Preparation method and measurement method of radioactive source interlayer

Abstract

The invention relates to the technical field of radioactive sources, and provides a preparation method and a measurement method of a radioactive source interlayer, the radioactive source interlayer is used for a magnetic calorimeter, and the preparation method comprises the following steps: arranging a radioactive crystal in an absorber to form a radioactive interlayer; and pressurizing and heating the radioactive interlayer to form the radioactive source interlayer. According to the preparation method and the measurement method of the radioactive source interlayer provided by the invention, the absorption efficiency of the absorber can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of radioactive sources, and in particular to a preparation method and a measurement method of a radioactive source interlayer. Background Art

[0002] A magnetic calorimeter is a low-temperature particle detector based on calorimetry, and is usually operated at extremely low temperatures below 100 mK. In related technologies, when a magnetic calorimeter is used for measurement, the absorber has a low absorption efficiency for the radiation emitted by the radiation source. Summary of the invention

[0003] In view of this, the embodiments of the present application hope to provide a method for preparing and measuring a radioactive source interlayer, which can improve the absorption efficiency of an absorber.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the embodiment of the present application is implemented as follows:

[0005] The present application discloses, on one hand, a method for preparing a radioactive source interlayer, wherein the radioactive source interlayer is used for a magnetic calorimeter, comprising:

[0006] Placing radioactive crystals within the absorber to form a radioactive interlayer;

[0007] The radioactive sandwich is pressurized and heated to form the radiation source sandwich.

[0008] In one embodiment, the preparation method includes: using a hydraulic device to pressurize the radioactive interlayer, wherein the hydraulic device includes a base, a hydraulic telescopic rod and a pressurizing part, the hydraulic telescopic rod is telescopically arranged between the base and the pressurizing part, the radioactive interlayer is placed on the base, and the hydraulic telescopic rod is configured to drive the pressurizing part to squeeze the radioactive interlayer.

[0009] In one embodiment, the radioactive interlayer is subjected to 1.5N / mm 2 of pressurization.

[0010] In one embodiment, a heating module is disposed on the base, and the heating module is used to heat the radioactive interlayer.

[0011] In one embodiment, the heating temperature is between 300°C and 400°C.

[0012] In one embodiment, the preparation method includes: a gasket is provided at least between the base and the radioactive interlayer and between the pressurizing part and the radioactive interlayer.

[0013] In one embodiment, the absorber includes an upper absorber and a lower absorber; and the step of placing the radioactive crystals in the absorber to form a radioactive interlayer includes:

[0014] preparing a radioactive solution and dropping it onto the lower absorber;

[0015] After the radioactive solution is dried to become the radioactive crystals, the upper absorbent is covered and the peripheries of the upper absorbent and the lower absorbent are pressed together to form the radioactive interlayer.

[0016] In one embodiment, the radioactive interlayer is pressurized and heated for 3 hours.

[0017] In one embodiment, the absorber is gold foil.

[0018] Another aspect of the present application discloses a measurement method, including the preparation method in any one of the above embodiments, wherein the measurement method includes:

[0019] Bonding the radioactive source interlayer to the external bonding point of the paramagnetic body, and converting the temperature change generated by the absorber when absorbing the radiation emitted by the radioactive crystal into a magnetic flux signal through a metal paramagnetic temperature sensor;

[0020] The magnetic flux signal is measured by a superconducting quantum interference device to obtain the signal and energy spectrum of the radioactive crystal.

