KR100860484B1 - Large-area, multi-segmented, two-dimensional, position-sensitive proportional, gas injection type counter - Google Patents

Abstract

The present invention relates to a gas-injected large-area multi-segmented two-dimensional position sensitive proportional counter, and more specifically, to a single proportion by multi-dividing a printed circuit board (PCB) inside the proportional counter. The present invention relates to a proportional counter having a multi-divided printed circuit board inside the counter and having the same effect as having a plurality of counters. When the proportional counter according to the present invention is used, the counting rate can be significantly increased, and accordingly, a large area counter can be easily manufactured, and the stability, position resolution, etc. of the counter can be increased.

Multi-Segmentation, Two-Dimensional, Position-Sensitive, Proportional Counter, X-Ray Spectrometer

Description

Large-area multi-segment two-dimensional position sensitive proportional counter {Large-area, multi-segmented, two-dimensional, position-sensitive proportional, gas injection type counter}

1 is a structural diagram showing the geometrical appearance of a conventional multi-ray scaffold counter and incident X-rays.

2 is a schematic structural diagram of a proportional counter according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating an example in which a printed circuit board on which a cathode ray and an anode ray are arranged is multi-divided in a proportional counter according to an embodiment of the present invention. From the left, each printed circuit board is divided into 2, 4, and 8 slices.

FIG. 4 is a diagram illustrating an X-ray photograph taken using an X-ray detector to which a dual segmented two-dimensional position sensitive proportional counter manufactured according to an embodiment of the present invention is applied. The top picture is the sample, and the picture below shows the result of the picture.

<Description of the symbols for the main parts of the drawings>

1: Body frame in which incident surface (window) is arranged on the side to which radiation is incident

2: lower cathode

3: anode wire

4: upper cathode wire or cathode strip

5: proportional counter cover

10: X-ray irradiation 20: Lower cathode ray

30: anode wire 40: upper cathode wire

50: drift electrode 60: amplifier

The present invention relates to a gas-injected large-area multi-segmented two-dimensional position sensitive proportional counter, wherein a plurality of counters are provided in one proportional counter by multiplying a printed circuit board (PCB) in the proportional counter. It is for a proportional counter that can exhibit the same effect as having.

1 is a view showing a state of the conventional proportional counter.

The proportional counter has a lower cathode line 20 and an upper cathode line 40 on both sides of the anode line 30. The anode line, the lower cathode line and the upper cathode line are formed by a conductive metal line and are disposed on a printed circuit board. The lower cathode line, the anode line and the upper cathode line disposed on the printed circuit board are fixed in order by the frame of the proportional counter, and gas is filled in the inside of the frame.

When the X-rays are incident on the proportional counter, the atoms of the filled gas collide with the X-rays and ionize. When the voltage is enough to cause an avalanche on the anode line, the ionization of the gas by the X-rays is increased. The number of ion pairs is increased. On the other hand, a delay line (delay-line) is provided at the ends of the lower cathode ray 20 and the upper cathode ray 40, the delayed time from the X-ray incidence position to the output signal position where the first transfer situation occurred As a result, it is possible to obtain an X-ray photograph by X-ray irradiation.

Conventional gas-injected two-dimensional position sensitive proportional counters have been mainly used when the detection area is small and the photon counting rate to be measured is low. However, recently, in the case of large-scale fusion devices and radiation accelerator devices, the number of emitted photons is increasing exponentially with the development of the device and the measuring method, and accordingly, the need for a large area counter for image measurement is increasing.

In the case where high photon counting rate measurement is required, conventional gas-injected two-dimensional position sensitive proportional counters have many limitations in their use because of limitations in measuring high photon counting rate.

Meanwhile, in the case of a two-dimensional position sensitive proportional counter, a cathode and an anode line are provided inside the cathode and anode lines, which are disposed on a printed circuit board. Further, the measurable area of the proportional counter is determined according to the area of the cathode and anode lines. Therefore, when manufacturing a large area two-dimensional position sensitive proportional counter with a large measurement area, a large area printed circuit board should be used. When defects are found in such a large area printed circuit board, it is difficult to correct the whole board. .

Accordingly, the present invention is to provide a large area proportional counter capable of measuring a high photon counting rate.

In addition, the present invention is to provide a proportional counter that can reduce the area of the proportional counter is a large area but the printed circuit board on which the cathode and anode lines are arranged.

The present invention also provides a method for easily fabricating a large area proportional counter that can dramatically increase the counting rate. The present invention also provides a proportional counter having improved stability and position resolution.

