JPS5937453A - Nondestructive inspection device - Google Patents

Abstract

PURPOSE:To brought plural radiation generators under the control of one controller, by measuring the dosage of radiation from a radiation source directly by a solid-state dosimeter, and feeding its output back to the controller and determining specific irradiation condition. CONSTITUTION:When a standard voltage is applied to the side of an X-ray generator 1 and X-rays are radiated from an X-ray tube 3, the solid-state dosimeter 5 fitted to the X-ray tube 3 measures its dosage directly. This measured value is stored in a storage circuit 14 and an arithmetic circuit 15 calculates the control condition regarding a tube voltage, tube current, etc., within an energy range required for use and sends out a corresponding correction control signal to the generator 1 to radiate a desired amount of radiation from the X-ray tube 3. Consequently, the radiation generator is standardized and plural radiation generators are brought under the control of one controller; when the duty ratio of each X-ray generator is 30-50%, the apparently continuous use of, for example, three X-ray generators is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention relates to a non-destructive testing device used for, for example, testing welded parts of steel pipes, testing electrical component structures, and testing bricks and concrete.

Conventionally, as an example of this type of device, for example, a radiation generator that houses at least the X-ray tube of an X-ray tube and a high-voltage transformer in a container, and a controller that is connected to the radiation generator via a low-voltage cable. (L1 controller). Inspection results are obtained by processing using well-known means such as direct visualization using a vidicon or image intensifier.

Nowadays, when equipment is becoming lighter, the generators are usually gas-insulated, and therefore the heat dissipation from the X-ray tube inside the container relies on air-cooling means. Due to the necessity of achieving this cooling effect, this type of device must not be used continuously, and is restricted to use at a maximum duty ratio of 50%. However, when inspecting an object with a large X-ray absorption coefficient, the irradiation is performed under high voltage for a long time, so using the above 50% duty ratio may cause anxiety when using 4fi, a duty ratio of 30 to 40%. You have to drop it to use it, which is extremely inefficient.

In order to improve such inefficient inspection, multiple generators are prepared for one controller, and each of these generators is operated sequentially to achieve an apparent 100% duty. Ideally, it would be possible to use a ratio of 0 to 1, but this has not been possible due to the lack of standardization in conventional generators.

That is, since the X-ray tube in the generator is generally a so-called containment tube, there are variations in the X-ray irradiation intensity. For this reason, during inspection, it is necessary to create an exposure diagram using one generator and one controller as a set, take test shots, and then adjust the irradiation dose. generators are not compatible. Furthermore, since it is necessary to continue cooling the X-ray tube as described above even when the apparatus is not in use, it is not possible, for example, to turn off the power and replace only the generator when the apparatus is not in use. For this reason, in the past, a plurality of devices each consisting of a generator and a controller were prepared, and these devices were operated in sequence to achieve an apparently 100% duty ratio. However, this is an extremely uneconomical form of use.

Therefore, the present invention focuses on the fact that if the above-mentioned generators are standardized and compatibility becomes possible, a plurality of generators can be controlled with one controller, and a solid-state dosimeter is built into the generator. By feeding back the output value to the controller and correcting the control signal to the desired value, multiple generators can be operated sequentially for one controller, making it easier to inspect. The purpose is to provide a non-destructive inspection device that allows work to be carried out rationally and economically.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing an example of a non-destructive testing apparatus according to the present invention. In the figure, 1 is a radiation generator,
As shown in FIG. 2, an X-ray tube 3, a filament transformer (not shown), and a high-voltage transformer 4 are housed in a container 2.

The container 2 is composed of an outer wall 2a made of, for example, iron or aluminum, and an inner wall 2b made of a button.A part of the inner wall 2b is removed to form an X-ray emission port 2C, and in order to make the inside a sealed structure, for example, The radiation port 2C is closed with a closing plate 2d made of aluminum, beryllium, or glass. When the above-mentioned closing plate 2d is made of aluminum, the outer wall 2&
is formed integrally with. Furthermore, the container 21 is filled with insulating gas or oil, or is evacuated. 5 is a solid-state dosimeter that directly measures the irradiation radiation from the X-ray tube 3 that is irradiated onto the inspected object M; for example, as shown in Fig. 5, it is built in a case 7 and receives the X-ray radiation. It is composed of a fluorescent plate 8, a photoelectric element 11 that photoelectrically converts the light emitted from the fluorescent plate 8, and outputs it from an external terminal 9.10.

