JP2007017446A - Radiation nondestructive inspection method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To acquire an image having a proper density corresponding to an analyte, even when contrast of a radiation image is heightened. <P>SOLUTION: Imaging is performed by a color CCD camera, while moving a head 17 in the direction along the tube of a tubular analyte 16 or in the rotating direction around the tube, by using a nondestructive inspection device having the head 17 wherein a radiation source for irradiating the tubular analyte 16 with a radiation, a color light-emitting sheet for emitting light in a plurality of colors by the radiation, and the color CCD camera for receiving emitted light in the plurality of colors are integrated in a body; and also by using an operation processing device 21 for heightening photographing sensitivity relatively by matching together each sensitivity characteristic of the color light-emitting sheet and the color CCD camera, separating image information including a plurality of color signals emitted from the color CCD camera into RGB signals, and detecting the signals respectively as independent image information in each color. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention particularly relates to a radiation nondestructive inspection method for nondestructively inspecting a tubular object using color light emission.

When radiation passes through a substance, absorption and scattering differ depending on the type and shape of the constituent substance. If this is recorded as an image as a photograph, video, digital file, etc., it is possible to grasp the damage state, change, filling state, etc. of the substance. This is generally the same principle as examining the internal state of the human body with radiographs. This method of measuring the internal state without destroying the object or sample to be measured is called radiography or non-destructive radiography.

In X-ray imaging used for medical diagnosis, industrial non-destructive inspection, and the like, an X-ray film is usually used in combination with a radiation intensifying screen in order to improve the sensitivity of the imaging system. In X-ray imaging, a transmitted image of a subject is obtained by, for example, blackening silver particles on an X-ray film with X-rays transmitted through the subject or light converted to visible light by an intensifying screen. ing.

As a radiation intensifying screen used for X-ray photography or the like, a phosphor layer having an emission peak corresponding to an X-ray film and a protective film for protecting the same were formed on a support made of paper or plastic in order. Things are common. In recent years, a photodetection element such as a CCD camera is used as an imaging system, and a difference in the amount of transmitted radiation is digitally detected without using an X-ray film.

In conventional radiography, there is X-ray imaging using a high-contrast film with a particularly large characteristic curve gradient in order to improve diagnostic ability. Like mammography,
For calcification and abnormal soft tissue with a small X-ray absorption difference, it is necessary to photograph with high resolution and high contrast. However, there is a problem that a photographic image with an appropriate density cannot be obtained due to a slight deviation in photographing conditions. That is, it is a problem in that the dynamic range of measurement is narrow. Also, if the measurement target is different in elemental composition, such as bone and muscle, the X-ray irradiation time must be determined from many experiences in consideration of the X-ray energy to be used and the thickness of the part. Don't be. The same is true even when the elemental composition is almost the same and the density is different, such as normal tissue and abnormal tissue such as cancer.

On the other hand, in the conventional color radiography, a color X-ray photograph in which the color is changed corresponding to the difference in X-ray dose is obtained (see Patent Documents 1 and 2). However, even if it is attempted to extract information only from the color change on such a color X-ray photograph, for example, a green component or a blue component is added to the red component at a portion where the dose is large, and the color photograph is close to white. On the other hand, there is a problem that it is difficult to extract information, and even if a large amount of information is included, it cannot be used effectively. In some cases, it is difficult to extract information from a normal black-and-white photograph.

For such a point, a color light emitting sheet that emits a plurality of colors when irradiated with radiation such as X-rays that have passed through the subject, and a color film that detects light emission of a plurality of colors emitted from the color light emitting sheet for each color For example, Patent Document 3 discloses a color X-ray system that includes light detection means such as a color camera and obtains image information of a plurality of colors having different sensitivity characteristics. Here, the color light-emitting sheet has, for example, a main light-emitting component corresponding to one light-emitting color in the visible light region, and a light-emitting ratio with respect to radiation having the same light intensity and different intensity from the main light-emitting component. And a phosphor in which the light emission ratio of the main light emission component and the sub light emission component is adjusted in accordance with the dynamic range of the imaging system.

