TWI688374B - Radiation measuring device and radiographic device - Google Patents

Abstract

A radiation measuring instrument includes a control unit. The control unit is based on The charging current flowing through the ionization box with the bias voltage and measured by the current measuring section determines whether the main body of the measuring instrument including the ionization box, the current measuring section, and the bias voltage applying section is normal.

Description

Radiation measuring device and radiographic device

The present invention relates to a radiation measuring device and a radiographic device, and particularly relates to a radiation measuring device and a radiographic device including an ionization box.

Previously, radiometers with ionization boxes were known. Such a radiation measuring device is disclosed in Japanese Patent Laid-Open No. 2014-54322, for example.

Japanese Patent Application Laid-Open No. 2014-54322 discloses an X-ray diagnostic apparatus including an X-ray generation unit that irradiates a subject with X-rays, and an X-ray detection unit that detects X-rays that penetrate the subject. This X-ray diagnostic apparatus is provided with an X-ray irradiation unit that radiates X-rays in an X-ray generation unit. In addition, the X-ray irradiation unit includes an X-ray tube, an X-ray movable aperture unit, and a dose measurement unit. The arrangement is to face the subject in the order of the X-ray tube, the X-ray movable aperture part, and the radiation amount measuring part. The X-ray tube is configured to emit X-rays. The X-ray movable aperture portion is configured to set the X-ray irradiation area irradiated by the X-ray tube. The radiation dose measuring section is configured to measure the energy (X-ray dose) possessed by X-rays passing through the X-ray movable aperture section.

The radiation dose measuring unit is provided with a detector using an ionization box, for example. Furthermore, the ionization box is a container having two metal plates (electrodes) facing each other. then, By injecting radiation into the ionization box, the gas (air, etc.) between the two metal plates is ionized, and the current flows between the two metal plates. This current is measured by a current measuring circuit, and thereby the X-ray dose can be obtained.

Here, according to the individual standard IEC60580 of the conventional radiation dose measuring unit (area radiation meter) described in Japanese Patent Laid-Open No. 2014-54322, it is required to install a stability check device on the area radiation meter. The stability checking device is a device for confirming the stability (the value does not drift, etc.) and the normality of the circuit (current measuring circuit, etc.) provided in the area radiometer. For example, a current source is provided in the stability checking device. Then, through the driving signal of the control circuit, the current source generates a current of a predetermined size. Next, the generated current flows through the current measurement circuit. The current measuring circuit measures the current flowing from the current source, and converts the measurement result into ray quantity information. Next, the control circuit determines whether the radiation amount information converted by the current measurement circuit is within a predetermined reference value range. Next, using the radiation amount information converted by the current measurement circuit, if it is outside the range of the reference value, the control circuit determines that the circuit (current measurement circuit, etc.) is abnormal.

However, as in the conventional area ray meter described in Japanese Patent Laid-Open No. 2014-54322, for stability check, it is necessary to provide a current source independent of the current measurement circuit or the like. For this reason, the area radiometer (radiation measuring device) has a problem of being large-sized and complicated.

The present invention provides a radiation measuring device and a radiographic device, in order to In order to solve the above-mentioned problems, an object of the present invention is to suppress the increase in size and complexity and to conduct stability checks.

In order to achieve the above object, the radiation measuring instrument according to the first aspect of the present invention includes: an ionization box including a first electrode and a second electrode that are arranged opposite to each other; and a bias voltage applying section that includes the first electrode and the second electrode A bias voltage is applied between them; a current measuring unit measures the ionization current generated by irradiating the ionization box with radiation; and a control unit based on the application of the bias voltage flows through the ionization box and uses the current The charging current measured by the measuring part determines whether the measuring device body part is normal. The measuring device body part includes the ionization box, the bias voltage applying part, and the current measuring part. Furthermore, the "charging current" means the total current that flows when the charge accumulated in the first electrode and the second electrode is discharged over time by applying a bias voltage between the first electrode and the second electrode. the amount.

