A shutter device for radiation protection

Abstract

This invention provides a shutter device for radiation protection, comprising a shield, a light-emitting diode (LED), a photodiode, a collimator, and a driving and logic circuit. The collimator has an opening through which the shield extends. One end of the collimator has a channel for accommodating a fuel rod. The LED and the photodiode are arranged on the channel, and both are electrically connected to the driving and logic circuit. This invention provides shielding at critical points of X-ray leakage, eliminating the need for significantly increasing the thickness and area of ​​the shielding layer and for repeatedly switching the high-energy X-ray tube. This reduces equipment manufacturing and transportation costs, improves equipment operability, and extends equipment lifespan.

Description

Technical Field

[0001] This invention relates to the field of nuclear fuel element manufacturing technology for nuclear power plants, and in particular to a shutter device for radiation protection. Background Technology

[0002] In the inspection of fuel rods, equipment with high-energy X-ray tubes is frequently used to test product quality. If the high-energy X-rays generated are not shielded, they can harm personnel. In production practice, due to limitations in processing technology, manufacturing costs, transportation methods, and operating procedures, simply increasing the thickness and area of ​​the shielding layer is not advisable. Furthermore, frequently switching the high-energy X-ray tube on and off can damage the equipment itself. Therefore, inventing a shielding device that allows the equipment to operate continuously is the key to resolving these contradictions. Summary of the Invention

[0003] The purpose of this invention is to provide a shutter device for radiation protection, which solves the problems of increased equipment cost and shortened lifespan caused by the existing technology of increasing the thickness and area of ​​the shielding layer or switching high-energy X-ray tubes.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A shutter device for radiation protection includes a shield, a light-emitting diode (LED), a photodiode, a collimator, and a driving and logic circuit. The collimator has a hole through which the shield enters and exits. One end of the collimator has a channel for accommodating a fuel rod. The LED and the photodiode are arranged on the channel. The LED and the photodiode are electrically connected to the driving and logic circuit, respectively.

[0005] As one possible implementation, the shield is connected to a transmission device, which is connected to a rotary electromagnet, which is electrically connected to the drive and logic circuit.

[0006] As one possible implementation, the rotary electromagnet is a rotary electromagnet with a fixed rotation angle.

[0007] In one possible implementation, the light-emitting diode is arranged above the channel, and the photodiode is arranged below the channel.

[0008] As one possible implementation, the shield has a diameter of 10 mm and a height of 44 mm.

[0009] As one possible implementation, the shield is cylindrical in shape.

[0010] As one possible approach, the material of the shield is lead.

[0011] As one possible implementation, the collimator has a height of 88 mm and a length of 62.71 mm.

[0012] As one possible implementation, the right end of the fuel rod is positioned between the light-emitting diode and the photodiode.

[0013] As one possible implementation, the depth of the aperture in the collimator is 34 mm.

[0014] Compared with the prior art, the shutter device for radiation protection provided by the present invention has the following beneficial effects: This invention provides shielding at critical points where X-rays overflow, eliminating the need to significantly increase the thickness and area of ​​the shielding layer or repeatedly switch the high-energy X-ray tube on and off. This reduces equipment manufacturing and transportation costs, improves equipment operability, and extends equipment lifespan. Attached Figure Description

[0015] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the technical description will be briefly introduced below.

[0016] Figure 1 This is a schematic diagram of the shutter device for radiation protection provided by the present invention.

[0017] Explanation of reference numerals in the attached figures: 1. Rotary electromagnet; 2. Shielding; 3. Transmission device; 4. Light-emitting diode; 5. Photodiode; 6. Fuel rod; 7. Collimator; 8. Drive and logic circuit. Detailed Implementation

[0018] The following detailed description provides further details on specific implementation methods.

[0019] like Figure 1 As shown, this invention provides a shutter device for radiation protection, comprising a rotary electromagnet 1, a shield 2, a light-emitting diode 4, and a photodiode 5. A fuel rod 6 is provided at one end of a collimator 7, and a hole is formed in the collimator 7. Under the driving action of a transmission device 3, the shield 2 descends into or is lifted out of the hole. The rotary electromagnet 1 is connected to the transmission device 3, and the transmission device 3 is connected to the shield 2. The rotary electromagnet 1 is electrically connected to a drive and logic circuit 8, which is electrically connected to the light-emitting diode 4 and the photodiode 5. The light-emitting diode 4 and the photodiode 5 are respectively disposed at the upper and lower ends of the collimator 7, and one end of the fuel rod 6 is arranged between the light-emitting diode 4 and the photodiode 5.

[0020] Preferably, a channel for accommodating the end of the fuel rod 6 is provided at the left end of the collimator 7, and a light-emitting diode 4 and a photodiode 5 are respectively provided at the upper and lower ends of the channel.

[0021] The shield 2 is made of lead alloy and has a high mass absorption coefficient, effectively shielding X-rays. Simultaneously, the shield 2 has a certain mass (e.g., approximately 40 grams) so that it can return to its shielded state after the rotary electromagnet 1 is de-energized. During the testing process, the rotary electromagnet 1, via the transmission device 3, raises the shield 2 to remove its obstruction of X-rays. After the testing is completed, the rotary electromagnet 1 lowers the shield 2 to restore its X-ray blocking capability.

