JPS60148039A - Rotary paired cathode - Google Patents

Abstract

PURPOSE:To rapidly perform the X-ray measurement by providing the same or different kinds of targets on the respective surfaces of a rotary body having plural surfaces not on the same plane in order to simultaneously take out plural X-rays. CONSTITUTION:The rotary paired cathode in an X-ray device, which makes the electrons from the cathode to be acclerated for being collided with targets in a state of high-speed rotation in order to generate X-rays, is formed by providing different targers 21-24 on the surfaces not on the same plane of a rotary body 10. And the accelerated electrons 25-28 are made to be collided for generating the X-rays 29-32 while preventing mutual interference of the X-rays 29-32 by providing the sluice plates 33-35. Accordingly, the plural kinds of different X-rays can be taken out while preventing mutual interference by simple sluice plates so as not to require to exchange the rotary paired cathode nor to require regulation thus enabling to rapidly and efficiently perform various X-ray measurements.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to the structure of a rotating anode cathode used in an X-ray generator.

Conventional configuration and its problems X-ray generators having a rotating anticathode can extract high-output X-rays, so their utility value has increased in recent years. A rotating anticathode is an anode in which electrons generated at the cathode are accelerated and collided with a high-speed rotating anode (or anticathode) made of metal, that is, a target.
It generates X-rays specific to metals.

Since the conventional rotating anode is composed of a single target, it has the following problems.

(1) Depending on the purpose of the measurement, the rotating anode has to be replaced by a rotating anode composed of another target. At that time, the system including the rotating anode cathode must be returned to atmospheric pressure, the rotating anode cathode must be replaced, and then the system must be evacuated again, which takes a considerable amount of time.

(2) With the replacement of the one-rotation anticathode, it is necessary to adjust the optical axes of the X-ray diffractometer to align them in order to achieve X-ray collimation, that is, maximum X-ray intensity.

(3) In an X-ray optical system, if a monochromator is set to make X-rays monochromatic, each time the rotating anode is replaced with a rotating anode composed of a different target, the single crystal in the monochromator is requires rotation and adjustment according to the wavelength of the X-ray.

Thus, the conventional rotating anode cathode composed of a single target is inconvenient to replace because it requires evacuation time and delicate adjustments each time the rotating anode cathode is replaced.

Therefore, a structure shown in FIG. 1, in which a plurality of mutually different targets are provided, can be considered. That is, a rotating anticathode in which different targets 2 to 6 are formed on the surface of the cylindrical rotating body 1 is considered. However, this structure has the following drawbacks.

(1) Target 2 ~ on the common surface of the cylindrical rotating anticathode
6, even if a metal partition plate is used, mutual interference of X-rays generated from different types of targets, such as targets 2 and 3 in the figure, cannot be prevented. The same situation holds true for two types of targets.

(2) In order to prevent the situation in (1) as much as possible, it is possible to maintain a sufficient distance between targets. This is the same as installing dissimilar metals between the targets, and as a result, the number of targets is increased by one, which in turn generates extra X-rays.

In addition, increasing the size of the rotating anticathode significantly reduces the thermal efficiency of the anticathode cooling water and increases the inertial mass.
As a result, a powerful rotation motor is required, and no great effect is brought about.

OBJECTS OF THE INVENTION In view of these conventional problems, it is an object of the present invention to provide a rotating anticathode that can perform various X-ray measurements quickly and efficiently.

Structure of the Invention The present invention provides a plurality of targets of the same type or different types on each surface of a rotating body having a plurality of surfaces that are not on the same plane, and a plurality of X-rays of the same type or different types are provided at a time. This provides a rotating anode that can be taken out.

Description of examples.

The present invention will be explained below using examples. FIG. 2 shows a rotating anticathode in which two types of targets 11.12 made of different elements are attached to five surfaces of a rotating body 10 that are not on the same plane, 13 is a partition plate, 14.15 is a thermoelectron, and 16.17 is an X-ray. In FIG. 2, thermionic electrons 14.15 emitted from two cathodes (not shown) are accelerated and collide with the metal targets, ) 11.12, respectively, causing X-rays 1, . 6 and 17 are generated. The partition metal 13 is provided to prevent these two types of X-rays 16 and 17 from interfering with each other.

Next, FIG. 3 shows an embodiment of a rotating anode consisting of four or more targets.

In FIG. 3, different targets 21, 22, 23, 24 are installed on the surface of the rotating body 10. 25-2
8 indicates an accelerated thermionic electron. 36 indicates the direction of rotation of the rotating counterelectrode.

In this manner, in the structures shown in FIGS. 2 and 3, since the targets are not on the same plane, X-rays can be extracted without mutual interference using a simple partition plate. Also,
By using a rotating polyhedron as the target, it is possible to provide four or more targets of the same type or mutually different types, and to extract a plurality of X-rays of the same type or mutually different types at the same time.

Note that the plurality of targets do not necessarily have to be of different types, and may be of the same type.

Effects of the Invention (1) - A plurality of X-rays of the same type or mutually different types can be taken out at the same time, allowing efficient measurement. In particular, when different types of X-rays are taken out, measurements for various purposes can be performed simultaneously, which is an advantage not seen in the prior art.

? ) There is no need to replace the rotating anode cathode depending on the purpose of measurement, so the troublesome adjustments described in the conventional example can be saved.

(3) Since the targets are bent to each other, mutual interference between different types of X-rays can be prevented by a simple metal partition.

(4) Since there is no need to provide a particular distance between the targets, the inertial mass of the rotating anode does not increase.

[Brief explanation of drawings]

Figures 1A and B are external front and side views of the rotating anode.
3 are external front views of a rotating counter electrode according to an embodiment of the present invention. 14.15.25-28... thermoelectron, 11. . 12゜21~24...Target, 16, 1
7, 29-32...Xa, 13r3"3-3
1-... Partition metal. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (2)

[Claims] (1) A plurality of targets of the same type or mutually different types are provided on each surface of a rotating body having a plurality of surfaces that are not the same plane, and a plurality of X-rays of the same type or mutually different types are emitted to the targets at once. A rotating anode constructed as follows. (2) The rotating anticathode according to claim 1, wherein a partition plate is installed at the boundary of the target to prevent interference between X-rays.