KR100495538B1 - Multi-Dimensional pulse Time and Amplitude Recording System - Google Patents

Abstract

The present invention relates to a detection signal magnitude and an input time recording system and method of a radiation detector, wherein the magnitude of the signal detected by the detector and the input time of the signal are measured and recorded on the same time axis. It is a system and method for detecting signal size and input time of a radiation detector which can post-process the data and analyze the correlation between detectors as desired.

Description

 Detection signal magnitude and input time recording system and method of radiation detector {Multi-Dimensional pulse Time and Amplitude Recording System}

The present invention relates to a detection signal magnitude and an input time recording system and method of a radiation detector, wherein the magnitude of the signal detected by the detector and the input time of the signal are measured and recorded on the same time axis. The present invention relates to a detection signal size and an input time recording system and method of a radiation detector capable of post-processing data and analyzing correlations between detectors as desired.

Conventional radiation measuring method is to measure the amount of radiation by counting the number of pulses detected by the detector, and to generate a histogram (spectrum) by detecting the height of the pulse detected by the detector and by dividing the height into a predetermined interval to accumulate In this way, there is a way to know the radionuclide of the radioactive material. In addition, various attempts have been made to correlate two or more detectors in a radioactive material sample to determine the correlation between the radiations detected during the two detection periods.

Most of the methods directly process electrical signals, and perform logical sums or logical multiplications of the electrical signals with each other and count the results or apply them to spectral measurements to perform the desired measurements.

The disadvantage of this method is that the experimental device has already been determined in constructing the correlation between the detectors. Therefore, the result of the measurement should be calculated for only one correlation. .

In Korean Laid-Open Patent Publication No. 1995-0035534, at least one of the solid state radiation detectors is biased as a reference sensor, and the output of the reference sensor is read until the output reaches a predetermined threshold, and once the threshold is reached A timer determines when a predetermined X-ray exposure point ends, and upon completion, a solid radiation detector and a method of reading radiation detection information are described, wherein the sensor of the solid state radiation sensor is configured to be read.

U.S. Patent No. 5,144,141 discloses that each photodetector is electrically coupled to a respective detection and holding circuit for amplifying and storing a pulse generator by the photodetector, and the stored pulses are processed by memory signals from each detection and holding circuit. A plurality of internal gains which are then sampled by the multiple switching device to generate a digitized image signal corresponding to the position and energy level for the detected array of incident radiation, and then supplied to the display memory and the analysis device. A radiographic image device having a plurality of scintillator elements selectively coupled to an optical conductor is disclosed.

Korean Patent Laid-Open Publication No. 1996-7002114, which includes a first capacitive means including individual charge collection electrodes in a two-dimensional array, includes a second capacitive means including a radiation conversion means. The second capacitive means interacts with the first capacitive means and accumulates charges on the respective charge collection electrodes in accordance with the spatial distribution of the intensity of the radiation to which the radiation converting means is exposed. A radiation detector is described that includes a readout circuit for outputting a signal indicative of charge accumulated on a charge collection electrode.

Although the above-described radiation detector satisfies their purpose, it is very difficult to measure various correlations in the same radioactive material because the radioactive material has a basic property of decaying naturally over time. .

The present invention, in order to solve the problems as described above, the patent application No. 10-2002-0084680 of the applicant filed the method and apparatus for detecting the position of the pulse and the error of the patent application No. 10-2002-0084681 analog / digital converter Using the removal method and apparatus, the magnitude of the signal detected by the detector and the input time of the signal are measured and recorded on the same time axis. After performing one measurement, the measured data are post-processed to obtain correlation between the detectors. The purpose of the present invention is to provide a detection signal size and input time recording system and method of a radiation detector that can be analyzed and obtained as a result.

According to the present invention, the magnitude of the signal detected by the detector and the input time of the signal are measured and recorded on the same time axis. After performing one measurement, the measured data are post-processed to analyze the correlation between the detectors as desired. As the detection signal size and input time recording system and method of the radiation detector,

In the method of measuring the radiation emitted from the radioactive material, various approaches are possible in the method of measuring and analyzing the radiation by precisely measuring the energy of the radiation and the time at which the radiation is emitted.