[0022] Preferably, the shield 2 has a diameter of 10 mm, a height of 44 mm, and is cylindrical in shape.

[0023] Preferably, the material of the shield 2 is lead.

[0024] Preferably, in order to increase the lifting speed of the shield 2 and facilitate control, a rotary electromagnet with a fixed rotation angle is used to drive the lifting of the shield 2.

[0025] Preferably, to ensure the X-ray beam can be effectively turned on only when the fuel rod 6 is in position, thus guaranteeing the radiation safety of personnel, the invention employs a detection pair consisting of a light-emitting diode 4 and a photodiode 5 (the light-emitting diode 4 and the photodiode 5 are a photoelectric detection pair) to determine whether the fuel rod 6 is in position, thereby controlling the operation of the rotary electromagnet 1. This control process is implemented using hardware circuitry, avoiding the uncertainties of software control and improving system reliability.

[0026] Based on the above design, this invention allows the high-energy X-ray tube to operate without switching on or off during fuel rod 6 inspection, avoiding equipment damage caused by frequent switching and ensuring the safety of personnel. The rotating electromagnet also ensures that in the event of an abnormal power outage, the shielding body can fall back to its designed position under gravity, effectively blocking X-ray emission.

[0027] Preferably, the collimator 7 has a height of 88 mm and a length of 62.71 mm.

[0028] The drive and logic circuit 8 is a standard existing product. Its function is to detect whether the fuel rod 6 is in place, and when the fuel rod 6 is in place, control the rotary electromagnet 1 to be in the conducting state, so that the shield 2 is lifted and X-rays are emitted.

[0029] The basic principle is that the electron emission gun ionizes the anode through thermal excitation to generate electrons. After being accelerated by an electric field, the electrons bombard the target material, causing the electrons to decelerate rapidly and generate high-energy X-rays.

[0030] The workflow of this invention is as follows: After the instrument is powered on, LED 4 is in working condition. When fuel rod 6 is not in the measuring position, photodiode 5 is turned on, rotary electromagnet 1 is de-energized, shield 2 falls, and X-rays are blocked.

[0031] When fuel rod 6 enters the measuring station, the light emitted by LED 4 is blocked, photodiode 5 is turned off, rotary electromagnet 1 is in the conducting state, shield 2 is lifted, and X-rays irradiate the break point of fuel rod through the collimator 7 aperture.

[0032] When the instrument is powered off, the rotary electromagnet 1 is de-energized, the shield 2 falls, and the collimator 7 hole is shielded.

[0033] Existing technologies primarily achieve reliable radiation protection through two methods: significantly increasing the thickness and area of ​​the shielding layer, and repeatedly switching the high-energy X-ray tube on and off. Significantly increasing the thickness and area of ​​the shielding layer increases manufacturing and transportation costs and reduces equipment operability, while repeatedly switching the high-energy X-ray tube on and off damages the tube and shortens the equipment's lifespan. The shutter device for radiation protection provided by this invention shields the critical areas where X-rays overflow, eliminating the need for significantly increasing the thickness and area of ​​the shielding layer or repeatedly switching the high-energy X-ray tube on and off. This reduces manufacturing and transportation costs, improves equipment operability, and extends the equipment's lifespan.

[0034] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A shutter device for radiation protection, characterized in that The system includes a shield (2), a light-emitting diode (4), a photodiode (5), a collimator (7), and a driving and logic circuit (8). The collimator (7) has a hole through which the shield (2) passes. One end of the collimator (7) has a channel for accommodating a fuel rod (6). The right end of the fuel rod (6) is positioned between the light-emitting diode (4) and the photodiode (5). The light-emitting diode (4) and the photodiode (5) are arranged on the channel. The light-emitting diode (4) is positioned above the channel, and the photodiode (5) is positioned below the channel. The photodiode (4) and the photosensitive diode (5) are electrically connected to the driving and logic circuit (8) respectively. The shield (2) is connected to the transmission device (3). The transmission device (3) is connected to the rotary electromagnet (1). The rotary electromagnet (1) is electrically connected to the driving and logic circuit (8). The rotary electromagnet (1) is a rotary electromagnet with a fixed rotation angle. The driving and logic circuit (8) detects whether the fuel rod (6) is in place, and controls the rotary electromagnet (1) to be in the conducting state when the fuel rod (6) is in place, so that the shield (2) is lifted and X-rays are emitted.

2. The shutter device for radiation protection according to claim 1, characterized in that, The shield (2) has a diameter of 10 mm and a height of 44 mm.

3. The shutter device for radiation protection according to claim 1, characterized in that, The shield (2) is cylindrical in shape.

4. The shutter device for radiation protection according to claim 1, characterized in that, The material of the shield (2) is lead.

5. The shutter device for radiation protection according to claim 1, characterized in that, The collimator (7) has a height of 88 mm and a length of 62.71 mm.

6. The shutter device for radiation protection according to claim 1, characterized in that, The depth of the hole in the collimator (7) is 34 mm.

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