The radiation measuring instrument according to the first aspect of the present invention, as described above, includes a control unit that judges based on the charging current that flows through the ionization box by applying the bias voltage and is measured by the current measuring unit Whether the gauge body part including the ionization box, the bias voltage applying part, and the current measurement part is normal, and the gauge body part. This makes it possible to determine whether the main body of the measuring device is normal based on the charging current caused by applying a bias voltage to the ionization box using the bias voltage applying portion provided in advance in the radiation measuring instrument. As a result, the stability check can be performed without additionally installing a current source. As a result, it is possible to perform the stability check while suppressing the increase in size and complexity. In addition, because the charging current measured by the current measuring unit is based on the bias voltage applied to the ionization box, the determination of whether the main body of the measuring device is normal is performed, except With the current measurement unit, it is also possible to determine whether the ionization box and the bias application unit are normal.

In the radiation measuring instrument according to the first aspect described above, preferably, the control unit is configured to charge the current measured by the current measuring unit based on the current flowing through the ionization box by applying the bias voltage. , And the amount of charging charge obtained from the static capacitance of the ionization box including the first electrode and the second electrode, to determine whether the main body of the measuring device is normal. With this configuration, the amount of charge in the ionization box can be easily calculated from the static capacitance of the ionization box including the first electrode and the second electrode, so it can be based on the charging current measured by the current measurement unit With the calculated static capacitance of the ionization box, it is easy to judge whether the body of the measuring device is normal.

In this case, it is preferable that the control unit is configured to be based on the first value of the charging current measured by the current measuring unit and the amount of the charging charge from the ionization box When the calculated difference between the second values exceeds a predetermined critical value, it is determined that the measuring device body is abnormal. With this configuration, it is possible to easily determine whether the measuring device body is normal based on a predetermined threshold value.

In the radiation measuring instrument in the first aspect described above, it is preferable that the control unit is configured to use the bias voltage application unit again after temporarily stopping the application of the bias voltage by the bias voltage application unit The bias voltage is applied between the first electrode and the second electrode to determine whether the main body of the measuring device is normal. With this configuration, the charge accumulated in the first electrode and the second electrode is discharged by temporarily stopping the application of the bias voltage. Therefore, because no electricity is accumulated in the first electrode and the second electrode The bias voltage is applied under the state of charge, so it is possible to accurately measure the charging current generated only by the application of the bias voltage. As a result, it can be suppressed that the first electrode and the second electrode are caused by charges accumulated by factors other than bias application (ionization by radiation, etc.), and it is erroneously judged whether the main body of the measuring device is normal (false judgment).

In the radiation measuring instrument in the first aspect described above, it is preferable that the radiation measuring instrument further includes an input section that receives an input, and the input is used to start an operation to determine whether the measuring instrument body section is normal. The control unit is configured to use the bias voltage applying unit between the first electrode and the second electrode when receiving a start command to determine whether the measuring device body is operating normally. The bias voltage is applied in between to determine whether the body part of the gauge is normal. With this configuration, by the user operating the input unit, it is possible to start the operation of judging whether the main body of the measuring device is normal at a time desired by the user.

A radiographic apparatus according to a second aspect of the present invention includes: a radiation irradiating unit that irradiates a subject; a radiation detection unit that detects radiation penetrating the subject; and a radiation measuring device provided in the radiation irradiating unit With the radiation detection unit, the amount of radiation radiated by the radiation irradiation unit is measured. The radiation measuring instrument includes: an ionization box including a first electrode and a second electrode that are arranged opposite to each other; a bias voltage applying part that applies a bias voltage between the first electrode and the second electrode; a current measuring part that measures transmission An ionization current generated by irradiating the ionization box with radiation; and a control section that judges the measuring instrument based on the charging current that flows through the ionization box by applying the bias voltage and uses the charging current measured by the current measurement section Whether the body part is normal, the body part of the measuring instrument includes the ionization box and the bias A voltage applying part and the current measuring part.