The basic concept is to apply multiple reference detectors to a single sample of radioactive material and to record the energy of the radiation measured by each detector and the time of the corresponding input pulse accurately. The correlation between the data measured at can be analyzed accurately.

The present invention according to the above basic concept is composed of one timer (Timer) and three Time Amplitude Recorder (TAR) block,

The timer uses a 100 MHz oscillator with an error of 10 ppm or less as a reference clock, and makes time information using a 28-bit synchronous counter.

The TAR block is configured to input a pulse generated by a detector through an amplifier, and measure an input time of the pulse and a magnitude of the input pulse with respect to the input pulse.

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

1 is a system configuration diagram according to the present invention, FIG. 2 is a detailed configuration diagram of the system according to the present invention, FIG. 3 is a block diagram showing a magnitude and an input time recording method according to the present invention. 5 is a block diagram showing a processing procedure of the system according to the present invention, and FIG. 5 shows a block diagram showing an embodiment according to the present invention, the detector 1, the preamplifier 2, the main amplifier 3, the timer. 100, oscillator 101, synchronous counter 102, TAR block 200, buffer amplifier 201, pulse detector 202, sampling device 203, pulse holding device 204, ADC 205 , Recording device 206, buffers 207 and 208, data formatter 209, controller 210, storage device 211, measurement time generator 212, input step 300, detection step 310, measurement Step 320, recording step 330, conversion step 340, formatting step 350, storage step 360, and host computer 400 are shown.

1 and 2 show a detection signal magnitude and an input time recording system of a radiation detector according to the present invention configured as the above system.

A timer 100 for generating a reference time comprising an oscillator 101 of 100 MHz and a 28-bit synchronous counter 102 having an error of 10 ppm or less as a reference clock; The pulses (signals) generated by the detector (1) are connected to the timer (100), respectively, and the input time of the pulses and the input pulses (signals) It consists of three TAR (Time Amplitude Recorder) blocks 200 configured to measure size (see Figure 1).

The timer 100 uses a 28-bit synchronous counter to minimize the error between the most significant bit (MSB) and the least significant bit (LSB) in intercepting the time at the time of pulse input. The frequency of the reference pulse to be used to selectively use 100MHz and 10MHz, so that it is reset once every 2.68 seconds and 26.8 seconds at 100MHz and 10MHz,

In the case of 100MHz, the pulse measurement time increases constantly within 2.68 seconds, and after 2.68 seconds, the time starts again from zero, which should be considered when analyzing the data. In order to maintain the accuracy and stability of the reference time and to use the high-speed clock pulses for precise time measurement, and to maintain accurate timing in reading the pulse time, these functions, except for the clock pulse generator, enter one integrated circuit. Is designed to

The TAR block 200 includes a buffer amplifier 201 which is measured by the detector 1 and amplifies and shapes the preamplifier 2 and the main amplifier 3 to stabilize input pulses (signals);

A pulse detector (202) connected to the buffer amplifier (201) for detecting the exact position of the stabilized pulse through the buffer amplifier (201); A sampling device (203) connected to the pulse detector (202), for sampling a peak level (height) of a pulse based on the position of the pulse detected by the pulse detector (202); A pulse strecher (204) connected to the sampling device (203) for maintaining a precise level (height) of pulses sampled by the sampling device (203) for a predetermined time; 12 bit SAR (successive approximation), which is connected to the pulse holding device 204 and whose conversion time for converting the height (magnitude) of the pulse detected by the pulse holding device 204 into a digital value, is 8 ms. a register (Analog to Digital Converter) 205; It is connected to the pulse detector 202 and the timer 100, using the signal generated by the pulse detector 202 to obtain information about the 28-bit time (pulse input time) output from the timer 100 A recording device 206 for latching; A pulse size (height) storage buffer 207 for storing the height (12 bits) and the time (28 bits) of the pulse detected by the ADC 205 and the recording device 206, and a buffer for storing the input time of the pulse ( 208); A data formatter 209 connected to the buffers 207 and 208 for converting a 12-bit pulse size digital value and a 28-bit pulse input time into a 40-bit data format stored in the buffers 207 and 208; A storage device 211 connected to the data formatter 209 and continuously storing data in a 40-bit data format through the controller 210 through the data formatter; Measurement time generator 212 is connected to the pulse detector 202, the ADC 205, the data formatter 209 and the controller 210, the user to set the radiation detection time to be measured for a set time Consisting of (see Figure 2)

