Insert type irradiation experiment sample holder

Abstract

The present invention discloses a plug-in type irradiation experiment sample rack, which is characterized in that it includes a beam limiting flange arranged in the left and right directions, and a plug-in type irradiation experiment sample rack; a through hole corresponding to the proton beam transmission line is opened at the axial center of the beam limiting flange, one end of the through hole is connected to the end of the beam line, and the other end is connected to the plug-in type irradiation experiment sample rack, and the beam at the end of the beam line passes through one end of the through hole of the speed limiting flange and radiates to the plug-in type irradiation experiment sample rack at the other end of the speed limiting flange. The present invention replaces the planar movable experiment sample rack with the plug-in type irradiation experiment sample rack, and achieves unexpected results. Compared with the planar movable sample rack of the prior art, the variable time-sharing irradiation is improved to parallel irradiation, and the number of samples irradiated in parallel is maximized, which effectively saves irradiation time and greatly reduces the cost for users.

Description

Technical Field

[0001] The invention relates to the technical field of cyclotron accelerator extraction beam application, in particular to a device used for irradiating experimental samples at the end of a cyclotron accelerator extraction beam line. Background Art

[0002] The 100MeV cyclotron built by the Institute of Atomic Energy - Cyclotron Center has five beam lines, one of which is a dedicated beam line for proton irradiation, which is used to carry out irradiation experiments on military or civilian product samples to resist proton radiation.

[0003] The irradiation experiment of the prior art against proton radiation adopts a movable planar sample rack based on a limited number of samples. The samples on the planar sample rack are laid flat on the sample rack with a certain distance between the upper, lower, left and right sides. The sample rack is moved during proton irradiation so that samples at different positions on the sample rack are moved to the exit of the beam in a time-sharing manner, thereby completing the time-sharing proton irradiation experiment.

[0004] The biggest problem with the existing technology based on a limited number of time-sharing irradiation methods is that it cannot meet the needs of users to irradiate multiple samples at the same time. Since it takes a long time for each sample to reach the detection of radiation resistance, the longest irradiation time is more than 20 hours. If multiple samples are irradiated, it will take at least 2-3 days. In addition, the cost of proton irradiation is very high. The time-sharing irradiation method increases the user's test cost many times. Summary of the invention

[0005] In order to solve the problems existing in the prior art, the present invention provides an insert-type irradiation experiment sample rack, aiming to solve the problems of the prior art time-sharing irradiation method taking a long time and high cost.

[0006] In order to solve the technical problems, the present invention proposes the following technical solutions.

[0007] A plug-in type irradiation experiment sample rack is characterized in that it comprises a beam limiting flange arranged in the left and right directions and the plug-in type irradiation experiment sample rack; a through hole corresponding to a proton beam transmission line is opened at the axial center of the beam limiting flange, one end of the through hole is connected to the end of the beam line, and the other end is connected to the plug-in type irradiation experiment sample rack, and the beam at the end of the beam line passes through one end of the through hole of the speed limiting flange and radiates to the plug-in type irradiation experiment sample rack at the other end of the speed limiting flange.

[0008] The insert-type irradiation experiment sample rack has 39 slots arranged front and back along the beam line penetration direction, and can irradiate up to 39 groups of samples at the same time, and the number of sample groups can be reduced according to specific experimental requirements.

[0009] The through hole corresponding to the proton beam transmission line has a size of 40x40mm according to the requirements of the experimental user's irradiation field. At the same time, 8 through holes with a diameter of φ8.5 are evenly distributed along the central axis of the flange, which are used to fasten the beam limiting flange to the end flange of the proton beam line; at the same time, four M3 countersunk screws are opened at a position 12mm away from the lower edge of the central square hole for connection with the slot-type sample receiving frame, and the size corresponds to the reserved installation size of 22x7mm on the slot-type sample receiving frame. At the same time, two M5 threaded holes are reserved on the beam limiting flange, which can be used to connect two M5 long screws to support the slot-type sample receiving frame.

[0010] The slot-type sample receiving frame is provided with a connecting block connected to the beam-limiting flange, and the connecting block is an integral part of the insert-type irradiation experiment sample frame; the slot-type sample receiving frame is connected to the beam-limiting flange by the connecting block of the slot-type sample receiving frame, and a through hole with an installation size of 22x7mm is reserved on the connecting block. Four M3 screws are sunk into the countersunk screw holes of the beam-limiting flange and then tightened with nuts on the rear end face of the connecting block. A 40x30mm installation space is hollowed out in the middle of the connecting block as a space for tightening the nut with a wrench.

