Source rotating shaft and radioactive source irradiation device

Abstract

The utility model provides a source rotating shaft, which comprises a source rotating shaft shell and a spherical scattering cavity arranged in the source rotating shaft shell, a first shielding body and a second shielding body are further arranged in the source rotating shaft shell, the spherical scattering cavity is arranged between the first shielding body and the second shielding body, a radioactive source is arranged in the spherical scattering cavity, and the first shielding body and the second shielding body are arranged in the source rotating shaft shell. The source rotating shaft shell is provided with a first ray output port and a second ray output port, and the spherical scattering cavity is provided with two through holes which can respectively correspond to the first ray output port and the second ray output port. According to the radioactive source irradiation device provided by the utility model, the spherical scattering cavity is designed in the source rotating shaft, so that the ray scattering of the output port of the irradiation device is reduced, the shielding effect except the output port is increased, the shielding effect is more uniform, and the scattering generated by the radioactive source irradiation device is reduced.

Description

Technical Field

[0001] This utility model relates to a gamma-ray reference radiation field, and more particularly to a source rotation shaft and a radiation source irradiation device. Background Technology

[0002] The gamma-ray reference radiation field is used for the calibration of radiation protection dosimeters and dose rate meters, the calibration of personal dosimeters, and the determination of the energy response of dosimeters and dose rate meters. Therefore, the accuracy and uncertainty of the reference radiation field have a great impact on the calibration efficiency of the radiation field. Generally, the scattering effect of the gamma-ray reference radiation field should not exceed 5%.

[0003] The gamma-ray reference radiation field mainly consists of a radiation source irradiation device, a track positioning system and integrated control system, an intelligent vehicle positioning device, safety interlocks, and video monitoring devices. Scattering primarily originates from the radiation source irradiation device, the equipment layout of the site, and auxiliary facilities within the radiation field. Currently, research into reducing scattering generated by the radiation source irradiation device through optimized structural design is essential. Utility Model Content

[0004] To address the aforementioned problems in the existing technology, this utility model provides a source shaft, comprising: a source shaft housing and a spherical scattering cavity disposed inside the source shaft housing. The source shaft housing also provides a first shield and a second shield. The spherical scattering cavity is positioned between the first shield and the second shield. A radiation source is placed inside the spherical scattering cavity. The source shaft housing has a first radiation output port and a second radiation output port. The spherical scattering cavity has two through holes, which correspond to the first radiation output port and the second radiation output port, respectively.

[0005] In some embodiments, the spherical scattering cavity includes an upper scattering cavity and a lower scattering cavity, both of which are hemispherical with a certain thickness. An annular groove is provided at the junction of the upper and lower scattering cavities, and a clamp is used to tighten them.

[0006] In some embodiments, the upper scattering cavity has a first circular through hole at the top of the sphere, and the lower scattering cavity has a second circular through hole at the top of the sphere, the second circular through hole having the same diameter as the second ray output port.

[0007] In some embodiments, the diameter of the first circular through hole is larger than the diameter of the second circular through hole.

[0008] In some embodiments, the source shaft further includes an attenuator and an attenuator housing, the attenuator housing being fixed to the source shaft housing, and the attenuator being fixed to the attenuator housing.

[0009] In some embodiments, the first circular through-hole is aligned with the outer diameter of the attenuator housing, making the spherical scattering cavity non-rotatable, and the radiation source is placed inside the attenuator housing.

[0010] In some embodiments, both the first shield and the second shield have hemispherical recesses, which form a spherical space whose size is consistent with the outer diameter of the spherical scattering cavity.

[0011] In some embodiments, the spherical space is also provided with two through holes, which correspond to the first circular through hole and the second circular through hole of the spherical scattering cavity, respectively.

[0012] In some embodiments, the spherical scattering cavity is made of tungsten steel.

[0013] This utility model also provides a radiation source irradiation device, including the source rotating shaft as described above. The radiation source irradiation device further includes an output body, the output body is provided with a radiation output channel, the source rotating shaft is inserted into the output body and is rotatable relative to the output body, such that the first radiation output port is aligned with the radiation output channel, or the second radiation output port is aligned with the radiation output channel.