12 is a control circuit that controls the tube voltage, tube current, etc. for the X-ray tube 3; 13 is a standard voltage application circuit that is connected to the control circuit 12 and supplies a standard voltage to the generator 1 side; 1;
Reference numeral 4 indicates a memory circuit for storing the output value from the solid-state dosimeter 5 at an arbitrary energy μ value of the X-ray tube 3; This arithmetic circuit calculates pipe control conditions, and together with the storage circuit 14, constitutes a correction control circuit 16 that sends out a correction control signal from the control circuit 12. This correction control circuit 16 and the control circuit 12 constitute a controller 17.

Next, the operation of the above configuration will be explained.

First, a standard voltage is applied to the X-ray generator 1 side, and the
When X-rays are irradiated from the dosimeter 5, the solid-state dosimeter 5 directly measures the dose. This measured value is stored in the memory circuit 14, and the arithmetic circuit 15 calculates control conditions such as tube voltage and tube current over the energy range necessary for use, so the corresponding correction control signal is generated. The X-rays are sent to the X-ray tube 6, and a desired amount of X-rays is emitted from the X-ray tube 6.

As described above, since standardization of the X-ray tube 3 is achieved, a plurality of X-ray generators 1 can be controlled by one controller 17. In other words, since the duty ratio of 101 X-ray generators is 30 to 50%, for example, three X-ray generators 11 to 13 are connected to a low pressure cape/
One controller 1 via I/18 (18t~183)
If the controller 17 is provided with a switching means that connects to the X-ray generator 7 and operates another X-ray generator 12 when one X-ray generator 11 is inactive, it can be used with an apparent duty ratio of 100%. can. Of course, in this case, it is necessary to set the irradiation intensity of each generator 11 to 13 to be the same.

Here, one controller 17 has a plurality of X-ray generators 11 to
13 can be connected to conduct transmission tests, test work can be carried out efficiently with a minimum number of people, and the incidence of radiation exposure accidents can be reduced compared to conventional methods. - 13 can be used while comparing the generators 11 to 13, allowing for early detection of failures in the generators 11 to 13. Furthermore, even if one generator 1 fails, other generators 1 can be used for testing, reducing loss time. can be reduced. Further, since the solid-state dosimeter 5 is built into the X-ray generators 11 to 13 as in the above configuration, there is an advantage that automatic flash photography can be easily performed.

In addition, in the above embodiment, as the radiation generator 1,
Although the case where the X-ray tube 3 is used has been described, the X-ray tube 6 may be replaced by an α-ray, β-ray, or r-ray generating source.
Further, an electron beam source that emits an electron beam instead of radiation may be used.

Further, the solid-state dosimeter 5 has advantages such as linearity in a certain energy range, no need for high-voltage electric traces or amplifiers, easy construction, and resistance to impact.
The device is not limited to the above configuration as long as it can directly measure the dose.

As described above, the present invention incorporates a solid-state dosimeter in a generator to directly measure radiation from a radiation or electron beam source,
Since the output from this solid-state dosimeter is fed back to the controller to determine the predetermined irradiation conditions, standardization and compatibility of the generators mentioned above has been achieved, which allows multiple generators to be controlled by one. It can be connected to a device and used continuously at an apparent 100% duty ratio, allowing non-destructive testing to be carried out rationally and economically.

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an example of a non-destructive testing device according to the present invention, Fig. 2 is a schematic sectional view showing an example of a generator in the same device, and Fig. 3 is a partially cutaway surface measurement diagram of a solid-state dosimeter. , FIG. 4 is a block diagram showing an example of how the device is used. 1 (11-13)... Radiation generator, 3... Radiation tube, 5... Solid dosimeter, 12... Control circuit, 15...
... Correction control circuit, 16... Controller, L... Radiation. Patent applicant: Shimizu et al. Patent attorney: Kunihide Namba (1 other person) 2nd Ward

Claims (1)

[Claims] (1) A radiation or electron beam generator, a controller that has a control circuit that sends control signals to the generator and is configured separately from the generator, and a controller built in the generator that emits radiation Alternatively, a solid-state dosimeter that directly measures the dose at the standard energy value of the electron beam source, and the output from the solid-state dosimeter that is weighed by the above-mentioned controller, are used to calculate radiation source control conditions over the energy range required for inspection. and a correction control circuit that corrects and outputs a radiation source control signal from the control circuit.