[0021] The embodiment of the present application discloses a method for preparing and measuring a radioactive source interlayer, wherein a radioactive crystal is first disposed in an absorber to form a radioactive interlayer, and then the radioactive interlayer is heated to form a radioactive source interlayer. Thus, by disposing the radioactive crystal in the radioactive body and then heating and pressurizing the radioactive crystal, the radioactive source and the absorber can be kneaded into one. Here, most of the rays emitted by the radioactive crystal to the surroundings can be absorbed by the absorber wrapped outside thereof, thereby reducing the possibility of the rays emitted by the radioactive crystal being emitted from the gap between the radioactive crystal and the absorber. Thus, the absorption efficiency of the radioactive source can be greatly improved, and the possibility of 4π absorption can be achieved. Thus, on the one hand, the possibility of radiation leakage into the environment can be reduced, thereby protecting the life safety of the operator; on the other hand, the reliability and accuracy of the subsequent measurement of the signal and energy spectrum of the radioactive source can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A schematic diagram of a process for preparing a radioactive source interlayer provided in an embodiment of the present application;

[0023] Figure 2 A schematic diagram of the structure of a radioactive source interlayer, a hydraulic device and a gasket provided in another embodiment of the present application;

[0024] Figure 3A flow chart of a measurement method provided in another embodiment of the present application.

[0025] Description of Reference Numerals

[0026] 100. Radioactive source interlayer; 1. Radioactive crystal; 2. Absorber; 21. Upper absorber; 22. Lower absorber; 200. Hydraulic device; 201. Base; 202. Hydraulic telescopic rod; 203. Pressurizing part; 204. Heating module; A. Gasket. DETAILED DESCRIPTION

[0027] It should be noted that, in the absence of conflict, the embodiments and technical features in the embodiments of the present application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of the present application and should not be regarded as an improper limitation on the present application.

[0028] The present application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] The present application provides a method for preparing a radioactive source interlayer 100. The radioactive source interlayer 100 is used in a magnetic calorimeter (MMC). Figure 1 and Figure 2 , the preparation method comprises:

[0030] S1. placing radioactive crystals in the absorber to form a radioactive interlayer;

[0031] S2. Pressurizing and heating the radioactive interlayer to form the radiation source interlayer.

[0032] The preparation method of the radioactive source interlayer 100 provided in the present application is to first set the radioactive crystal 1 in the absorber 2 to form a radioactive interlayer, and then heat and heat the radioactive interlayer to form the radioactive source interlayer 100. In this way, by setting the radioactive crystal 1 in the radioactive body and then adopting the method of heating and pressurizing, the radioactive source and the absorber 2 can be kneaded into one. Here, most of the rays emitted by the radioactive crystal 1 to the surroundings can be absorbed by the absorber 2 wrapped outside it, reducing the situation where the rays emitted by the radioactive crystal 1 are emitted from the gap between the radioactive crystal 1 and the absorber 2. In this way, the absorption efficiency of the rays emitted by the radioactive crystal 1 can be greatly improved, and the possibility of 4π absorption can be achieved. In this way, on the one hand, the possibility of radiation leakage into the environment can be reduced, thereby protecting the life safety of the operator; on the other hand, the reliability and accuracy of the subsequent measurement of the signal and energy spectrum of the radioactive crystal 1 can be improved.

[0033] It should be noted that 4π absorption means that the absorber 2 can capture all the rays emitted by the radioactive crystal 1 in all directions, that is, within the entire 4π solid angle range.

[0034] In one embodiment, please refer to Figure 2 The preparation method includes: using a hydraulic device 200 to pressurize the radioactive interlayer, wherein the hydraulic device 200 includes a base 201, a hydraulic telescopic rod 202 and a pressurizing part 203, the hydraulic telescopic rod 202 is telescopically arranged between the base 201 and the pressurizing part 203, the radioactive interlayer is placed on the base 201, and the hydraulic telescopic rod 202 is configured to drive the pressurizing part 203 to squeeze the radioactive interlayer.

[0035] Exemplarily, the hydraulic telescopic rod 202 includes a cylinder and a telescopic rod, the telescopic rod is located in the cylinder, the telescopic rod can be connected to the pressurizing part 203, and the cylinder can be connected to the base 201. In this way, when it is necessary to pressurize the radioactive interlayer, the radioactive interlayer can be placed in the center of the base 201 first, and the hydraulic telescopic rod 202 can be driven to retract the telescopic rod into the cylinder, and then the pressurizing part 203 can be driven to approach the base 201 to squeeze the radioactive interlayer, so that the absorbent 2 and the radioactive crystal 1 are squeezed into one body, so as to improve the absorption efficiency of the radioactive crystal 1.