As described above, the radiographic apparatus according to the second aspect of the present invention includes the control unit based on the charge measured by the current measuring unit based on the flow of the ionization box through the application of the bias voltage. The current determines whether the main body of the measuring instrument including the ionization box, the bias voltage applying part, and the current measuring part is normal. Thus, it can be determined whether the main body of the measuring device is normal based on the charging current generated by applying a bias voltage to the ionization box using the bias voltage applying portion provided in advance in the radiation measuring instrument. As a result, the stability check can be performed without additionally setting a current source. Thereby, it is possible to provide a radiographic apparatus that suppresses the increase in size and complexity while performing a stability check. Also, because the charging current measured by the current measuring section is applied based on the bias applied to the ionization box, it is determined whether the main body of the meter is normal, and it is possible to provide a judgment that includes the current measurement section plus the ionization box and the bias applying section Whether it is a normal radiographic device.

In order to make the above-mentioned features and advantages of the present invention more obvious and understandable, the embodiments are specifically described below in conjunction with the accompanying drawings as follows.

1: X-ray photography device

2: X-ray irradiation department

3: flat panel detector

4: X-ray measuring device

5: Support Department

6: Subject

7: Top plate

21: Ray tube

22: Collimator

41: ionization box

41a: frame

41b: Incident side electrode

41c: Exit side electrode

42: Measuring substrate

43: Current measurement section

43a: I-V conversion unit

43b: amplifier

43c: V-F conversion unit

43d: counter

44: Bias application part

45: Control Department

46: Measuring instrument body

47: Input section

FIG. 1 is a schematic diagram showing the overall configuration of an X-ray imaging apparatus according to an embodiment.

2 is a diagram (cross-sectional view) showing the configuration of an X-ray measuring device according to an embodiment.

3 is a block diagram showing the configuration of the X-ray measuring device according to the embodiment.

4 is a diagram (cross-sectional view) showing the structure of an ionization box according to an embodiment.

FIG. 5 is a diagram showing a bias application unit according to an embodiment.

FIG. 6 is a block diagram showing the configuration of the current measurement unit according to the embodiment.

7 is a diagram for explaining the charging current.

8 is a block diagram for explaining the operation (stability check) of the current measurement unit according to the embodiment.

Hereinafter, embodiments of the present invention will be described based on the drawings.

(Configuration of X-ray imaging device)

The configuration of the X-ray imaging apparatus 1 according to the embodiment will be described with reference to FIGS. 1 to 8. In addition, the X-ray imaging apparatus 1 is an example of the "radiation imaging apparatus" of the patent scope.

As shown in FIG. 1, the X-ray imaging apparatus 1 includes an X-ray irradiation unit 2. The X-ray irradiation unit 2 is configured to irradiate the subject 6 with X-rays. Specifically, the X-ray irradiation unit 2 includes an X-ray tube 21. The X-ray tube 21 is configured to generate X-rays. In addition, the X-ray irradiation unit 2 includes a collimator 22. The collimator 22 is configured to limit the range of the X-ray beam generated by the X-ray tube 21 and diffused into a conical shape. For example, the collimator 22 cooperates with the shape (rectangular shape) of a flat panel detector (FPD) 3 that detects X-rays, and concentrates the range of the X-ray beam. Furthermore, the X-ray irradiation unit 2 is an example of a "radiation irradiation unit" within the scope of patent application.

The X-ray imaging apparatus 1 includes an FPD 3 that detects X-rays penetrating the subject 6. The FPD 3 is arranged below the subject 6 (with the X-ray of the subject 6 (The side of the line portion 2 is the opposite side). In addition, FPD 3 is an example of a "radiation detection unit" applying for a patent.