[0011] Each of the 39 slots is 3mm wide and 2mm thick. The experimental samples are usually only a few microns thick. During the experiment, the samples with a thickness of only a few microns are attached to an aluminum plate with a thickness of 0.3mm, and then the aluminum plate with the samples is inserted into the slot of the slot-type sample receiving frame.

[0012] The slot-type sample receiving rack is made by 3D printing, and the printing material is photosensitive resin.

[0013] Advantages and effects of the present invention

[0014] 1. The present invention replaces the planar movable experimental sample rack with a plug-in type irradiation experimental sample rack, and achieves unexpected results. Specifically, the beam limiting flange is fastened to the end flange of the proton beam line, the plug-in type irradiation experimental sample rack is integrated with the connection block, the beam limiting flange is connected to the plug-in type irradiation experimental sample rack through the connection block, and the slot type experimental sample rack is provided with a plug-in area and an irradiation area, and the irradiation area is aligned with the area irradiated by the beam channel. Through the above structure, the planar movable experimental sample rack is replaced by the plug-in type experimental sample rack arranged front and back, and then the range of protons in aluminum is calculated, and finally the maximum number of plugs that can be irradiated simultaneously by the plug-in type irradiation experimental sample rack is calculated. Compared with the planar movable sample rack in the prior art, the variable time-sharing irradiation is improved to parallel irradiation, and the number of samples irradiated in parallel is maximized, which effectively saves irradiation time and greatly reduces the cost of users.

[0015] 2. The present invention skillfully combines the insert-type irradiation experiment sample rack and nuclear physics calculation technology: the design of the number of slots in the insert-type irradiation experiment sample rack is inseparable from the nuclear physics calculation technology, and the nuclear physics calculation technology relies on the structure of the insert-type irradiation experiment sample rack to function. The two support and depend on each other. The combined effect is much better than that of each of them before the combination, and has outstanding substantive characteristics and significant progress.

[0016] 3. The slot-type sample receiving frame of the present invention is made by 3D printing, and the printing material is photosensitive resin. The entire processing process only takes more than 2 hours. Compared with the method of cutting aluminum materials by mechanical cutting means, the processing time is greatly shortened. At the same time, low-cost photosensitive resin materials are used instead of aluminum materials, and the material cost is also greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the front view of the insert type irradiation experiment sample rack;

[0018] Figure 2 This is a three-dimensional image of the insert-type irradiation experiment sample rack;

[0019] Figure 3 It is a schematic diagram of the end face structure of the beam-limiting flange;

[0020] Figure 4 Schematic diagram of the effective irradiation area of ​​the sample holder cross section.

[0021] In the figure, 1: beam-limiting flange; 1-1: 40*40 beam-limiting hole; 1-2: 4 M3 screws; 1-3: 8 M8 mounting holes; 1-4: 2 reserved M5 holes; 2: insert-type irradiation experiment sample holder; 2-1: sample insert; 2-1-1: upper end face of sample insert; 2-1-2: lower end face of sample insert; 2-2: effective irradiation area. DETAILED DESCRIPTION

[0022] The present invention will be further explained below in conjunction with the accompanying drawings:

[0023] Principle of the Invention

[0024] Element replacement invention design principle. The present invention replaces the flat-type irradiation experiment sample rack with an insert-type irradiation experiment sample rack. The flat-type irradiation experiment sample rack can only irradiate one sample at a time. When one sample is completed and the next sample is continued to be irradiated, the position of the experiment sample rack needs to be moved. When the position needs to be moved horizontally, the experiment sample rack needs to move back and forth on the guide rail. When it needs to move vertically, the experiment sample rack needs to be lifted to a predetermined height by a lifting device. Regardless of whether it moves horizontally or vertically, this flat-type experiment sample rack can only irradiate one sample at a time. Since the sample irradiation time each time needs to be relatively long to test the radiation resistance effect, and the cost of this single irradiation is expensive, it cannot meet the needs of users.