The buffer amplifier 201 stabilizes the pulse input from the detector 1, and sets the input impedance to 100 Ω or more, and deforms the waveform even when the full width at half maximum (FWHM) of the input pulse is 1 Hz. To have a bandwidth that is not equal to

The pulse detector 202 is a one-differentiated pulse of the pulse (signal) generated by the detector (1) using the method and apparatus for detecting the position of the pulse of patent application No. 10-2002-0084680, the applicant filed previously It is to accurately measure the input time of pulse by comparing the time derivative and the inverted pulse to obtain the time of the point where the two signals cross each other.

The reference point of the pulse time is the highest point of the pulse height so that the relative time position between successive pulses does not fluctuate. The information on the pulse time position is output as + 5V logic pulse or + 12V logic pulse and the edge of the output signal ( on the edge)

The pulse holding device 204 is a part for maintaining the relative height of the pulse for a predetermined time to change the position based on the peak of the pulse, the holding time of the selected height longer than the conversion time of the ADC 205 ,

The ADC 205 converts the height of the pulse detected by the pulse holding device 204 into a binary digital value, with a resolution of 12 bits, a conversion time of 10 ms or less, and a time used during conversion. Information about the output,

The patent application No. 10-2002-0084681 filed by the present applicant using an error elimination method and apparatus of the analog / digital converter, to eliminate the error (differential error) generated when converting the input pulse into a digital signal,

The pulse size (height) storage buffer 207 is a storage space temporarily stored so that information about the magnitude (height) of the pulse converted into binary numbers can be processed before the next pulse is input and the conversion is completed. It must be stored from the time when the conversion of the pulse height is completed to before the completion of the conversion of the next pulse height.

The controller 210 makes a start and completion signal by comparing the time set in order to measure the radiation pulse through the pulse detector 202 for the time set by the user and the measurement time generating device 212,

The storage device 211 uses a DRAM (DRAM; DYNAMIC RAM) module and is configured to measure 12.8 million pulses per channel using 128 MBytes per channel, so that additional memory modules can be used later.

The detection signal magnitude and input time recording method of the radiation detector according to the present invention, as shown in Figures 2 and 3,

An input step 300 for receiving a pulse (signal) generated by the detector 1, a detection step 310 for detecting an accurate input time of the pulse input in the input step 300, and the detection step 310 Measurement step 320 for measuring the exact height (size) of the pulse detected in the step and the recording step for recording the time information generated by the timer 100 using the input time detected in the detection step (310) 330, a conversion step 340 of converting the height (magnitude) of the pulse measured in the measurement step 320 into a digital value, and the pulses converted and recorded in the conversion step 340 and the recording step 330. Formatting step 350 for converting the data of the size (12bit) and the input time (28bit) into a data format of a certain format (40bit), and the data converted to a constant data format in the formatting step 350 continuously In the radiation detector through the storage step 360 of storing in the memory (DRAM) The magnitude and input time of the detected signal are recorded (see Fig. 3).

The three pulses are processed independently through the above-described processing method, and since the timer 100 composed of the oscillator 101 and the synchronous counter 102 is commonly used, The input time of the incoming pulse is measured on the same basis (see Fig. 4).

Looking at the embodiment, as shown in Figures 2 and 5,

The pulse inputted to one radiation detector 1 is amplified and shaped by the preamplifier 2 and the main amplifier 3, and when the pulse is input to the present system, the pulse is input by the buffer amplifier 201. After stabilization, the pulse detector 202 detects the exact position of the pulse. The pulse height is measured by the sampling device 203 based on the position of the pulse detected by the pulse detector 202, and the pulse stretcher 204 measures the exact height of the pulse for a predetermined time. By holding it, the height of the pulse detected by the ADC 205 is converted into a binary digital value, and the input time of the pulse is measured by the recording device 206. The detected pulse height and input time are temporarily stored in the pulse size storing buffer 207 and the pulse input time storing buffer 208, respectively, and before the next pulse is inputted, the Data Formatter 209. Is converted into a 40-bit data format and stored in the mass storage device 211.

