Dual-source irradiation device

Abstract

The utility model provides a double-source irradiation device comprising an output device body which is provided with a ray output channel; the source pull rod can be inserted into the output device body, the source pull rod comprises at least a plurality of shielding bodies and scattering cavities among the shielding bodies, and radioactive sources are arranged in the scattering cavities; and the source pull rod can be pulled relative to the output device body, so that the ray output channel is aligned with the scattering cavity part or the shielding body part. According to the double-source irradiation device, through the movement of the source rod and the cooperation of the shielding body and the attenuator, the rays of the two radioactive sources can be output at the output port, so that the calibration point of a gamma ray reference radiation field is doubled compared with the original calibration point.

Description

Technical Field

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

[0002] Gamma-ray reference radiation fields are 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. Radiation source irradiation devices in gamma-ray reference radiation fields are generally divided into single-source devices and multi-source devices.

[0003] Single-source devices are generally gamma radiation sources with high activity. The dose rate range of their calibration points is limited, typically covering 2-3 orders of magnitude (calibration points). The radiation source with the corresponding activity can be selected based on the maximum calibration point to be achieved, but it cannot reach calibration points with smaller orders of magnitude.

[0004] Multi-source devices typically include 4-5 radioactive sources, and their calibration points cover a wide range, generally up to 6 orders of magnitude (calibration points). However, considering protection and the continuity of orders of magnitude, the activity of the radioactive sources is usually not very high. Therefore, the smallest calibration point can be achieved, but the largest calibration point cannot be reached.

[0005] Considering the advantages and disadvantages of single-source and multi-source devices, it is essential to design a device with a large calibration point range that can cover multiple orders of magnitude (calibration points). Utility Model Content

[0006] To address the aforementioned problems in the existing technology, this utility model provides a dual-source irradiation device, comprising:

[0007] The output device body is provided with a ray output channel;

[0008] and a source rod that can be inserted into the output body, the source rod including at least a plurality of shields and a scattering cavity between the plurality of shields, wherein a radiation source is provided in the scattering cavity;

[0009] The source lever is pullable relative to the output body, so that the ray output channel is aligned with the scattering cavity or the shielding part.

[0010] In some embodiments, the source rod includes an outer shell and at least three shields disposed within the outer shell, the hollow portion between the first shield and the second shield forming a first scattering cavity, and the hollow portion between the second shield and the third shield forming a second scattering cavity.

[0011] In some embodiments, the length of the second shield is greater than that of the ray output channel.

[0012] In some embodiments, the first shield, the second shield, and the third shield are respectively sandwiched between two stainless steel plates on their respective sides, and the stainless steel plates are fixed to the outer shell.

[0013] In some embodiments, the first shield, the second shield, and the third shield are cylindrical.

[0014] In some embodiments, the first scattering cavity is provided with a first built-in attenuator and a first radiation source, and the second scattering cavity is provided with a second built-in attenuator and a second radiation source, with the first built-in attenuator located below the first radiation source and the second built-in attenuator located below the second radiation source.

[0015] In some embodiments, the first scattering cavity and the second scattering cavity are further provided with attenuator housings, and the first radiation source and the first built-in attenuator, as well as the second radiation source and the second built-in attenuator, are respectively placed inside the attenuator housings.

[0016] In some embodiments, the attenuator housing is fixed to the outer shell, and the first and second built-in attenuators are fixed to the corresponding attenuator housings.

[0017] In some embodiments, the first and second built-in attenuators may be replaced with built-in attenuators of different thicknesses depending on the attenuation factor.

[0018] In some embodiments, the outer shells opposite to the first scattering cavity and the second scattering cavity are respectively provided with a first ray outlet and a second ray outlet, and the first ray outlet and the second ray outlet are through holes of different sizes.

[0019] Compared with the prior art, the advantages and beneficial effects of this utility model are as follows:

[0020] The dual-source irradiation device provided by this invention, through the movement of the source rod and the cooperation of the shield and attenuator, enables the rays from both radiation sources to be output at the output port, thereby doubling the number of calibration points for the gamma-ray reference radiation field compared to the original.

