CN-116682590-B - Modulator radiation shielding device

CN116682590BCN 116682590 BCN116682590 BCN 116682590BCN-116682590-B

Abstract

The invention provides a modulator ray shielding device which is used for accommodating a modulator. The modulator ray shielding device comprises a lower shielding body module and at least two middle shielding body modules which are overlapped one by one, wherein each middle shielding body module comprises a shielding frame and a shielding pipe, and the joint parts of the middle shielding body module and the lower shielding body module are mutually embedded. The shielding device comprises an upper shielding body module, a lower shielding body module, a middle shielding body module and an upper shielding body module, wherein metal partition plates for blocking rays from penetrating are arranged in the walls of the lower shielding body module, the middle shielding body module and the upper shielding body module, and the metal partition plates are at least partially overlapped at the mutually embedded parts. The lower shielding body module, the plurality of middle shielding body modules and the upper shielding body module are combined to form a shielding device for accommodating the modulator, and radiation penetration is comprehensively blocked by the metal partition plate embedded in the shielding device, so that the modulator can work and operate normally and is not influenced by radiation. The metal diaphragm surrounds the hollow cavity structure and forms a labyrinth type ray blocking structure at the joint.

Inventors

FAN LINXIA
WU XIAOJIE
MENG XIANGYU
LI XUEXIAN
WANG FEI
JIANG HAI
YIN ZHENG
HOU JING
LIU ZAN
Xu Zanjing

Assignees

北京机械工业自动化研究所有限公司

Dates

Publication Date: 20260512
Application Date: 20230612

Claims (11)

1. A modulator radiation shielding device for housing a modulator, the modulator radiation shielding device comprising: A lower shield module; The middle shielding body modules comprise annular shielding frames and shielding pipes distributed on the shielding frames, the middle shielding body modules are overlapped on the lower shielding body modules, and the combining parts of the middle shielding body modules and the lower shielding body modules are mutually embedded; An upper shielding body module which is buckled on the middle shielding body module, the joint parts of the middle shielding body module and the upper shielding body module are mutually embedded, wherein, The wall bodies of the lower shielding body module, the middle shielding body module and the upper shielding body module are respectively internally provided with a metal partition board for blocking rays from penetrating, and the metal partition boards are at least partially overlapped at the mutually embedded parts; The middle shielding body module comprises a middle retainer with a thin wall in an annular shape, the metal partition plate comprises at least two middle side partition plates which are combined into an annular shape and are embedded into the middle retainer, two ends of the middle shielding body module respectively form a first step part and a second step part, the first step part is used for being mutually embedded with the lower shielding body module, or the first step part is used for being mutually embedded with the second step part of the other middle shielding body module which is mutually overlapped.
2. The modulator radiation shielding device of claim 1, wherein the overlapping portion between the middle and lower shield modules is in a complementary stepped configuration.
3. The modulator radiation shielding device of claim 2, wherein the lower shielding body module comprises a bottom bracket and a bottom cover which are matched with each other, the metal partition plate comprises at least one bottom partition plate, the bottom partition plate is laid on the bottom bracket, the bottom cover is covered on the bottom partition plate and connected with the bottom bracket, the edges of the bottom cover and the bottom partition plate form a step structure, and the middle shielding body module is pressed on the at least one step structure of the bottom cover.
4. A modulator radiation shielding apparatus according to claim 3 wherein the lower shield module further comprises a bottom stage cover plate secured to the shoe, a lateral mounting groove is formed between the bottom stage cover plate and the shoe, the metal spacer plate comprises at least two bottom side spacers, the bottom side spacers are embedded in the lateral mounting groove, the bottom side spacers are press-fit to the step surface of the bottom cover, and the middle shield module is press-fit to the step structure of the bottom stage cover plate.
5. The modulator radiation shielding apparatus of claim 4, wherein said bottom spacers comprise four, and four of said bottom spacers are alternately connected in sequence to form a ring, and the ends of two adjacent bottom spacers have complementary stepped structures.
6. The modulator radiation shielding apparatus according to claim 1, wherein an end portion of the intermediate holder is provided as an intermediate step portion, and the intermediate side spacer is inserted into abutment with an inner side wall of the intermediate step portion at the other end of the intermediate holder.
7. A modulator radiation shielding apparatus as claimed in claim 1, wherein the junction of adjacent ones of said intermediate side baffles is of complementary stepped configuration.
8. The modulator radiation shielding device of claim 1, wherein the modulator radiation shielding device forms a hollow radiation shielding cavity, and wherein the shielding tubes are mounted to opposite sidewalls of the middle shielding body module.
9. The modulator radiation shielding device of claim 1, wherein the upper shield module comprises an upper cover covering the middle shield module, the metal separator comprises a top separator covering the upper cover and a top separator embedded in the upper cover, the top separator and the upper cover are fastened to the middle shield module, and the area of the top separator is larger than the area of the inner hole area of the middle shield module.
10. The modulator radiation shielding apparatus of claim 9, wherein the top spacer is fastened to the upper cover.
11. The modulator ray shielding apparatus of claim 9, wherein the upper shield module further comprises an upper shield covering the top baffle, a lateral edge of the upper shield being flush with a lateral edge of the upper cover.