The X-ray imaging apparatus 1 includes an X-ray measuring device 4. The X-ray measuring device 4 is provided between the X-ray irradiation unit 2 and the FPD 3. Specifically, the X-ray measuring device 4 is provided below the collimator 22 (the X-ray emission port on the opposite side to the X-ray tube 21 side of the collimator 22, see FIG. 2 ). Next, the X-ray measuring device 4 is configured to measure the amount of X-rays irradiated by the X-ray irradiation unit 2. In detail, the X-ray measuring device 4 is configured to measure the area radiation amount of X-rays, and the X-rays are generated by the X-ray tube 21 and irradiated on the subject 6 via the collimator 22. In this way, the X-ray measuring device 4 is used to manage the amount of exposed radiation of the subject 6. In addition, the "area radiation dose" means the total radiation dose of the irradiation surface irradiated with X-rays, and the unit is "Gy.m ² ". In addition, the X-ray measuring device 4 is an example of a "radiation measuring device" that is subject to patent application.

In addition, the X-ray irradiation unit 2 and the X-ray measuring device 4 are supported by the support unit 5. The X-ray irradiation unit 2 and the X-ray measuring device 4 supported by the support unit 5 are configured to be movable relative to the subject 6.

In addition, the X-ray imaging apparatus 1 includes a top plate 7. The top plate 7 is configured such that the subject 6 lies on the surface of the top plate 7.

(Construction of X-ray measuring device)

Next, the configuration of the X-ray measuring device 4 will be described with reference to FIGS. 3 to 5.

As shown in FIG. 3, the X-ray measuring device 4 includes an ionization box 41 and a measurement substrate 42. The measurement substrate 42 is provided with a current measuring part 43, a bias applying part 44 and a control 制部45。 45. In addition, the ionization box 41, the current measuring part 43, and the bias voltage applying part 44 constitute the measuring device main part 46. In addition, the ionization box 41 is an example of the “ionization box” within the scope of patent application.

As shown in FIG. 4, the ionization box 41 includes a box-shaped frame 41 a. The frame 41a is formed of resin or the like, for example. In addition, the ionization box 41 includes an incident-side electrode 41b and an exit-side electrode 41c that are provided to face each other. The entrance-side electrode 41b and the exit-side electrode 41c are made of, for example, transparent electrodes such as indium tin oxide (ITO (Indium Tin Oxide)). In addition, the incident side electrode 41b is provided above the frame 41a, and the emission side electrode 41c is provided below the frame 41a. In addition, the ionization box 41 (frame 41a) is configured to be non-hermetic. That is, the housing 41a (between the incident side electrode 41b and the exit side electrode 41c) is filled with air. Furthermore, the transmission frame 41a is not hermetically sealed, and the air pressure of the air in the frame 41a is affected by the atmospheric pressure of the surrounding environment of the ionization box 41. That is, as the atmospheric pressure of the surrounding environment of the ionization box 41 increases or decreases, the air pressure of the air in the housing 41a changes. In addition, the incident-side electrode 41b and the exit-side electrode 41c are examples of the "first electrode" and "second electrode" of the patent application, respectively.

Further, as shown in FIG. 5, the bias voltage applying unit 44 is configured to apply a bias voltage between the incident side electrode 41 b and the exit side electrode 41 c. In addition, the bias voltage is a voltage applied so that the electric field (potential difference) between the incident side electrode 41b and the exit side electrode 41c is substantially constant. For example, the bias voltage applying unit 44 is configured to apply a negative voltage (for example, -300V) to the exit-side electrode 41c.