[0021] This invention provides a dual-source irradiation device that combines the advantages and disadvantages of single-source and multi-source devices. By optimizing the output device design and selecting different radiation sources, it offers a device with a larger calibration point range, covering four orders of magnitude (calibration points). This increases the number of calibration points for the gamma-ray reference radiation field by two orders of magnitude compared to the original single-source device, supplementing the low-dose-rate calibration points of the single-source device. This dual-source irradiation device saves on the cost of the gamma-ray reference radiation field and improves the calibration efficiency of the instrument. Attached Figure Description

[0022] 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.

[0023] Figure 1 This is a schematic diagram of the dual-source irradiation device shown in an embodiment of the present invention. Figure 1 (Output from the first radioactive source);

[0024] Figure 2 This is a schematic diagram of the dual-source irradiation device shown in an embodiment of the present invention. Figure 2 (Turn off the ray);

[0025] Figure 3 This is a schematic diagram of the dual-source irradiation device shown in an embodiment of the present invention. Figure 3 (Output from the second radioactive source);

[0026] Figure 4 This is a schematic diagram of the source tie rod structure shown in an embodiment of the present utility model;

[0027] in:

[0028] 1- Output unit;

[0029] 11-ray output channel;

[0030] 2-Source tie rod;

[0031] 21-Outer shell;

[0032] 22-First shielding body;

[0033] 23-Second shielding body;

[0034] 24 - Third shielding body;

[0035] 25 - First scattering cavity;

[0036] 251 - First built-in attenuator;

[0037] 252 - First radioactive source;

[0038] 26 - Second scattering cavity;

[0039] 261 - Second built-in attenuator;

[0040] 262 - Second radioactive source;

[0041] 27- Stainless steel sheet;

[0042] 28 - Attenuator housing;

[0043] 31 - First ray exit;

[0044] 32 - Second ray exit. Detailed Implementation

[0045] 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.

[0046] 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.

[0047] 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.

[0048] See Figure 1-4 This embodiment provides a dual-source irradiation device, including: an output body 1, the output body 1 having a radiation output channel 11; and a source pull rod 2 that can be inserted into the output body 1, the source pull rod 2 including at least a plurality of shields and a scattering cavity between the plurality of shields, the scattering cavity having a radiation source; the source pull rod 2 is pullable relative to the output body 1, so that the radiation output channel 11 is aligned with the scattering cavity portion or the shield portion.

[0049] In this embodiment, the output device body 1 is mainly made of lead or tungsten steel with high atomic number, and the radiation source 3 is a gamma radiation source, such as Cs-137 or Co-60.

[0050] The source lever 2 includes an outer shell 21 and at least three shielding bodies disposed within the outer shell 21. The hollow portion between the first shielding body 22 and the second shielding body 23 forms a first scattering cavity 25, and the hollow portion between the second shielding body 23 and the third shielding body 24 forms a second scattering cavity 26. The length of the second shielding body 23 is greater than the radiation output channel 11. In this embodiment, the two hollow portions of the source lever 2 are scattering cavities, which can reduce radiation source scattering. The length of the shielding body (second shielding body 23) in the middle of the source lever 2 is greater than the diameter of the radiation output channel 11. When the source lever 2 is pushed to the middle position, the radiation is completely blocked. In this embodiment, the output device body 1, except for the left and right sides and the front radiation output channel, has a shielding layer to shield the radiation source. After the source lever 2 is inserted, when the radiation source is aligned with the radiation output channel 11, the radiation can only be emitted from the radiation output channel 11.

[0051] In this embodiment, the outer shell 21 of the source rod 2 is made of stainless steel with good strength to enhance the strength of the source rod 2; the shield is made of lead or tungsten steel with high atomic number, which has shielded the radiation on the left and right sides.

[0052] In this embodiment, the first shield 22, the second shield 23 and the third shield 24 are respectively sandwiched by stainless steel plates 27 on both sides. The stainless steel plates 27 are welded and fixed to the outer shell 21. The first shield 22, the second shield 23 and the third shield 24 are cylindrical.

[0053] In this embodiment, the first scattering cavity 25 is provided with a first built-in attenuator 251 and a first radiation source 252, and the second scattering cavity 26 is provided with a second built-in attenuator 261 and a second radiation source 262. The first built-in attenuator 251 is located below the first radiation source 252, and the second built-in attenuator 261 is located below the second radiation source 262.