The present invention provides a radiation incident surface, an anode line disposed on a printed circuit board for a cathode ray, a lower cathode line disposed on a lower cathode line printed circuit board on one side of the anode line, and an upper cathode line disposed on a printed circuit board for upper cathode line on the other side of the anode line. In the proportional counter comprising: the anode line, the lower cathode line and the upper cathode line is formed by a plurality of conductive metal lines are disposed on the printed circuit board, respectively, the lower cathode line, anode line and the upper portion disposed on the printed circuit board The cathode ray is fixed in order by a frame having a radiation incident surface, and gas is filled in the inside of the frame, the anode line is connected to a power source, and a delay line (at both ends of the lower cathode line and the upper cathode line) delay-line) is connected, and the anode line, the lower cathode line and the upper cathode line are respectively At least one printed circuit board that is value provides a proportional counter, which is divided into two or more.

According to an example of the present invention, the proportional counter according to the present invention is a two-dimensional proportional counter capable of detecting X-rays irradiated in two dimensions. According to an example of the present invention, the radiation incident surface may transmit X-rays.

According to the exemplary embodiment of the present invention, the metal wire constituting the lower cathode ray and the metal wire constituting the upper cathode ray may be disposed with the lower cathode ray and the upper cathode ray so that the arrangement direction is perpendicular to each other.

Preferably, the proportional counter according to the present invention can be easily applied to the detection of X-rays irradiated in two dimensions.

According to one embodiment of the present invention, a structure in which only the lower cathode printed circuit board and the lower cathode ray and the upper cathode ray printed circuit board and the upper cathode ray are divided is possible. That is, according to another example of the present invention, the printed circuit board including the anode line may not be divided, and only the printed circuit board including the lower cathode line and the upper cathode line may have a divided structure.

According to another exemplary embodiment of the present invention, the printed circuit board and anode line for the cathode ray line, the printed circuit board for the lower cathode ray line and the lower cathode ray, and the printed circuit board for the upper cathode ray and the upper cathode ray may be divided. That is, it is also possible to multiply the anode line (including the printed circuit board for the anode line), and to divide the lower cathode line (including the lower cathode line printed circuit board) and the upper cathode line (including the upper cathode line printed circuit board).

According to another example of the present invention, the printed circuit board including the anode line may not be divided, and the printed circuit board may be configured such that the lower cathode line and the upper cathode line cross at right angles to each other.

In this case, it is also possible to arrange the crossed lower cathode line and the upper cathode ray line on one printed circuit board at a time in a state where the lower cathode ray and the upper cathode ray cross at right angles to each other.

That is, the present invention also provides a proportional counter including a radiation incident surface, an anode line, a lower cathode line and an upper cathode line, wherein the anode line, the lower cathode line and the upper cathode line are formed by a plurality of conductive metal lines to form a printed circuit board. The lower cathode line, the anode line and the upper cathode line disposed on the printed circuit board are fixed by a frame having a radiation incidence surface, and gas is filled in the frame, and the anode line is connected to a power source. Delay lines are connected to both ends of the lower cathode line and the upper cathode line, and the lower cathode line and the upper cathode line cross each other at right angles, and are disposed on a single printed circuit board. At least one of the printed circuit boards on which the cathode ray and the upper cathode ray are disposed is two or more. That is to provide a proportional counter.

According to an example of the present invention, at least one of the cathode lines may be configured as a cathode strip in the form of a strip.

In the present invention, the number of divisions of the printed circuit board is not limited. Proportionation counters can be produced by appropriate division as necessary. According to embodiments of the present invention, the printed circuit board may be divided into two, four or eight.

The shape or shape of the positive electrode, the negative ray and the printed circuit board may be easily modified and used by those skilled in the art of examining a sample or a subject by using X-rays.

In addition, those skilled in the art of examining a sample or a subject using X-rays can easily design, manufacture and use a suitable printed circuit board suitable for the proportional counter of the present invention as needed. will be.

In the present invention, the cathode wire and the anode wire may be made of a metal wire. There is no limitation on the type of metal wire that can be used. As long as it is an electrically conductive metal material, it can be used for the manufacture of metal wires without limitation. For example, gold, silver, aluminum, platinum, tungsten, and the like may be used, and of course, gold-coated tungsten and the like may be used.

The thickness of the metal wire and the distance between the metal wires may be applied to the thickness of the metal wires and the distance between the metal wires, which were used when manufacturing the proportional counter.

The gas filled in the proportional counter according to the present invention can be used without limitation the gas used when filling the conventional proportional counter. For example, argon, xenon, krypton and the like can be used without limitation.