Description

Modulator radiation shielding device Technical Field The invention relates to the technical field of radiation protection, in particular to a modulator ray shielding device. Background The high-energy ray nondestructive testing equipment accelerates electrons by microwaves, and the accelerated electrons bombard a target material with high atomic number and generate X rays with continuous energy spectrum. When the high-energy ray nondestructive detection equipment irradiates the detected workpiece by using the generated X-rays, the defects of the workpiece are detected by the principle that the attenuation of different densities and thicknesses is different. Some devices, especially devices with semiconductor devices, may be damaged due to interaction of high energy X-ray radiation with the substance during the detection process. Among them, the semiconductor device includes two effects after being irradiated: The first, total dose effect is the ionizing radiation effect of the accumulated radiation dose, which is the total absorbed energy level that a semiconductor device can withstand before significant changes in its characteristics occur. The semiconductor device is in an irradiation environment for a long time, trap charges are accumulated in the gate oxide layer and at the interface of the semiconductor device, the charges can cause the function degradation and even failure of the semiconductor device, and the total dose effect can cause the problems of transistor threshold voltage drift, field oxide edge leakage increase, transconductance reduction, channel and junction leakage current increase, gate oxide breakdown and the like. The second, dose-rate effect refers to the interaction of high dose-rate gamma rays and X-rays with the semiconductor device when they are incident on the semiconductor material, exciting secondary electrons and generating electron-hole pairs within the material. The dose rate effect is mainly to generate photoelectric effect, and cause larger photocurrent, and these extra photocurrents will cause logic function confusion, latch-up and even burnout of the digital circuit, and for analog circuit, output saturation, surge current in the power supply loop, etc. will cause circuit device failure. A common scenario for high-energy radiation detection is to separate the radiation source and the high-voltage modulator, wherein the radiation source is mounted in a dedicated radiation protection room and the high-voltage modulator is placed in another room, so that the high-voltage modulator is prevented from being irradiated by X-rays. With the development of modulator technology, the modulator is developed into an all-solid-state modulator, in particular to an induction superposition type solid-state modulator, an energy storage element is arranged at the primary side of a transformer, after a switch is triggered, primary capacitor discharge is boosted by a shunt ratio transformer, if the structure transmits high voltage through a high-voltage cable with hundreds of meters, pulse waveform is distorted, the input requirement of a magnetron is not met, and therefore, the modulator and a machine head are required to be placed together. However, there are no special shielded rooms in some applications such as oversized workpiece inspection, outdoor field inspection of nuclear power plants, etc. The charging unit and the control unit in the modulator are composed of various semiconductor elements, the modulator is irradiated by X rays in the outdoor field detection process, the semiconductor elements in the modulator are damaged due to the irradiation of the X rays, and the technical problem that the modulator works abnormally or even is damaged exists. Disclosure of Invention In order to solve the technical problem that the modulator in the prior art is difficult to block the radiation of rays under the outdoor condition, the invention provides a radiation shielding device of the modulator. A first aspect of the present invention provides a modulator radiation shielding apparatus for housing a modulator, the modulator radiation shielding apparatus comprising: A lower shield module; The middle shielding body modules comprise annular shielding frames and shielding pipes distributed on the shielding frames, the middle shielding body modules are overlapped on the lower shielding body modules, and the combining parts of the middle shielding body modules and the lower shielding body modules are mutually embedded; An upper shielding body module which is buckled on the middle shielding body module, the joint parts of the middle shielding body module and the upper shielding body module are mutually embedded, wherein, The lower shielding body module, the middle shielding body module and the upper shielding body module are respectively provided with a metal partition board for blocking rays from penetrating, and the metal partition boards are at least partially overlapped at the mutually embedded