After the above-described pulse size and input time detection process is completed, the controller 210 transmits 40-bit data (pulse size and input time information) stored in the storage device 211 to the host computer 400, thereby providing a host computer ( 400) to analyze the data sent.

In addition, the controller 210 controls measurement start and measurement completion based on the time measured by the measurement time generator 212 in order to accurately control the measurement time of the data.

The present invention enables various approaches in the radiometric measurement and analysis method by precisely measuring the energy of the radiation emitted from the radioactive material and the time at which the radiation is emitted, and common to each detector for one radioactive material sample. By applying the applied reference time generator, and accurately recording the energy of the radiation measured by each detector and the time for the input pulse, it is possible to accurately analyze the correlation between the data measured by the multiple detectors.

 1 is a system configuration according to the present invention

 2 is a detailed configuration diagram of a system according to the present invention.

 3 is a block diagram showing a method of recording a magnitude and an input time of a detection signal according to the present invention;

 4 is a block diagram illustrating a processing procedure of the system according to the present invention.

 5 is a block diagram illustrating an embodiment according to the present invention.

<Description of Drawing>

Detector (1), Preamplifier (2), Main Amplifier (3), Timer (100), Oscillator (101), Synchronization Counter (102), TAR Block (200), Buffer Amplifier (201), Pulse Detector (202) Sampling device 203, pulse holding device 204, ADC 205, recording device 206, buffers 207, 208, data formatter 209, controller 210, storage device 211, measurement time generation Device 212, input step 300, detection step 310, measurement step 320, recording step 330, conversion step 340, formatting step 350, storage step 360, host computer ( 400)

Claims (11)