In addition, the current measurement unit 43 is configured to measure the ionization current generated when the ionization box 41 is irradiated with X-rays. Specifically, the current measuring section 43 is connected to the incident side electrode 41b. As shown in FIG. 6, the current measurement unit 43 includes an I-V conversion unit 43a, an amplifier 43b, a V-F conversion unit 43c, and a counter 43d. Next, the current (It) flowing from the incident side electrode 41b is converted into a voltage (V) through the I-V conversion unit 43a. The voltage (V) converted by the I-V conversion unit 43a is amplified (V') by the amplifier 43b. The voltage (V') amplified by the amplifier 43b is converted into a pulse having a frequency proportional to the voltage by the V-F converter 43c. The pulses converted by the V-F conversion unit 43c are counted by a counter 43d. As a result, a value corresponding to the magnitude of the current flowing from the incident side electrode 41b (the value corresponding to the total amount of current, which is referred to as the first count value below) is output from the counter 43d. In addition, the first count value is an example of the "first value" of the patent application range.

Next, as shown in FIG. 4, by entering radiation (X-rays) into the ionization box 41, the air between the entrance-side electrode 41 b and the exit-side electrode 41 c is ionized into positively charged ions and negatively charged electrons. Next, the positively charged ions move toward the negative side exit side electrode 41c side, and the negatively charged electrons move toward the positive side incidence side electrode 41b side. As a result, current is supplied between the incident-side electrode 41b and the exit-side electrode 41c, and a current is generated between the incident-side electrode 41b and the exit-side electrode 41c. This current is measured by the current measuring unit 43, whereby the amount of X-rays passing through the ionization box 41 can be obtained.

Here, in this embodiment, as shown in FIG. 3, the control unit 45 is configured to determine that the ionization box 41 and the current are included based on the charging current that flows through the ionization box and is measured by the current measurement unit while being biased. Whether the measuring device body 46 of the measuring unit 43 and the bias applying unit 44 is normal. Specifically, the control unit 45 is configured to flow through the ionization box based on the applied bias voltage and the charging current measured by the current measurement unit, and from the ionization box 41 including the incident side electrode 41b and the exit side electrode 41c Static capacitance The amount of the charged electric charge obtained by the measurement determines whether the measuring device body 46 is normal.

Here, as shown in FIG. 5, since no bias is applied between the incident-side electrode 41b and the exit-side electrode 41c, if a bias is applied between the incident-side electrode 41b and the exit-side electrode 41c, negative charges will accumulate At the exit-side electrode 41c, positive charges are accumulated in the entrance-side electrode. Thereafter, by stopping the bias voltage, a current flows between the incident side electrode 41b and the exit side electrode 41c. As shown in FIG. 7, this current increases abruptly immediately after the application of the bias voltage, and then gradually decreases, eventually becoming no flow. Next, the charging current means that the current starts to flow after the bias voltage is applied, and then becomes the total amount of current that does not flow. Specifically, the charging current corresponds to the area indicated by diagonal lines in FIG. 7. In addition, the time for applying the bias voltage is a sufficient time to charge the capacitance formed by the incident-side electrode 41b and the exit-side electrode 41c.

In addition, since the incident-side electrode 41b and the exit-side electrode 41c of the ionization box 41 are arranged to face each other with a predetermined distance, the incident-side electrode 41b and the exit-side electrode 41c constitute a capacitor. Therefore, the static capacitance is represented by C, and the charge (Q) (that is, the amount of charged charge) accumulated in the incident-side electrode 41b and the exit-side electrode 41c can be calculated by the relational expression of Q=CV. Furthermore, V is the bias voltage. Next, assuming that the charge amount (Q) has accumulated in the incident-side electrode 41b and the exit-side electrode 41c, the counted value (hereinafter, referred to as a second count value) can be calculated by the counter 43d. In addition, the amount of charge charge (Q) is calculated by the user in advance, and stored in a memory section (not shown). In addition, the second count value is an example of the "second value" of the patent application range.