FIG. 8 is a graph showing an example of characteristics regarding the density and the amount of received light obtained when X-rays are applied. According to the above-described color X-ray system, as shown by characteristic curves R (indicating red), G (indicating green), B (indicating blue) and the like in FIG. An image can be obtained by detecting, for each color, light of a plurality of colors emitted corresponding to a difference in X-ray dose using characteristics indicating the relationship. In the obtained image, the low-dose portion is obtained as red information without green and blue information, the red information is saturated and obtained as green information when the dose increases, and red when the dose increases further. The green information is saturated and obtained as blue information. That is, it is possible to obtain a photographic image having an appropriate density under relatively wide conditions and obtain a lot of information from the obtained photographic image.

However, although this color X-ray system describes a basic method for expanding the dynamic range of an imaging system, the conditions may not be appropriate depending on the imaging target region or individual differences of the subject's human body or animal. In some cases, an appropriate photographic image cannot be obtained. For example, in the case where the object to be measured is iron and plastic, the optimization of the photographing conditions is naturally different based on the difference in specific gravity, and the thickness of the photographing object portion must also be taken into consideration. Furthermore, when there are a plurality of different substances such as a composite material, an appropriate photographic image may not be obtained.

On the other hand, when a film, an imaging plate, or the like is used in the above-described measurement method, a result obtained directly on the spot cannot be obtained, and image information cannot be obtained unless development or laser reading is performed. On the other hand, as a method for directly capturing an image as digital information, a moving image system combined with a monochrome CCD camera using an electron tube image intensifier and a semiconductor type flat detector using a liquid crystal display as a light receiving device have been developed. In systems using these detectors, still images and moving images can be viewed directly on the monitor, but since the X-ray detector is monochrome, images with a wide dynamic range can be viewed simultaneously. Can not. Moreover, even if the dynamic range is widened in monochrome due to the problem of human visibility, the range in which the gray difference can be recognized is limited. Generally, the density difference is 1 to 2 digits. Furthermore, at present, these detectors are not large in terms of manufacturing. It is about 30 centimeters square, and the price is quite high.
Japanese Patent Publication No. 48-6157 Japanese Patent Publication No. 48-12676 JP 2001-209142 A

As described above, in conventional radiography, there is a problem that when a high-contrast film is used, a photographic image with an appropriate density cannot be obtained due to a slight deviation in imaging conditions. In addition, since the amount of transmitted radiation is related to the specific gravity and density of the measurement object, when photographing a part where a substance with a different specific gravity exists or a part where a substance with a different density exists. It is difficult to set shooting conditions, and it is impossible to obtain a photo with an appropriate density.

On the other hand, the conventional color radiography merely changes the color corresponding to the difference in X-ray dose. There is a problem that it is difficult to extract information only from the color change on such a color X-ray photograph, and that even if a large amount of information is included, they cannot be used effectively. In some cases, it is difficult to extract information from a normal black-and-white photograph.

In addition, in the color X-ray system, the dynamic range of the imaging system has been widened, and measurement with fewer failures has become possible. However, if the subject is clear, the color emission ratio can be changed according to the subject. It is required to adjust another characteristic curve.

For this reason, for example, it is possible to set appropriate imaging conditions according to subjects with different amounts of X-ray transmission, and prevent the occurrence of insufficient exposure and excessive exposure due to slight differences in imaging conditions, Furthermore, there is a need for a radiation imaging system that can effectively use a lot of obtained information. Relaxing the condition setting at the time of radiation imaging not only prevents the occurrence of imaging errors and reduces excessive radiation, but also greatly contributes to improvement of inspection accuracy.

The present invention has been made in order to cope with such problems. The purpose of the present invention is to provide a photographic image having an appropriate density and an accurate photographic image according to the subject even when, for example, the contrast of the radiograph is increased. The object is to provide a radiation nondestructive inspection method which can be obtained.