[0025] The present invention uses a slot-type experimental sample rack to replace a flat-type experimental sample rack. By taking advantage of the property that a proton beam can penetrate a substance, the sample flattened on the sample rack is improved to be arranged in a sample slot extending along the beam line in a front-to-back centering arrangement. The maximum length of the sample slot is the maximum length of the allowable range of the attenuation degree of the proton beam penetrating the sample. The maximum safe length = (0.3 mm aluminum plate thickness + several microns sample thickness) * 39. The range of a 100 MeV proton in aluminum is 36. 79mm, the total thickness of the 39 sets of sample insert aluminum plates is (0.3x39=11.7mm), and the range of 80MeV protons in aluminum is 24.80mm (using nuclear physics calculation software, when the energy is 80MeV, the range of protons in aluminum is 24.80mm), so the energy of 100MeV protons drops to about 80MeV after passing through the 11.7mm thick aluminum plate, and the energy range of 80MeV-100MeV is the experimental beam energy range required by experimental users. Therefore, within this range of 39 sets of samples, although the radiation intensity of the proton beam decays with the increase of distance, the decay is within the allowable safety range.

[0026] Based on the above invention principle, the present invention provides an insert-type irradiation experiment sample rack.

[0027] A plug-in type irradiation experiment sample holder Figure 1 As shown, its characteristics are: it includes a beam limiting flange 1 arranged in the left and right directions, and an insert-type irradiation experiment sample holder 2; a through hole 1-1 corresponding to the proton beam transmission line is opened at the axial center of the beam limiting flange 1, one end of the through hole 1-1 is connected to the end of the beam line, and the other end is connected to the insert-type irradiation experiment sample holder 2, and the beam at the end of the beam line passes through one end of the speed limiting flange through hole 1-1 and radiates to the insert-type irradiation experiment sample holder 2 at the other end of the speed limiting flange 1.

[0028] The insert-type irradiation experiment sample rack 2 has 39 slots arranged front and back along the beam line penetration direction, and can irradiate up to 39 groups of samples at the same time, and the number of sample groups can be reduced according to specific experimental requirements.

[0029] The through hole 1-1 on the beam limiting flange 1 corresponding to the proton beam transmission line has a size of 40x40mm according to the requirements of the experimental user's irradiation field. At the same time, 8 through holes 1-3 with a diameter of φ8.5 are evenly distributed along the central axis of the beam limiting flange, which are used to fasten the beam limiting flange 1 to the end flange of the proton beam line; at the same time, four M3 countersunk screws 1-2 are opened at a position 12mm away from the lower edge of the central square hole for connection with the slot-type sample receiving frame 2, and the size corresponds to the reserved installation size of 22x7mm on the slot-type sample receiving frame 2. At the same time, two M5 threaded holes 1-4 are reserved on the beam limiting flange 1, which can be used to connect two M5 long screws to support the slot-type sample receiving frame 2.

[0030] The slot-type sample receiving frame 2 is provided with a connecting block connected to the beam limiting flange 1, and the connecting block and the insert-type irradiation experiment sample frame are an integral whole; the slot-type sample receiving frame 2 is connected to the beam limiting flange 1 by the connecting block of the slot-type sample receiving frame, and a through hole with an installation size of 22x7mm is reserved on the connecting block. Four M3 screws are sunk into the countersunk screw holes 1-2 of the beam limiting flange, and then tightened with nuts on the rear end face of the connecting block. A 40x30mm installation space is hollowed out in the middle of the connecting block as a space for tightening the nut with a wrench.

[0031] Each of the 39 slots is 3mm wide and 2mm thick. The experimental samples are usually only a few microns thick. During the experiment, the samples with a thickness of only a few microns are attached to an aluminum plate with a thickness of 0.3mm, and then the aluminum plate with the samples is inserted into the slot of the slot-type sample receiving frame.

[0032] The slot-type sample receiving rack is made by 3D printing, and the printing material is photosensitive resin.