According to the present invention, the printed circuit board, which is a core component inside the proportional counter, does not use a single large printed circuit board, but uses a multi-divided printed circuit board. It is characterized in that the built-in, so as to have the same effect as having the proportional counter of the multi-division number in one proportional counter.

An anode line or a cathode line (upper and lower) are respectively disposed on the printed circuit board, and the printed circuit board checks the position and the amount of incident X-rays and the like according to the electrical signals recognized by the anode line and the upper and lower cathode lines. I can make it. The electrical signal recognized by the anode line and the upper / lower cathode line is an electrical signal generated by ionized particles generated by collision of gas filled in the proportional counter with X-rays.

For the same detection area, when using a conventional proportional counter, only one printed circuit board used an electric signal for X-ray photons and ionized gas. In the proportional counter according to the present invention, the number of printed circuit boards divided by The X-ray photon and ionized gas can be used to duplicate the electrical signal.

As a result, considering that the area of each divided printed circuit board is reduced by multiple division, the amount of photons and electric signals inputted to the unit area printed circuit board is increased to enable more accurate measurement.

As a result, it is possible to significantly increase the counting rate and divide the printed circuit board, thereby making it possible to easily manufacture a large-area proportional counter. In addition, since the large area counter is multiplied, characteristics such as stability and position resolution of the counter can be significantly increased.

The proportional counter according to the present invention can be suitably applied to an apparatus for inspecting a sample or a subject by using X-rays. Those skilled in the art of examining a sample or a subject by using X-rays may easily apply the apparatus to a suitable apparatus and use suitable for the proportional counter of the present invention as necessary.

Specifically, the present invention also provides an X-ray detector with the proportional counter.

The present invention also provides a CT imaging apparatus having the proportional counter.

The present invention also provides a fusion plasma diagnostic apparatus having the proportional counter.

For example, the proportional counter of the present invention may be applied to an X-ray CT device. The X-ray CT device includes an X-ray generator and a two-dimensional X-ray area detector positioned opposite to the X-ray generator, wherein the proportional counter according to the present invention can be applied to the two-dimensional X-ray area detector. have. In the X-ray CT apparatus, X-rays are detected by rotating around the center of rotation between the X-ray generator and the two-dimensional X-ray area detector to detect the X-rays and the two-dimensional X- X-ray data collection means for collecting the X-ray projection data items that have passed through the subject lying between the ray area detectors, and projection data items collected by the X-ray data collection means for reconstructing the image. Image reconstruction means, image display means for displaying the reconstructed tomogram, external signal input means for receiving an external input signal, and phase data input means for achieving synchronization with the external input signal. The means is an X-ray detector data collected in synchronization with a specific phase of the external input signal from the X-ray detector data items collected during the scan. The image may be reconstructed by extracting the data item.

The proportional counter according to the present invention can be applied to other radiation imaging values. A radiation image pickup apparatus comprising a radiation irradiation means for irradiating radiation to a subject to be photographed and a two-dimensional radiation detector in which a plurality of radiation detection elements are arranged in a two-dimensional matrix, wherein the proportion of the two-dimensional radiation detector according to the present invention is proportional to the two-dimensional radiation detector. Counter can be applied.

Referring to the configuration and operation of the present invention in detail with reference to the accompanying drawings as follows.

2 shows an overall conceptual assembly view of the present invention.

FIG. 3 illustrates a double, quadruple and eight split printed circuit board and lower cathode, anode and upper cathode lines disposed on each printed circuit board. FIG. The present invention can be applied to a multi-division printed circuit board including a double, quad and arm division according to the use environment.

Figure 4 shows the results of the image experiments measured in a double-division two-dimensional position-sensitive proportional counter detector produced by test to confirm the operation of the present invention.

The operation of the present invention will be described by way of example with reference to the drawings. This exemplary description may be substituted for the embodiment.

As shown in FIG. 2, when radiation such as X-rays is incident through the window of the proportional counter of the present invention, a phenomenon in which atoms of gas filled inside the proportional counter collide with the X-rays and ionizes. On the printed circuit board for the positive wire, a plurality of metal wires made of, for example, gold-coated thin tungsten wires are arranged to form the positive wire 3, which is applied with a voltage such that an avalanche occurs on the positive wire. This increases the number of electron-ion pairs. A delay line is installed at both ends of the lower cathode ray 2 on the side where radiation is incident on the anode line and the upper cathode ray 4 on the opposite side of the anode line, and is output from the X-ray incident position. By measuring the time difference delayed to the signal, we know where the first avalanche occurred.