Next, in the embodiment, the control unit 45 is configured to measure based on the use of current The difference between the first count value of the charging current measured by the unit 43 and the second count value calculated from the amount of charge of the ionization box 41 exceeds a predetermined threshold value, and it is determined that the measuring device body 46 is abnormal. For example, the predetermined threshold value is a value of ±2% of the second count value. In addition, when the measuring device main body 46 is abnormal, for example, the difference between the first count value and the second count value varies, and it is presumed that the operation of the measuring device main body 46 is unstable. In addition, if the measuring device body 46 is abnormal, it can be presumed that any of the IV converter 43a, the amplifier 43b, the VF converter 43c, and the counter 43d constituting the current measuring unit 43 is in a bad state, and the ionization Either the incident side electrode 41b and the exit side electrode 41c of the box 41 may have a poor state, and the bias applying unit 44 may have a bad state (a bias cannot be applied, etc.).

In addition, in the embodiment, the control unit 45 is configured to temporarily stop the application of the bias voltage through the bias voltage application unit 44 and then apply the bias voltage between the incident side electrode 41 b and the exit side electrode 41 c again by the bias voltage application unit 44 to determine the measurement. Is the device body 46 normal? That is, the bias application by the bias application unit 44 is temporarily stopped, and after the charges accumulated in the incident side electrode 41 b and the emission side electrode 41 c are discharged, the bias application by the voltage application unit 44 is restarted. In addition, the length of time during which the bias is stopped is more than a sufficient time to discharge the charges accumulated in the incident-side electrode 41b and the exit-side electrode 41c.

In addition, in the present embodiment, as shown in FIG. 3, the X-ray measuring instrument 4 is provided with an input section 47 that accepts an input to start an operation (stability check) to determine whether the measuring instrument body section 46 is normal. The input unit 47 is opened by a key, for example Off or LCD touch panel. Next, when the control unit 45 receives a command from the input unit 47 to start judging whether the meter body 46 is operating normally, the bias applying unit 44 applies a bias voltage between the incident side electrode 41b and the exit side electrode 41c. Next, the control unit 45 is configured to determine whether the gauge body 46 is normal. In addition, the stability check is performed, for example, after the X-ray imaging apparatus 1 is started and before the actual imaging starts (once a day).

Next, the operation of the X-ray measuring device 4 (control unit 45) will be described with reference to Fig. 8.

First, in step S1, it is determined whether input by the user from the input unit 47 (input for starting stability check) is to be performed. When it is determined in step S1 that input is performed from the input unit 47, the process proceeds to step S2. The operation of step S1 is continued until input is performed from the input unit 47. In addition, in step S1, bias application by the bias application unit 44 is performed.

Next, in step S2, the bias voltage application through the bias voltage applying portion 44 is temporarily stopped. As a result, the electric charge accumulated in the incident side electrode 41b and the exit side electrode 41c is discharged. Furthermore, the discharge of electric charges is not carried out by a mechanism for discharging, but naturally occurs.

After that, in step S3, the bias application unit 44 is used again to apply a bias between the incident side electrode 41b and the exit side electrode 41c. The bias is applied for a certain period.

Next, in step S4, the current measuring unit 43 measures the current flowing through the ionization box 41 by applying a bias voltage.

Next, in step S5, based on the charge measured by the current measuring section 43 The electric current and the amount of charged electric charge obtained from the static capacitance of the ionization box 41 including the incident-side electrode 41b and the exit-side electrode 41c determine whether the meter body 46 is normal.

(Effect of embodiment)

In this embodiment, the following effects can be obtained.

In this embodiment, as described above, the control unit 45 is provided, which determines that the ionization box 41 and the current measurement are included based on the current flowing through the application of a bias voltage to the ionization box 41 and the charging current measured by the current measurement unit 43. Whether the gauge body 46 of the part 43 and the bias applying part 44 is normal. Thus, it can be determined whether the measuring device body 46 is normal based on the charging current flowing through the application of the bias voltage to the ionization box 41 through the bias voltage applying portion 4 provided in the X-ray measuring instrument 4 in advance. As a result, the stability check can be performed without additionally setting a current source. Thereby, on the one hand, it is possible to suppress the increase in size and complexity, and on the other hand, the stability check can be performed. In addition, because the charging current measured by the current measuring section 43 is used to determine whether the meter body 46 is normal based on applying a bias voltage to the ionization box 41, in addition to the current measurement section 43, it can also be determined that the ionization box 41 and Whether the bias voltage applying portion 44 is normal.

