JPH0734400Y2 - X-ray target - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an X-ray target for applying accelerating electrons to generate bremsstrahlung X-rays.

(Prior Art) It is already well known to use an X-ray generation plate such as tungsten or tantalum in this type of X-ray target. In that case, the X-ray generating plate generates heat due to the irradiation of electrons, so that it is required to cool it. Usually, this is generally done by water cooling.

The first conventional example is shown in FIGS.
And the pipes 42 that connect the open ends of the end faces of the pipes in a staggered manner. Each pipe is made of an X-ray generating plate.

The electrons hit the surface of the pipe and produce X-rays. The cooling water is sent from the inlet 43 into the pipe. Then, the pipes 41 sequentially flow in a staggered manner to cool the pipes.
Then, it is discharged from the outlet 44 to the outside.

The second conventional example shown in FIGS. 6 and 7 is constructed by supporting an X-ray generating plate 62, which is arcuate, by a rectangular frame 61. Reference numeral 63 is a reinforcing member for mechanically reinforcing the arc-shaped X-ray generation plate 62 from the back surface, which is also arc-shaped. Then, cooling water is caused to flow into the space 64 between the X-ray generation plate 62 and the reinforcing member 63.

In order to eliminate the influence of scattered X-rays 65 from the X-ray generation plate 62, a shielding plate 66 for shielding scattered X-rays heading to the left and right outside of the irradiation direction of the accelerated electrons is installed.
It should be noted that the scattered X-rays are scattered in a large amount toward the left and right outside with respect to the irradiation direction of the accelerated electrons, and the scattered X-rays traveling in the direction opposite to the irradiation direction are relatively small. Therefore, it is sufficient to shield scattered X-rays just by installing them on the left and right sides like the shielding plate 66. The shielding plate 66 also has a water cooling structure.

(Problems to be Solved by the Invention) However, in the above-described first conventional example, it is necessary to arrange and connect a plurality of pipes in parallel, so that the structure becomes complicated and the cooling water flows in a staggered manner. Therefore, there is an inconvenience that high pressure is required.

Further, in the second conventional example, since the reinforcing material 63 has an arc shape, the water pressure of the cooling water is concentrated and applied to the bulging portion of this arc portion. Therefore, a thick reinforcing material 63 is required. As a result, the amount of X-ray absorption by the reinforcing material 63 increases and X
Line utilization efficiency decreases. Further, the shielding plate 66 must be provided, and the X-rays passing through the reinforcing material 63 may hit the frame 61 and be absorbed.

The present invention aims to increase the X-ray utilization efficiency with a simple structure.

(Means for Solving the Problem) The present invention is to attach a backside material to the back surface of a flat X-ray generation plate via a gap serving as a cooling water channel, and to mount the X-ray generation plate on both sides of the X-ray generation plate. A cooling water duct that bulges toward the front surface side is provided, and the inside of the duct is communicated with the gap.

(Operation) When cooling water is sent from a duct provided on one side surface of the X-ray generation plate, the cooling water passes through the gap between the X-ray generation plate and the back surface material, and the other cooling water of the X-ray generation plate. It flows into a duct provided on the side surface and flows out from here. The X-ray generation plate is cooled by the flow of the cooling water.

By irradiating the X-ray generation plate with accelerated electrons, X-rays are emitted from here. The X-rays are emitted from the backing material to the outside through the voids. The scattered X-rays from the X-ray generator are
Shielded by ducts on both sides of it. It does not diverge outside.

(Embodiment) An embodiment of the present invention will be described with reference to FIG.

Reference numeral 1 denotes an X-ray generation plate whose front surface is irradiated with accelerated electrons, and a backing material 2 is arranged on the back surface of the X-ray generation plate through a gap 3 serving as a cooling water channel. Reference numeral 4 is a reinforcing member that connects the X-ray generating plate 1 and the back surface material 2 so that the opening portions of the voids 3 are secured on both sides of the reinforcing member. There are multiple.

The void length of the void 3 is preferably 1 mm or less, for example, about 0.5 mm.

Further, the X-ray generation plate 1 and the back surface material 2 are connected to each other by spot welding at a plurality of positions other than both ends thereof at appropriate intervals. Reference numeral 5 indicates the welding point. By this welding, the X-ray generation plate 1 is reinforced with respect to the backing material 2.

Reference numerals 6 and 7 denote cylindrical ducts (for example, made of stainless steel) arranged on the left and right outer sides of the X-ray generation plate 1 with respect to the irradiation direction of accelerated electrons, and one of the ducts 6 has an inlet 8 for cooling water. The other duct 7 is also provided with an outlet 9.

FIG. 3 shows a partial detailed cross section. The reinforcing member 4 is provided in the opening on the side surface of the duct, and the collar portions 11, 12 are provided in this opening.
And the collar portions 13 and 14 are fixed to the respective ends of the X-ray generation plate 1 and the back surface material 2 by welding. And each collar part 1
Tighten 1 and 13 and flanges 12 and 14 with bolts through the O-ring. As a result, the voids 3 are secured at the left and right ends of the X-ray generation plate 1 and the back surface material 4.

When the accelerating electrons 15 are applied to the X-ray generation plate 1, bremsstrahlung X-rays are emitted from here. The X-rays are emitted from the backing material 2 to the outside through the void 3.

The scattered X-rays from the X-ray generation plate 1 are directed outward on the left and right sides with respect to the irradiation direction of the accelerated electrons, but are shielded by the ducts 6 and 7 there. That is, the ducts 6 and 7 provide the same shielding effect as the shielding plate 66 in FIG. Therefore, the conventional shield plate 66 is unnecessary, and the ducts 6 and 7 also serve as a structure for this shield.

Since the X-ray generation plate 1 and the back surface material 2 are flat, it is possible to avoid that the X-rays emitted from the back surface material 2 are absorbed by the frame as shown in FIG. Become.

The cooling water flows through the duct 6, the air gap 3 and the duct 7. In this process, the X-ray generation plate 1 is cooled. In this case, this waterway does not have a staggered shape as shown in Fig. 5,
High pressure is not required for circulation of cooling water.

Since the X-ray generation plate 1 is reinforced with respect to the backing material 2,
The backing material 2 does not need to be very thick. Therefore, the amount of X-rays absorbed by the back surface material 2 can be small.
Therefore, the X-ray utilization rate is higher than that of the conventional configuration.

(Effect of the Invention) As described in detail above, according to the present invention, there is an effect that the X-ray utilization rate is high and the shielding plate for scattered X-rays is unnecessary by a simple structure.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a plan view of the same, FIG. 3 is a partially enlarged sectional view, and FIG. 4 is a sectional view of a conventional example. FIG. 5 is the same plan view, FIG. 6 is a sectional view of another conventional example, and FIG. 7 is the same plan view. 1 ... X-ray generation plate, 2 ... Backing material, 3 ... Void, 4 ...
Reinforcement material, 6,7 ... duct,

Claims (1)

[Scope of utility model registration request] 1. A flat back surface material is disposed on the back surface of a flat X-ray generation plate whose front surface is irradiated with accelerated electrons, with a gap serving as a cooling water channel interposed therebetween. The X-ray generation plate and the back surface material are connected by spot welding at a plurality of locations other than the left and right ends with respect to the irradiation direction of the accelerated electrons so as to be reinforced by the back surface material. A duct for cooling water, which bulges toward the surface side of the X-ray generation plate and also shields scattered X-rays toward the left and right sides with respect to the irradiation direction of the accelerated electrons, is provided on the left and right sides with respect to the irradiation direction, An X-ray target formed by communicating the inside of the duct with the void.