[0033] Embodiment 1

[0034] The proton irradiation device is installed at the end of the isotope production line of the 100Mev cyclotron north beam line. The proton irradiation device is fixed to the end of the beam line by 8 M8 screws. Four M3 screws are inserted from the front end of the beam limiting flange, and then four nuts are screwed on with a wrench from the installation space of the connection block of the slot-type sample receiving frame. Then two M5 long screws are installed at the two M5 threads of the beam limiting flange. The nuts of the long screws just touch the lower end surface of the slot-type sample receiving frame to play a supporting role. The size of the experimental samples is small, usually only a few um, so during the experiment, the samples that require the same dose are pasted on a 0.3mm thick aluminum plate and inserted into the slot. The spacing between each aluminum plate is 5mm. During the experiment, a large number of chip samples are pasted on the aluminum plate in advance and placed in the slot according to the required dose. The samples with a large dose are placed at the rear end of the slot, and the samples with a small dose are placed at the front end of the slot near the end of the beam line. At the beginning of the experiment, all samples were inserted into the slots. Some samples required 3600s of irradiation time. After 3600s of irradiation, the front samples were taken out and the rear samples were irradiated. The rear samples were irradiated for 3600s, and the total irradiation time reached 7200s. In actual work, the samples of a slot sample rack are divided according to the number of irradiation hours. The samples with 1 digit of hours are placed on a slot sample test rack, the samples with 2 digits of hours are placed on a slot sample test rack, and the samples with 3 digits (hundreds of irradiation hours) are placed on a slot sample test rack. In this way, the effect of installing one sample rack and irradiating multiple groups of experimental samples is achieved. At the same time, the irradiation experiment slot sample rack innovatively adopts 3D printing technology, which makes it faster and more flexible, and produces non-standard customized slot sample receiving racks at a lower cost. The printing material is photosensitive resin. After testing, it is found that the strength and rigidity of the slot sample receiving rack meet the use requirements. Because the beam of the 100MeV cyclotron currently has multiple potential experimental users, and different users have different experimental needs, it is necessary to design, test and process a variety of sample racks according to the experimental needs. Therefore, the processing of the sample racks uses 3D printing technology, which speeds up the progress of R&D and production, shortens the time of experimental testing, and provides favorable assistance for faster and better development of irradiation experiments.

[0035] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A plug-in type irradiation experiment sample holder, characterized in that: it comprises a beam limiting flange arranged in the left and right directions, and a plug-in type irradiation experiment sample holder; a through hole corresponding to the proton beam transmission line is opened at the axial center of the beam limiting flange, one end of the through hole is connected to the end of the beam line, and the other end is connected to the plug-in type irradiation experiment sample holder, and the beam at the end of the beam line passes through one end of the through hole of the speed limiting flange and radiates to the plug-in type irradiation experiment sample holder at the other end of the speed limiting flange; The maximum length of the sample slot is the maximum length of the allowable range of proton beam transmission sample attenuation, which is 80MeV-100MeV energy range; the maximum safe length = (0.3mm aluminum plate thickness + several microns sample thickness) * 39; 39 slots are set, each slot is 3mm wide, the wall thickness of the slot is 2mm, and the experimental sample is several microns. During the experiment, the sample with a thickness of several microns is attached to an aluminum plate with a thickness of 0.3 mm, and then the aluminum plate with the sample is inserted into the slot of the slot-type sample receiving frame; The insert-type irradiation experiment sample rack has 39 slots arranged front and back along the beam line penetration direction, and can irradiate up to 39 groups of samples at the same time, and the number of sample groups can also be reduced according to specific experimental requirements.

2. The insert type irradiation experiment sample holder according to claim 1, characterized in that: The through hole corresponding to the proton beam transmission line has a size of 40x40mm according to the requirements of the experimental user's irradiation field. At the same time, 8 through holes with a diameter of φ8.5 are evenly distributed along the central axis of the flange, which are used to fasten the beam limiting flange to the end flange of the proton beam line; at the same time, four M3 countersunk screws are opened at a position 12mm away from the lower edge of the central square hole for connection with the slot-type sample receiving frame, and the size corresponds to the reserved installation size of 22x7mm on the slot-type sample receiving frame. At the same time, two M5 threaded holes are reserved on the beam limiting flange for connecting two M5 long screws to support the slot-type sample receiving frame.

3. The insert type irradiation experiment sample holder according to claim 1, characterized in that: The slot-type sample receiving frame is provided with a connecting block connected to the beam-limiting flange, and the connecting block is an integral part of the insert-type irradiation experiment sample frame; the slot-type sample receiving frame is connected to the beam-limiting flange by the connecting block of the slot-type sample receiving frame, and a through hole with an installation size of 22x7mm is reserved on the connecting block. Four M3 screws are sunk into the countersunk screw holes of the beam-limiting flange and then tightened with nuts on the rear end face of the connecting block. A 40x30mm installation space is hollowed out in the middle of the connecting block as a space for tightening the nut with a wrench.

4. The insert type irradiation experiment sample holder according to claim 1, characterized in that: The slot-type sample receiving rack is made by 3D printing, and the printing material is photosensitive resin.

Images