In addition, as described above, in the present embodiment, the control unit 45 is configured based on the charging current flowing through the ionization box 41 by applying a bias voltage and measured by the current measuring unit 43, and from including the incident side The amount of charging electric charge determined by the static capacitance of the ionization box 41 of the electrode 41b and the exit-side electrode 41c determines whether the measuring device body 46 is normal. Thus, because the amount of charge of the ionization box 41 can be easily calculated from the static capacitance of the ionization box 41 including the incident side electrode 41b and the exit side electrode 41c Therefore, based on the charging current measured by the current measuring unit 43 and the calculated static capacitance of the ionization box 41, it can be easily determined whether the measuring device body 46 is normal.

In addition, as described above, in the present embodiment, the control unit 45 is configured as the second counter calculated from the first count value of the charging current measured by the current measuring unit 43 and the amount of charging electric charge from the ionization box 41 When the difference between the numerical values exceeds a predetermined critical value, it is determined that the measuring device body 46 is abnormal. Thus, based on the predetermined threshold value, it can be easily determined whether or not the gauge body 46 is normal.

In this embodiment, as described above, the control unit 45 is configured to temporarily stop the application of the bias voltage through the bias application unit 44 and then use the bias application unit 44 again on the incident side electrode 41 b and the exit side electrode A bias voltage is applied between 41c to determine whether the gauge body 46 is normal. With this, by temporarily stopping the application of the bias voltage, the electric charge accumulated in the incident-side electrode 41b and the exit-side electrode 41c is discharged. As a result, since the bias voltage is applied in the state where no charges are accumulated on the incident-side electrode 41b and the exit-side electrode 41c, the charging current generated only by the application of the bias voltage can be accurately measured. Thereby, errors caused by charges accumulated on the incident-side electrode 41b and the exit-side electrode 41c due to factors other than bias application (ionization due to radiation, etc.) can be suppressed to determine whether the meter body 46 is normal (false judgment).

In addition, in the present embodiment, as described above, the control unit 45 is configured in such a manner that when a start command for determining whether the measuring device body 46 is operating normally is received from the input unit 47, the bias applying unit 44 is used on the incident side A bias voltage is applied between the electrode 41b and the exit-side electrode 41c to determine whether the gauge body 46 is normal. By this, by the user operating the input section 47, the judgment can be started at the time point desired by the user It is determined whether the gauge body 46 is operating normally.

(Variation)

In addition, in the embodiment disclosed this time, all the points illustrated are not intended to limit the present invention. The scope of protection of the present invention is beyond the description of the above-mentioned embodiments. The scope defined by the scope of patent application shall prevail, and all changes (variations) within the same meaning and scope as the scope of patent application shall be included.

For example, in the above-described embodiment, although the X-ray measuring device 4 of the X-ray imaging apparatus 1 that irradiates the subject 6 with X-rays is exemplified, the present invention is not limited to this. For example, the present invention may be applied to a radiation measuring device of a radiographic apparatus that radiates radiation (gamma rays, etc.) other than X-rays to a subject 6.

In addition, in the above-described embodiment, although the input unit 47 is provided in the X-ray measuring device to receive an input to start the operation of determining whether the measuring device body 46 is normal, the present invention is not limited to this. For example, the input unit 47 may be provided in an external device connected to X-ray measurement.

In addition, in the above-mentioned embodiment, although the bias voltage applying portion 44 is applied to apply a bias voltage of -300 V, the present invention is not limited to this. For example, the bias voltage applying unit 44 may apply a negative bias voltage other than -300 V, or may apply a positive bias voltage.

