro And a sub-board including at least a sub-microprocessor for generating a signal for controlling the facility control device according to the control of the processor. The access management system of claim 2, wherein the main board and the sub board transmit data by serial communication. The access management system according to claim 1 or 2, wherein the reader further comprises a switch switched on and off depending on whether the dosimeter is mounted. The apparatus of claim 4, wherein the reader; If it is determined that the dosimeter is installed, the user is asked for a confirmation number and a job number, and if there is an input, the user is sent to the system management computer, the received data is set in the dosimeter, and an admission permission message is displayed on the display unit. Output box as well as the access control signal according to the access control system, characterized in that for outputting to the facility control device. The apparatus of claim 4, wherein the reader; If it is determined that the dosimeter is exited, it receives a confirmation number from the dosimeter and transmits it to the system management computer. When a matching signal is received in response, a received dose is received from the dosimeter and transmitted to the system management computer. Access control system, characterized in that for outputting to the facility control device. 7. The access control system according to claim 6, wherein the reader initializes a confirmation number, an accumulated dose equivalent alarm value, a dose equivalent rate alarm value, and a working time alarm value set in the dosimeter when the user leaves the user. In the electronic personal exposure dosimeter, A PIN-junction silicon semiconductor detector for generating different levels of electrical signals by gamma radiation; A signal processor for forming a pulse of a signal output from the semiconductor detector, amplifying the pulse, and outputting the pulse; A microprocessor which displays the operation state of the dosimeter, the alarm display, and the exposure level according to the signal input from the signal processor and the signal input from the keypad, and controls to operate in an independent mode and a system mode; An infrared communication unit for communicating with a reader, A display unit which displays a system operation state under the control of the microprocessor; An alarm display unit driven under the control of the microprocessor; A keypad for calibrating the dosimeter and generating key data for setting the operation mode and setting the parameters, A power supply unit for supplying operation power; An electronic personal exposure dosimeter, characterized in that configured as a power check unit for checking the remaining battery power supply unit. 10. The electronic personal dosimeter of claim 8, wherein at least the correction factor, counting time, and dead time are changed by setting the manager mode in independent mode. The dosimeter of claim 8, wherein the dosimeter is operable alone by changing an ID number and an alarm set value by a user mode setting in independent mode.