Another object of the present invention is to obtain a photographic image having an appropriate density and an accurate photographic image according to the subject, and to obtain a large amount of information reliably and effectively by a single photographing according to the subject. The object is to provide a radiation non-destructive inspection method.

In order to achieve the above object, the present invention provides a radiation source for irradiating a tubular subject with radiation, and the radiation irradiated from the radiation source is disposed in a position where the subject penetrates the subject. A color light-emitting sheet having phosphors that emit light and have different ratios of light emission of the plurality of colors with respect to radiation of the same intensity, a color CCD camera that is provided behind the color light-emitting sheet and receives the light emission of the plurality of colors, and the radiation Source, radiation, a color light emitting sheet, a head incorporating a color CCD camera, the color light emitting sheet and the color CC
An operation for matching the sensitivity characteristics with the D camera to relatively improve the photographing sensitivity and separating the image information including a plurality of color signals received by the color CCD camera into RGB signals and detecting each as individual image information of each color. A radiation nondestructive inspection method using a radiation nondestructive inspection apparatus comprising a processing device and a moving means for moving the head relative to the tubular subject, wherein the head is moved by the moving means. Imaging is performed with the color CCD camera while moving in a direction along the tube of the tubular subject or in a rotation direction around the tube.

According to the radiation nondestructive inspection method of the present invention, even when the contrast of a radiographic image is increased, an image having an appropriate density according to the subject can be obtained, and a large amount of information can be obtained by one imaging according to the subject. Can be obtained reliably and effectively.

Hereinafter, embodiments of a radiation nondestructive inspection method according to the present invention will be described with reference to the drawings.

FIG. 1 is a schematic configuration diagram schematically showing a basic configuration example of a radiation imaging apparatus to which the radiation nondestructive inspection apparatus of the present invention is applied. As shown in FIG. 1, the radiation imaging apparatus targets a subject 1 such as a human body or various articles, and a radiation source such as an X-ray tube 2 is opposed to the subject 1. The X-ray tube 2 emits radiation such as X-rays 3. Note that the radiation used for imaging is not limited to X-rays (or γ-rays), and β-rays, thermal neutron rays, and the like can also be used.

A color light emitting sheet 4 as a color light emitting means is disposed on the opposite side of the subject 1 from the X-ray tube 2, and the X-ray 3 absorbed or scattered by the subject 1 is this color light emitting sheet 4. Is irradiated. The color light-emitting sheet has phosphors that emit light in a plurality of colors with respect to radiation such as X-rays 3. The light of a plurality of colors emitted from the color light emitting sheet 4 has a luminance distribution according to the distribution of the X-rays 3 absorbed or scattered by the subject 1. Further, the color light emitting sheet 4 is configured such that the color light emission ratio can be changed according to the subject.

A color CCD camera 5 is arranged behind the color light emitting sheet 4 as means for collectively receiving light of a plurality of colors from the color light emitting sheet 4. In the color CCD camera 5,
Light emission of a plurality of colors (image information of a plurality of colors) having a light emission distribution based on distribution information of X-rays 3 absorbed or scattered by the subject 1 is received in a lump.

Image information including a plurality of color signals received and detected by the color CCD camera 5 is separated into RGB signals by the arithmetic processing unit 6 and detected as individual image information of each color. The image information of each color is recorded as a digital signal in a recording unit, for example, a memory of the arithmetic processing unit 6. At this time, the dynamic range can be adjusted by changing the ratio of the RGB signals indicating red, green, and blue after separating the white component. In the figure, reference numeral 7 denotes a display device which can directly display image information of each color.

Further, the signals separated for each color can be calculated by each signal and the result can be recorded. For example, when the difference in density can be confirmed with a red component in a certain substance and the difference in density is visible with a green component in another substance, it can be displayed in a pseudo color so that each can be seen. Also, only that portion can be cut out and displayed separately. Furthermore, the noise in the red component can be corrected with the green component and the blue component, and the portion that is white due to the loss of some data can be corrected.

A monitor camera 9 for observing the appearance at the same time as the above-described transmission image is provided, and at the same time, remote diagnosis by the communication device 8 is possible.