[0014] Compared with the prior art, the advantages and beneficial effects of this utility model are as follows:

[0015] The radiation source irradiation device provided by this utility model has a spherical scattering cavity designed in the source rotation shaft, which reduces the scattering of rays from the output port of the irradiation device, increases the shielding effect except for the output port, and makes the shielding effect more uniform, thereby reducing the scattering generated by the radiation source irradiation device. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the source shaft structure shown in an embodiment of the present utility model. Figure 1 ;

[0018] Figure 2 This is a schematic diagram of the source shaft structure shown in an embodiment of the present utility model. Figure 2 ;

[0019] in:

[0020] 1-Source shaft housing;

[0021] 11-First shielding body;

[0022] 12-Second shielding body;

[0023] 13 - First ray output port;

[0024] 14 - Second ray output port;

[0025] 2-Spherical scattering cavity;

[0026] 21-Radioactive source;

[0027] 22-Upward scattering cavity;

[0028] 221 - First circular through hole;

[0029] 23-Downward scattering cavity;

[0030] 231 - Second circular through hole;

[0031] 24-Clamping hoop;

[0032] 3-Attenuator;

[0033] 4. Attenuator housing. Detailed Implementation

[0034] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments to further understand the purpose, solution and effect of this utility model, but it is not intended to limit the scope of protection of the appended claims of this utility model.

[0035] Certain terms are used in this specification and the following claims to refer to specific components or parts. Those skilled in the art will understand that users or manufacturers may use different names or terms to refer to the same component or part. This specification and the following claims do not distinguish components or parts by differences in name, but rather by differences in function. The terms "comprising" and "including" used throughout this specification and the following claims are open-ended and should be interpreted as "including but not limited to". Furthermore, the term "connection" here includes any direct and indirect electrical connection means. Indirect electrical connection means include connections made through other means.

[0036] It should be noted that in the description of this utility model, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", as well as "about", "approximately", "substantially", "left and right", etc., indicating the orientation or positional relationship or parameters, are all based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, a specific size, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0037] See Figure 1-2 This embodiment provides a source shaft, including: a source shaft housing 1 and a spherical scattering cavity 2 disposed inside the source shaft housing 1. The source shaft housing 1 is also provided with a first shield 11 and a second shield 12. The spherical scattering cavity 2 is placed between the first shield 11 and the second shield 12. A radiation source 21 is placed inside the spherical scattering cavity 2. The source shaft housing 1 is provided with a first radiation output port 13 and a second radiation output port 14. The spherical scattering cavity 2 is provided with two through holes, which can correspond to the first radiation output port 13 and the second radiation output port 14, respectively.

[0038] The spherical scattering cavity 2 is made of tungsten steel, see [reference]. Figure 2 Due to current limitations in tungsten steel processing technology, it is impossible to directly produce a complete spherical tungsten steel. Therefore, the spherical scattering cavity 2 is divided into upper and lower parts. Specifically, the spherical scattering cavity 2 includes an upper scattering cavity 22 and a lower scattering cavity 23. Both the upper scattering cavity 22 and the lower scattering cavity 23 are hemispherical with a certain thickness. There is an annular groove at the junction of the upper scattering cavity 22 and the lower scattering cavity 23, which is clamped together by a clamp 24. After merging, they form the spherical scattering cavity 2. The upper scattering cavity 22 has a first circular through hole 221 at its spherical tip, and the lower scattering cavity 23 has a second circular through hole 231 at its spherical tip. The diameter of the second circular through hole 231 is the same as the diameter of the second ray output port 14 of the source shaft housing 1. The diameter of the first circular through hole 221 is larger than the diameter of the second circular through hole 231.

[0039] In this embodiment, the source shaft further includes an attenuator 3 and an attenuator housing 4. The attenuator housing 4 is fixed to the source shaft housing 1, and the attenuator 3 is fixed to the attenuator housing 4. The first circular through-hole 221 has the same outer diameter as the attenuator housing 4, making the spherical scattering cavity 2 non-rotatable. The radiation source 21 is placed inside the attenuator housing 4. See also Figure 1The attenuator housing 4 is inserted and welded to the source shaft housing 1. The attenuator housing 4 has internal threads. After the radiation source 21 is inserted, the attenuator 3 can be tightened and fixed. The upper hole of the scattering cavity is consistent with the outer diameter of the attenuator housing, so that the scattering cavity cannot be rotated and the scattering cavity is completely fixed.