In addition, in the above-described embodiment, it is exemplified that whether the measuring device body 46 is determined based on the difference between the first count value counted by the counter 43d of the current measuring unit 43 and the second count value calculated by the static capacitance Normal, but the invention is not limited to this. For example, it may be based on the charging power measured by the current measuring unit 43 The comparison between the current (total amount) and the current amount obtained from the static capacitance (charged charge amount) determines whether the gauge body 46 is normal.

In addition, in the above-mentioned embodiment, although it is exemplified that the incident-side electrode 41b and the exit-side electrode 41c are formed of transparent electrodes, the present invention is not limited thereto. For example, the incident-side electrode 41b and the exit-side electrode 41c may be composed of opaque electrodes.

In addition, in the above embodiment, for convenience of description, a process-driven flow chart according to the process flow is used to describe the processing of the X-ray imaging apparatus of the present invention, but the present invention is not limited to this. The present invention can also use an event driven type of processing that performs processing in units of events to perform processing operations. In this case, it can also be implemented with a complete event-driven type, or it can be combined with event-driven and process-driven.

Although the present invention has been disclosed as above with examples, it is not intended to limit the present invention. Any person with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The scope of protection of the present invention shall be subject to the scope defined in the appended patent application.

4: X-ray measuring device

41: ionization box

42: Measuring substrate

43: Current measurement section

44: Bias application part

45: Control Department

46: Measuring instrument body

47: Input section

Claims (6)

A radiation measuring instrument, comprising: an ionization box including a first electrode and a second electrode which are arranged opposite to each other; a bias voltage applying part which applies a bias voltage between the first electrode and the second electrode; a current measuring part , Measuring the ionization current generated by irradiating the ionization box with radiation; and the control unit, based on the application of the bias voltage, flows through the ionization box and uses the The charging current measured by the current measuring part determines whether the measuring device body part is normal. The measuring device body part includes the ionization box, the bias voltage applying part, and the current measuring part. The radiation measuring instrument according to item 1 of the patent application range, wherein the control section is configured to flow through the ionization box by applying the bias voltage and use the charging current measured by the current measuring section , And the amount of charging charge obtained from the static capacitance of the ionization box including the first electrode and the second electrode, to determine whether the main body of the measuring device is normal. The radiation measuring instrument according to item 2 of the patent application scope, wherein the control section is configured to be based on the first value of the charging current measured by the current measuring section and the value from the ionization box When the difference between the second values calculated by the charge amount exceeds a predetermined critical value, it is determined that the measuring device body is abnormal. The radiation measuring instrument according to any one of claims 1 to 3, wherein the control unit is configured to temporarily stop the application of the bias voltage by the bias voltage application unit and then Using the bias voltage applying portion to the first electrode Between the second electrode and the second electrode, the bias voltage is applied to determine whether the main body of the gauge is normal. The radiation measuring instrument according to item 1 of the scope of the patent application further includes: an input section that receives an input, the input is used to start judging whether the main body portion of the measuring apparatus is operating normally, and the control section is configured to When the input unit receives a start command for judging whether the measuring device body part is operating normally, the bias applying unit is used to apply the bias voltage between the first electrode and the second electrode to determine Is the body part of the gauge normal? A radiographic apparatus includes: a radiation irradiation section that irradiates a subject with radiation; a radiation detection section that detects radiation penetrating the subject; and a radiation measuring device provided in the radiation irradiation section and the radiation detection Between the two parts, measuring the amount of radiation irradiated by the radiation irradiating part, the radiation measuring instrument includes: an ionization box including a first electrode and a second electrode disposed opposite to each other; A bias voltage is applied between the first electrode and the second electrode; a current measurement unit that measures the ionization current generated by irradiating the ionization box with radiation; and a control unit that flows through the bias voltage based on the application of the bias voltage Ionization box and using the charging current measured by the current measuring section when the bias voltage changes in stages To determine whether the measuring device body is normal. The measuring device body includes the ionization box, the bias voltage applying part, and the current measuring part.

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