FIG. 2 is a cross-sectional view showing an example of the configuration of a color light emitting sheet used in the radiation imaging apparatus shown in FIG. As shown in FIG. 2, the color light emitting sheet 4 includes a sheet base material 10 made of, for example, a plastic film or a nonwoven fabric, and the phosphor layer 11 is provided on the sheet base material 10. A transparent protective film 12, for example, a protective film 12 made of a polyethylene terephthalate film having a thickness of about several μm is disposed on the phosphor layer 11 as necessary.

The phosphor layer 11 described above includes a phosphor that emits light in a plurality of colors, that is, a phosphor having a plurality of emission wavelength regions. For the phosphor layer 11, for example, considering a color CCD camera, it is preferable to use a phosphor that emits light in a wide wavelength range within a visible light region (for example, a region having a wavelength of 400 to 700 nm). Specifically, it is preferable to use a phosphor having an emission spectrum corresponding to at least two emission colors in the visible light region. That is, it is preferable to use a phosphor having an emission spectrum including a main light emitting component and a sub light emitting component having different emission colors.

As the emission color of the phosphor, typically, at least two emission colors among blue emission, green emission, and red emission are given. However, it is not limited to these emission colors, and various emission colors can be applied as long as the emission colors can be distinguished from each other. For example, purple emission or yellow emission close to ultraviolet rays may be used.

3A and 3B show sensitivity characteristics (sensitivity matching) between the color light-emitting sheet 4 and the color CCD camera 5 used in the radiation imaging apparatus shown in FIG. 1, and the concentration and emission of phosphor activator. It is a graph which shows a wavelength.

FIG. 3A shows the sensitivity characteristics of two types of CCD cameras 5 (A, B) and the color light emitting sheet 4.
Phosphors Gd2O2S: Eu (solid line) and Gd2O2S: Tb (two-dot chain line)
The light emission characteristics are shown. The sensitivity of the camera A indicated by the broken line is higher than the sensitivity of the camera B indicated by the alternate long and short dash line in FIG. In this case, compared to the phosphor Gd2O2S: Tb, Gd
2O2S: Eu matches the sensitivity characteristic of the camera, and the sensitivity of imaging is relatively high.

FIG. 3B shows a case where the concentration of the phosphor activator Eu of the phosphor Gd2O2S: Eu is changed (4% and 0.1%). As shown in FIG. 3B, the phosphor Gd2O2
By changing the concentration of the S: Eu activator Eu, the ratio of the red light emitting region (R), the green light emitting region (G), and the blue light emitting region (B) can be changed. That is, by using a characteristic curve indicating the relationship between exposure amount and density of the imaging system as shown in FIG. 8, a plurality of colors of light emitted corresponding to the difference in X-ray dose are detected for each color. An image is obtained. In the obtained image, the low-dose part is obtained as red information without green and blue information, the red information is saturated and obtained as green information when the dose increases, and red when the dose further increases. The green information is saturated and obtained as blue information. That is, it is possible to obtain a photographic image having an appropriate density under relatively wide conditions and obtain a lot of information from the obtained photographic image.

FIG. 4 shows a specific configuration example in which the radiation nondestructive inspection apparatus of the present invention is applied to a drum can. In the configuration example shown in FIG. 4, a drum can 13 is used as the subject 1. And
An X-ray tube 2 as an X-ray generation device, which is a radiation source, and a monitor camera 9 for observing the appearance of the drum can 13 are installed on the same column. Further, as moving means for moving the drum can 13 to a position facing the X-ray tube 2 and the monitor camera 9, a horizontally arranged conveyor 14 and a turntable 15 for moving the drum can 13 up and down are provided. The conveyor 14 has a function of moving the drum can by a plurality of rollers 14a and the roller 14a as a belt 14b.
A plurality of drums 13 can be mounted on the roller 14a in a vertical state, and can be advanced to the positions of the X-ray tube 2 and the monitor camera 9 while rotating the roller 14a. The turntable 15 is disposed at a position facing the X-ray tube 2 and the monitor camera 9, and the drum can 13 can be rotated, for example, around a vertical axis. Drum can 1
A color light emitting sheet 4 and a color CCD camera 5 are arranged at positions facing the X-ray tube 2 and the monitor camera 9 with 3 interposed therebetween. Although not shown in FIG. 4, the color CCD camera 5 is connected to the arithmetic processing unit 6, the display unit 7 and the communication unit 8 as in FIG. Alternatively, information transmission is performed wirelessly. Moreover, although not shown in figure, the elevator which moves the drum can 13 up and down is provided.