In the detection signal size and input time recording system of the radiation detector, a reference time is composed of an oscillator 101 of 100 MHz and a 28-bit synchronous counter 102 having an error of 10 ppm or less as a reference clock. One timer (100) for generating a; The pulses (signals) generated by the detector (1) are connected to the timers (100), respectively, and are configured to measure the input time of the pulses and the magnitude of the input pulses (signals) with respect to the pulses input through the amplifier (2). The detection signal magnitude and input time recording system of the radiation detector, characterized in that consisting of three TAR (Time Amplitude Recorder) block (200). 2. The timer 100 of claim 1, wherein the timer 100 uses a 28-bit synchronous counter to intercept the time at the input of a pulse to determine the most significant bit (MSB) and least significant bit (LSB). Minimize the error and selectively use the frequency of the input reference pulse 100MHz and 10MHz, so that it is reset every 2.68 seconds and 26.8 seconds at 100MHz and 10MHz, When using 100 MHz, the pulse measurement time increases constantly within 2.68 seconds, and the time starts again from 0 after 2.68 seconds, adding a period of time to the entire time to maintain a consistent flow of time. It is designed to maintain the accuracy and stability of the reference time, to use the high-speed clock pulse for precise time measurement, and to have the function to maintain the accurate timing in reading the pulse time into one integrated circuit. The detection signal magnitude and input time recording system of the radiation detector. The buffer amplifier 201 of claim 1, wherein the TAR block 200 is measured by the detector 1 and amplified and shaped through the preamplifier 2 and the main amplifier 3 to stabilize the input pulse (signal) 201. )Wow; A pulse detector (202) connected to the buffer amplifier (201) for detecting the exact position of the stabilized pulse through the buffer amplifier (201); A sampling device (203) connected to the pulse detector (202), for sampling a peak level (height) of a pulse based on the position of the pulse detected by the pulse detector (202); A pulse strecher (204) connected to the sampling device (203) for maintaining a precise level (height) of pulses sampled by the sampling device (203) for a predetermined time; 12 bit SAR (successive approximation), which is connected to the pulse holding device 204 and whose conversion time for converting the height (magnitude) of the pulse detected by the pulse holding device 204 into a digital value, is 8 ms. a register (Analog to Digital Converter) 205; Connected to the pulse detector 202, using the signal generated by the pulse detector 202 to record the information (input time of the pulse) of the 28-bit time output from the timer 100 A recording device 206; A pulse size (height) storage buffer 207 for storing the height (12 bits) and the time (28 bits) of the pulse detected by the ADC 205 and the recording device 206, and a buffer for storing the input time of the pulse ( 208; A data formatter 209 connected to the buffers 207 and 208 for converting a 12-bit pulse size digital value and a 28-bit pulse input time into a 40-bit data format stored in the buffers 207 and 208; A storage device 211 connected to the data formatter 209 and continuously storing data in a 40-bit data format through the controller 210 through the data formatter; Measurement time generator 212 is connected to the pulse detector 202, the ADC 205, the data formatter 209 and the controller 210, the user to set the radiation detection time to be measured for a set time The detection signal size and input time recording system of the radiation detector, characterized in that consisting of. delete 4. The pulse detector 202 of claim 3, wherein the pulse detector 202 compares the one-differentiated pulse of the pulse (signal) generated by the detector 1 with the one-differentiated and inverted pulse to determine the time at which the two signals cross each other. By accurately calculating the input time of the pulse, The reference point of the pulse time is the highest point of the pulse height so that the relative time position between successive pulses does not fluctuate. The information on the pulse time position is output as + 5V logic pulse or + 12V logic pulse and the edge of the output signal ( A detection signal magnitude and an input time recording system of a radiation detector characterized by realizing visual information on an edge). The method of claim 3, wherein the pulse holding device 204 is a portion for maintaining the relative height of the pulse for a predetermined time to change the position relative to the peak of the pulse, and the holding time of the selected height ADC (205) The detection signal magnitude and input time recording system of the radiation detector, characterized in that it is configured to be longer than the conversion time. 4. The ADC 205 converts the height of the pulse detected by the pulse holding device 204 into a binary digital value, with a resolution of 12 bits and a conversion time of 10 ms or less. And an input time recording system according to claim 12, characterized in that the information on the time used during operation is outputted. 4. The buffer of claim 3, wherein the buffer for storing the pulse size (height) is temporarily stored so that information about the magnitude (height) of the pulse converted into binary can be processed before the next pulse is input and the conversion is completed. And a storage space for storing the detected signal size and input time of the radiation detector, characterized in that it is stored from the time when the conversion of the pulse height is completed to just before the conversion of the next pulse height is completed. 4. The method of claim 3, wherein the controller 210 starts and finishes the measurement time generating device 212 by comparing the time set in order to measure the radiation pulse through the pulse detector 202 during the time set by the user. And an input time recording system of a detection signal magnitude of a radiation detector, characterized in that it is configured to generate a signal. The system of claim 3, wherein the storage device 211 uses a DRAM (DRAM) module and uses 128 MBytes per channel, and uses 5 bytes per pulse to configure 16 million pulses per channel. And a detection signal size and an input time recording system of the radiation detector, wherein the memory module is configured to be used later. In the method for recording the detection signal size and the input time of the radiation detector, an input step 300 for receiving a pulse (signal) generated by the detector 1 and an accurate input time of the pulse input in the input step 300 are provided. A detection step 310 for detecting, a measurement step 320 for measuring the exact height (size) of the pulse detected in the detection step 310, and a timer using the input time detected in the detection step 310 A recording step 330 for recording the time information generated at 100, a conversion step 340 for converting the height (magnitude) of the pulse measured in the measurement step 320 into a digital value, and the conversion step ( 340 and the formatting step 350 for converting the data of the pulse size (12bit) and the input time (28bit) converted and recorded in the recording step 330 into a data format of a predetermined format (40bit), and the formatting step Continuously convert the data converted into a certain data format at 350 The detection signal size and input time recording method of the radiation detector, characterized in that the storage step of storing in the memory (DRAM) (360).