[0054] The first scattering cavity 25 and the second scattering cavity 26 are further provided with attenuator housings 28. The first radiation source 252 and the first built-in attenuator 251, as well as the second radiation source 262 and the second built-in attenuator 261, are respectively placed inside the attenuator housings 28. The attenuator housings 28 are welded and fixed to the outer shell 21. The first built-in attenuator 251 and the second built-in attenuator 261 are respectively fixed to the corresponding attenuator housings 28, for example, by threads or welding. The first built-in attenuator 251 and the second built-in attenuator 261 can be replaced with built-in attenuators of different thicknesses according to different attenuation factors.

[0055] In this embodiment, the built-in attenuator is made of lead or tungsten steel with a high atomic number, used to attenuate the radiation beam from the radiation source. The attenuator housing is made of stainless steel and used to fix the built-in attenuator.

[0056] In this embodiment, the outer shell opposite to the first scattering cavity 25 and the second scattering cavity 26 are respectively provided with a first ray outlet 31 and a second ray outlet 32. The first ray outlet 31 and the second ray outlet 32 ​​are through holes of different sizes. In this embodiment, the first ray outlet 31 is smaller than the second ray outlet 32.

[0057] See Figure 2 At this time, the radiation is off; push the source lever, and the first radiation source 252 is aligned with the radiation output channel 11 (see...). Figure 1 At this time, the first radiation source 252 outputs radiation, while the second radiation source 262 is completely blocked and in the off state; pulling the source lever 2, the second radiation source 262 is aligned with the radiation output channel 11 (see...). Figure 3 At this time, the second radiation source 262 outputs radiation, while the first radiation source 252 is completely blocked and is in a closed state.

[0058] By pulling the source lever 2, the first radiation source 252, the second shield 23 (the shield in the middle), and the second radiation source 262 can be aligned with the radiation output channel 11, thereby achieving three states: obtaining radiation from the first radiation source, turning off the radiation source, and obtaining radiation from the second radiation source.

[0059] The structural design of the dual-source irradiation device provided in this embodiment can increase the number of γ-ray reference radiation fields that can be calibrated, save costs, and improve calibration efficiency.

[0060] 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 dual-source irradiation device, characterized in that: include: The output device body is provided with a ray output channel; and a source rod that can be inserted into the output body, the source rod including at least a plurality of shields and a scattering cavity between the plurality of shields, wherein a radiation source is provided in the scattering cavity; The source lever is pullable relative to the output body, so that the ray output channel is aligned with the scattering cavity or the shielding part.

2. The dual-source irradiation device according to claim 1, characterized in that: The source rod includes an outer shell and at least three shields disposed within the outer shell. The hollow portion between the first shield and the second shield forms a first scattering cavity, and the hollow portion between the second shield and the third shield forms a second scattering cavity.

3. The dual-source irradiation device according to claim 2, characterized in that: The length of the second shield is greater than that of the radiation output channel.

4. The dual-source irradiation device according to claim 2, characterized in that: The first shield, the second shield, and the third shield are respectively sandwiched between two stainless steel plates on their respective sides, and the stainless steel plates are fixed to the outer shell.

5. The dual-source irradiation device according to claim 2, characterized in that: The first shield, the second shield, and the third shield are cylindrical.

6. The dual-source irradiation device according to claim 2, characterized in that: The first scattering cavity is provided with a first built-in attenuator and a first radiation source, and the second scattering cavity is provided with a second built-in attenuator and a second radiation source. The first built-in attenuator is located below the first radiation source, and the second built-in attenuator is located below the second radiation source.

7. The dual-source irradiation device according to claim 6, characterized in that: The first scattering cavity and the second scattering cavity are further provided with attenuator housings, and the first radiation source and the first built-in attenuator, as well as the second radiation source and the second built-in attenuator, are respectively placed inside the attenuator housings.

8. The dual-source irradiation device according to claim 7, characterized in that: The attenuator housing is fixed to the outer shell, and the first and second built-in attenuators are respectively fixed to the corresponding attenuator housings.

9. The dual-source irradiation device according to claim 6, characterized in that: The first and second built-in attenuators can be replaced with built-in attenuators of different thicknesses depending on the attenuation factor.

10. The dual-source irradiation device according to claim 2, characterized in that: The first scattering cavity and the second scattering cavity are respectively provided on the outer shell on opposite sides of the first ray outlet and the second ray outlet, which are through holes of different sizes.

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