However, the appearance of the drum 13 is less determined than from only appearance if viewed from either direction because it is cylindrical. Therefore, the angle discriminating marker 13a on the outer peripheral surface of the drum can 13
The drum number, company name, logo, etc. are written on the outer surface of the sign 13a and the drum can 13, and the monitor camera 9 makes it easy to determine the direction of the drum can 13.

In imaging, X-rays irradiated from the X-ray tube 2 pass through the drum can 13 and are input to the color light emitting sheet 4 and the color CCD camera 5. Image information in the drum 13 including a plurality of color signals detected by the color light emitting sheet 4 and the color CCD camera 5 is separated into RGB signals by the arithmetic processing unit 6 and detected as individual image information of each color. The image information of each color is displayed as a digital signal on the display device 7 and recorded in a recording unit such as the communication device 8. Furthermore, this data is transmitted to a place where it can be remotely operated.

In the apparatus shown in FIG. 4, while rotating an article such as a drum can 13, an external appearance and an internal nondestructive image can be obtained simultaneously, and an image having a wide dynamic range can be obtained simultaneously by a color light emitting sheet and a color CCD camera.

FIGS. 5A to 5E are explanatory diagrams illustrating results obtained using the apparatus shown in FIG. Each of FIGS. 5A to 5E is drawn based on a photograph obtained by actually capturing a small drum 13, and FIG. 5A shows a color acquired image. (B) has shown the external appearance image. 5C, 5D, and 5E respectively show a red component image, a green component image, and a blue component image.

Inside the drum can 13, an iron pipe 27 a, a spanner 27 b, a driver 27 c, and the like were inserted as inserts 27 and photographed while rotating. Things that are difficult to transmit X-rays such as iron are shown in FIG.
As shown in (C), the structure is clearly seen in the red component image. For example, the shaded portion such as the state of the pipe 27a and the state of the spanner 27b is seen through. On the other hand, an object made of resin such as a handle of a driver has a green component (FIG. 5D) and a blue component (FIG. 5E
)). In these components, unlike the red component, iron is only reflected as a black shade.

Furthermore, it is easy to confirm the shadowed object by rotating the image, and images having different color components can be observed at the same time. Therefore, it is easy to confirm the contents instantly on the spot. In addition, an external monitor image (FIG. 5B) can be observed at the same time, and the direction and the filling state of the contents are easily understood.

FIG. 6 illustrates the main configuration of an embodiment in which the radiation nondestructive inspection apparatus of the present invention is applied to piping. In the configuration example shown in FIG. 6, a radiation nondestructive inspection apparatus when a pipe 16 is used as the subject 1 is shown. An X-ray tube 2 and a monitor camera 9 as well as a color light emitting sheet 4 and a color CCD camera 5 are integrated in a head 17 as an X-ray generator.

The unit 18 has a function of displaying and recording the power to be sent to the head 17, the appearance obtained from the head 17 and transmission image information including a plurality of color signals, and further transmitting it remotely. The head 17 has a function of rotating around the pipe 16 and self-running in the horizontal direction along the pipe 16, for example. The work area is restricted by the pole 19. And
As shown with a frame in FIG. 6, diagnosis by image information and operation of the head 17 and the unit 18 can be performed by a computer 21 by transferring information at a place 20 where remote operation is possible.