[0040] Both the first shield 11 and the second shield 12 have hemispherical recesses. When the two shields are aligned, the two hemispherical recesses form a spherical space. The size of the spherical space is the same as the outer diameter of the spherical scattering cavity, which can prevent displacement of the scattering cavity, but cannot prevent its rotation. The spherical space also has two through holes, which correspond to the first circular through hole 221 and the second circular through hole 231 of the spherical scattering cavity, respectively.

[0041] In this embodiment, the source shaft housing 1, the attenuator housing 4, and the clamp 24 are made of stainless steel, which has a certain strength and good corrosion resistance. The shielding material is lead or tungsten steel, and the attenuator 3 is made of tungsten steel.

[0042] Another embodiment of the present invention provides a radiation source irradiation device, including a source rotating shaft as described above. The radiation source irradiation device further includes an output body, the output body having a radiation output channel, the source rotating shaft being inserted into the output body and rotatable relative to the output body, such that the first radiation output port is aligned with the radiation output channel, or the second radiation output port is aligned with the radiation output channel.

[0043] In summary, the source shaft of the radiation source irradiation device provided by this utility model is designed with a spherical scattering cavity made of tungsten steel. Tungsten steel can absorb more gamma rays than materials such as stainless steel and lead. The spherical shape makes it more difficult for the generated scattered rays to pass through the output port, thereby reducing the scattering at the output port. Compared with a cylindrical scattering cavity, more shielding is added at the corners of the scattering cavity, and the shielding effect of the spherical scattering cavity is more uniform. Under the premise of the same diameter, the spherical scattering cavity has a better shielding effect due to its geometric advantages.

[0044] This invention reduces the scattering of rays from the output port of the irradiation device by designing a spherical scattering cavity, and increases the shielding effect outside the output port, thereby reducing the scattering generated by the radiation source irradiation device.

[0045] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A source shaft, characterized in that: include: The source shaft housing and the spherical scattering cavity disposed inside the source shaft housing are provided. The source shaft housing is also provided with a first shield and a second shield. The spherical scattering cavity is placed between the first shield and the second shield. The spherical scattering cavity is filled with a radiation source. The source shaft housing is provided with a first radiation output port and a second radiation output port. The spherical scattering cavity is provided with two through holes, which can correspond to the first radiation output port and the second radiation output port, respectively.

2. The source shaft according to claim 1, characterized in that: The spherical scattering cavity includes an upper scattering cavity and a lower scattering cavity. Both the upper and lower scattering cavities are hemispherical with a certain thickness. There is an annular groove at the junction of the upper and lower scattering cavities, which is tightened by a clamp.

3. The source shaft according to claim 2, characterized in that: The upper scattering cavity has a first circular through hole at the top of the sphere, and the lower scattering cavity has a second circular through hole at the top of the sphere. The diameter of the second circular through hole is the same as that of the second ray output port.

4. The source shaft according to claim 3, characterized in that: The diameter of the first circular through hole is larger than the diameter of the second circular through hole.

5. The source shaft according to claim 3, characterized in that: The source shaft also includes an attenuator and an attenuator housing, the attenuator housing being fixed to the source shaft housing, and the attenuator being fixed to the attenuator housing.

6. The source shaft according to claim 5, characterized in that: The first circular through-hole is consistent with the outer diameter of the attenuator housing, so that the spherical scattering cavity cannot be rotated, and the radiation source is placed inside the attenuator housing.

7. The source shaft according to claim 3, characterized in that: Both the first and second shields have hemispherical recesses, which together form a spherical space whose size is the same as the outer diameter of the spherical scattering cavity.

8. The source shaft according to claim 7, characterized in that: The spherical space is also provided with two through holes, which correspond to the first and second circular through holes of the spherical scattering cavity, respectively.

9. The source shaft according to claim 1, characterized in that: The spherical scattering cavity is made of tungsten steel.

10. A radiation source irradiation device, characterized in that: Including the source rotating shaft as described in any one of claims 1-9, the radiation source irradiation device further includes: an output body, the output body having a radiation output channel, the source rotating shaft being inserted into the output body and rotatable relative to the output body, such that the first radiation output port is aligned with the radiation output channel, or the second radiation output port is aligned with the radiation output channel.

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