The method consists of an electronic circuit using a time-to-digital converter that measures the total delay time and the delayed time difference over the entire length of the position detection axis. If the lower cathode line and the upper cathode line are orthogonal to each other, and a delay line is installed, a proportional counter having a two-dimensional position resolution can be constructed. The lower cathode line and the upper cathode line can also be produced by placing a plurality of fine tungsten wires coated with, for example, gold on the printed circuit board for the lower cathode line and the printed circuit board for the upper cathode line. In some cases, the upper cathode ray may be a cathode ray or a cathode strip. It is also possible to combine the upper cathode ray and the lower cathode ray orthogonally to form one cathode ray.

3 shows a dual segmented printed circuit board designed according to the present invention. Depending on the area of the desired proportional counter and the photon counting rate, the desired number of multiple divisions is possible. The printed circuit board may be divided into, for example, two, four, and eight layers.

Figure 4 shows the results of the image experiments measured in a double-division two-dimensional position-sensitive proportional counter detector produced by test to confirm the operation of the present invention. The experiment is an X-ray image measurement result obtained after the 10 mCi Fe- 55 X-ray source was split at a distance of about 80 cm after attaching the nipper to the manufactured proportional counter. Since the measured nipper image is a double split proportional counter, it can be seen that it is divided into two parts. Therefore, it can be said that the test operation of the dual-division two-dimensional position sensitive proportional counter detector manufactured as shown in FIG.

Those skilled in the art will be able to produce proportional counter detectors in accordance with the present invention and variations thereof are possible.

According to the present invention, the printed circuit board in the proportional counter may be divided into multiple parts, thereby providing the same effect as having a plurality of proportional counters in one proportional counter. According to the present invention, it is possible to significantly increase the counting rate, as well as to improve stability and position resolution in a large area proportional counter.

The large-area multi-segmented two-dimensional position sensitive proportional counter according to the present invention can be used in the core components of X-ray spectroscopy and can greatly contribute to the field of basic scientific research such as fusion plasma diagnosis, astrophysics and many industrial applications.

Claims (12)

A radiation incident surface, an anode line disposed on a printed circuit board for a positive electrode line, a lower cathode line disposed on a lower cathode line printed circuit board on one side of the anode line, and an upper cathode line disposed on a printed circuit board for upper cathode line on the other side of the positive line In the proportional counter, The anode line, the lower cathode line and the upper cathode line are formed by a plurality of conductive metal lines and are respectively disposed on the printed circuit board. The lower cathode ray, the anode ray and the upper cathode ray disposed on the printed circuit board are fixed in order by a frame having a radiation incident surface. The inside of the frame is filled with gas, The anode line is connected to a power source, and a delay line is connected to both ends of the lower cathode line and the upper cathode line. And at least one of the printed circuit boards on which the anode line, the lower cathode line, and the upper cathode line are respectively disposed. The proportional counter of claim 1, wherein the metal wires constituting the lower cathode ray and the metal wires constituting the upper cathode ray are perpendicular to each other in an arrangement direction. The proportional counter of claim 1, wherein the radiation incident surface is capable of transmitting X-rays. The proportional counter of claim 1, wherein the proportional counter detects X-rays irradiated in two dimensions. The proportional counter according to claim 1, wherein only the lower cathode printed circuit board and the lower cathode ray and the upper cathode ray printed circuit board and the upper cathode ray are divided. The proportional counter of claim 1, wherein the positive electrode printed circuit board and the positive electrode line, the lower negative electrode printed circuit board and the lower negative electrode line, and the upper negative electrode printed circuit board and the upper negative electrode line are all divided. The proportional counter according to any one of claims 1 to 6, wherein the printed circuit board is divided into a double, a quadruple or an eight. The proportional counter of claim 1, wherein the metal wire forming the cathode ray is formed in a strip shape, and the cathode ray is formed in a cathode strip. A proportional counter comprising a radiation incident surface, an anode line, a lower cathode line and an upper cathode line, The anode line, the lower cathode line and the upper cathode line are formed by a plurality of conductive metal lines and are disposed on a printed circuit board. The lower cathode line, the anode line and the upper cathode line disposed on the printed circuit board are fixed by a frame having a radiation incident surface. The inside of the frame is filled with gas, The anode line is connected to a power source, and a delay line is connected to both ends of the lower cathode line and the upper cathode line. The lower cathode ray and the upper cathode ray cross each other at right angles and are disposed on one printed circuit board. And at least one of the printed circuit boards on which the anode line, the lower cathode line, and the upper cathode line are respectively disposed. X-ray detector with a proportional counter according to claim 1. A CT imaging apparatus having a proportional counter according to claim 1. A fusion plasma diagnostic apparatus having a proportional counter according to claim 1.

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