FIG. 7 is an explanatory diagram showing a configuration example in which the radiation nondestructive inspection apparatus of the present invention is applied to an object that is difficult to move. As shown in FIG. 7, an object that is difficult to move as the subject 1 is mounted on the table 23, and this table 23 is arranged on the operating table 24.

An X-ray tube 2 as an X-ray generator and a collimator 22 that determines the direction of the X-ray 3 are the subject 1.
It is arranged above.

A color light emitting sheet 4 is provided below the base 23 so as to be positioned almost directly below the subject 1, and a reflecting mirror 25 is obliquely provided below the color light emitting sheet 4. And at the position facing this mirror 25,
A color CCD camera 5 having a zoom lens 26 is disposed.

At the time of imaging, X-rays 3 irradiated downward from the X-ray tube 2 pass through the subject 1.
A transmission image including a plurality of color signals emitted from the color light emitting sheet 4 is reflected by the mirror 25 and bent in the horizontal direction, and is captured by the color CCD camera 5 through the zoom lens 26. These are integrated into one image pickup unit and can be moved under the base 23. The imaging unit can be viewed in conjunction with the collimator 22 by moving a specific part in the XY directions. Furthermore, it is also possible to enlarge and view locally with the zoom lens 26.

According to the above embodiment, the radiation source such as the X-ray tube 2 that irradiates the subject 1 with radiation, and the radiation irradiated from the radiation source are disposed at the destination through the subject 1, and a plurality of radiation sources are emitted by the radiation. A color light-emitting sheet 4 having a phosphor that emits light in a color and has different ratios of light emission of a plurality of colors with respect to radiation having the same intensity, and a plurality of colors emitted from the phosphor based on radiation irradiation are separated by color By adopting a configuration including detection means such as a color CCD camera 5 for detection, an image having a wide dynamic range can be obtained simultaneously.

Further, since it includes moving means such as a conveyor 14 and a turntable 15 for moving at least one of the radiation source, radiation, the subject 1 and the color light emitting sheet 4 relative to the other, for example, the subject 1 On the other hand, by moving the radiation source and the color light-emitting sheet 4 relatively to pick up an image, it is possible to easily check a thin object that cannot be confirmed from one direction or an object that is difficult to see hidden behind heavy metal.

Further, a monitor camera 9 for observing the appearance of the subject 1 and an image of the monitor camera 9 and a detection image separated by colors composed of a plurality of colors of light emitted from a phosphor based on radiation irradiation are simultaneously displayed. Display means such as the display device 7 or a recording means for recording these images, a plurality of images emitted from the phosphor based on the image of the camera for observing the appearance of the subject 1 and the radiation irradiation. Images detected by separating the color emission by color can be displayed or recorded at the same time, and what is contained in what direction in the direction seen from the appearance and what state it is in easy.

Further, communication for transferring a detection image separated by colors composed of a plurality of colors of light emitted from a phosphor based on an image of the monitor camera 9 and irradiation of radiation to a position separated from the subject 1 by wire or wirelessly. Since the image transfer means such as the apparatus 8 is provided, the acquired image can be transferred by wire or wireless to perform remote diagnosis.

Further, a zoom lens 26 or the like that optically or electronically enlarges a detection image separated by colors composed of a plurality of colors of light emitted from a phosphor based on an image of the monitor camera 9 and irradiation of radiation. Since a mechanism is provided and an image can be enlarged and observed, resolution at a local location can be increased.

Further, when imaging is performed by moving the subject 1 relative to the radiation, the subject 1 is continuously moved by the conveying means such as the conveyor 14 while rotating the subject 1 up and down or left and right. Thus, stereoscopic perspective can be performed without stopping the flow of the line of the subject 1.

In addition, a tomographic image is observed by a computed tomography image by obtaining a stereoscopic image by reconstructing an image by the computer 21 from a color image captured by moving the subject 1 relative to the radiation. It can be performed.

Further, when the appearance image of the subject 1 and the image detected by separating the plurality of colors of light emitted from the phosphor based on the irradiation of radiation are displayed or recorded simultaneously, the subject 1 or By simultaneously displaying or recording the position or amount of movement of the indicator 13a indicating this, the appearance image of the subject 1 and the light emission of the plurality of colors emitted from the phosphors based on the radiation irradiation can be separated by color. When the detected image is simultaneously displayed and recorded, the position and direction of the subject 1 can be easily understood.

Further, by attaching a label 13a to the subject 1 and reading the label 13a from the appearance image of the subject 1, and simultaneously displaying or recording the feature, the examination position or the movement amount of the subject 1, a sphere, The appearance position becomes clear for a subject such as a cylinder or a cone whose appearance is difficult to distinguish from any direction, and the imaging direction and the internal position can be clearly known.

While the subject 1 is fixed, at least one of the radiation source, the camera, and the detection means is moved relative to the subject, and the position or movement amount of the subject 1 or the label 13a indicating the same is simultaneously set. By displaying or recording, it is possible to reduce the movement burden when it is difficult to move the subject 1.

Explanatory drawing which shows typically the principal part structure of embodiment of the radiography apparatus to which the radiation nondestructive inspection apparatus of this invention is applied. Sectional drawing which shows an example of a structure of the color light emission sheet used with the radiography apparatus shown in FIG. (A) (B) is a figure which shows the sensitivity characteristic of the color light emission sheet and color CCD camera which were used with the radiography apparatus shown in FIG. The figure which shows the principal part structure of embodiment which applied the radiation nondestructive inspection apparatus of this invention to the drum can. (A), (B) (C) (D) (E) is a figure which shows an example of the result obtained using the radiation nondestructive inspection apparatus shown in FIG. The figure which shows the principal part structure of embodiment which applied the radiation nondestructive inspection apparatus of this invention to piping. The figure which shows the principal part structure of embodiment which applied the radiation nondestructive inspection apparatus of this invention to the object which is hard to move. The figure which shows an example of the characteristic curve of the density | concentration and light reception amount which are obtained when the radiation nondestructive inspection apparatus of this invention is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Subject, 2 ... X-ray tube, 3 ... X-ray, 4 ... Color light emission sheet, 5 ... Color CCD camera, 6 ... Arithmetic processing device, 7 ... Display apparatus, 8 ... Communication apparatus, 9 ... Monitor camera, 10 ... Sheet base material, 11 ... Phosphor layer, 12 ... Protective film, 13 ... Drum can, 14 ... Conveyor, 15 ... Turntable, 16 ... Piping, 17 ... Head, 18 ... Unit, 19 ... Pole, 20 ... Remote control Location, 21 ... computer, 22 ... collimator, 23 ... stand, 24 ... working stand, 25 ... mirror,
26: Zoom lens.

Claims (3)

A radiation source for irradiating a tubular subject with radiation, and the radiation emitted from the radiation source is disposed at a point where the subject passes through the subject, and the plurality of colors with respect to radiation having the same intensity are emitted by the radiation in a plurality of colors. A color light emitting sheet having phosphors with different light emission ratios, a color CCD camera provided behind the color light emitting sheet and receiving the light of the plurality of colors,
The color CCD is obtained by matching the sensitivity characteristics of the radiation source, the radiation, the color light emitting sheet, and the color CCD camera integrally with the color light emitting sheet and the color CCD camera to relatively increase the photographing sensitivity. An arithmetic processing unit that separates image information including a plurality of color signals received by the camera into RGB signals and detects them as individual image information of each color;
A radiation nondestructive inspection method using a radiation nondestructive inspection apparatus provided with a moving means for moving the head relative to the tubular object, wherein the head is moved by the moving means. A non-destructive inspection method for radiation, wherein imaging is performed with the color CCD camera while moving in a direction along the tube or in a rotating direction around the tube. 2. The radiation nondestructive inspection method according to claim 1, wherein a unit including a power source of the head and means for recording the image information obtained by the color CCD camera is connected to the head. The radiation nondestructive inspection method according to claim 2, wherein the unit has a function of transmitting the image information to the arithmetic processing unit.

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