[0036] In one embodiment, the radioactive interlayer is subjected to 1.5N / mm 2 That is, the radioactive interlayer can be squeezed at 1.5 MPa. For example, the radioactive interlayer can be squeezed at 1.5 N / mm by using the hydraulic device 200. 2 Thus, by setting a suitable pressurization value, not only can the absorber 2 and the radioactive crystal 1 be squeezed into one, but also the situation where the radioactive source interlayer 100 is broken and the radioactive crystal 1 is exposed to the outside can be reduced.

[0037] In one embodiment, please refer to Figure 2 A heating module 204 is disposed on the base 201, and the heating module 204 is used to heat the radioactive interlayer.

[0038] Exemplarily, the heating module 204 may be disposed in the middle of the base 201, so that the radioactive interlayer may be heated while applying pressure. In other embodiments, the heating process may not apply pressure, and the pressurization process may not apply heating.

[0039] By arranging the heating module 204 to heat the radioactive interlayer, the radioactive crystal 1 can be better filled into the absorber 2 to form a whole, thereby improving the absorption efficiency of the rays emitted by the radioactive crystal 1.

[0040] In one embodiment, the heating temperature is between 300° C. and 400° C. Exemplarily, the heating temperature may be 300° C., 310° C., 320° C., 330° C., 340° C., 350° C., 360° C., 370° C., 380° C., 390° C. or 400° C., etc. Here, by setting a suitable heating temperature, the radioactive leaching can be better filled into the absorber 2 to make it integral, reduce the occurrence of radiation emitted by the radioactive crystal 1 emitting from the gap between the radioactive crystal 1 and the absorber 2, and improve the absorption efficiency of the radiation emitted by the radioactive crystal 1.

[0041] In one embodiment, please refer to Figure 2 The preparation method includes: a gasket A is provided at least between the base 201 and the radioactive interlayer and between the pressurizing part 203 and the radioactive interlayer.

[0042] Exemplarily, a gasket A may be placed between the base 201 and the radioactive interlayer, between the pressurizing portion 203 and the radioactive interlayer, or both between the base 201 and the radioactive interlayer and between the pressurizing portion 203 and the radioactive interlayer.

[0043] Thus, by providing the gasket A, the situation where the absorber 2 is attached to the pressurizing part 203 and / or the base 201 after subsequent pressurization and heating can be reduced, making it easier to take the radiation source sandwich 100 .

[0044] In one embodiment, please refer to Figure 2 The absorber 2 includes an upper absorber 21 and a lower absorber 22. S1, a step of placing the radioactive crystal 1 in the absorber 2 to form a radioactive interlayer, comprising:

[0045] S11, preparing a radioactive solution and dropping it on the lower absorber;

[0046] S12, after the radioactive solution is dried to become the radioactive crystals, the upper absorbent is covered and the peripheries of the upper absorbent and the lower absorbent are pressed together to form the radioactive interlayer.

[0047] Exemplarily, the radioactive solution to be measured can be prepared, and then the prepared radioactive solution can be dripped onto the lower absorber 22. After the radioactive solution is dried into radioactive crystals 1, the upper absorber 21 is covered, and finally the periphery of the upper absorber 21 and the lower absorber 22 are pressed together. Here, by covering the upper absorber 21 after the radioactive solution is dried into radioactive crystals 1, the outflow of radioactive substances during subsequent pressurization can be reduced, and the reliability and stability of subsequent measurement data can be improved. By pressing the periphery of the upper absorber 21 and the lower absorber 22 together, the formation of a gap between the lower absorber 22 and the upper absorber 21 can be reduced. In this way, the situation where the rays emitted by the radioactive crystals 1 can be emitted from the gap can be reduced, and the absorption efficiency of the absorber 2 on the rays emitted by the radioactive crystals 1 can be improved.

[0048] Exemplarily, in one embodiment, the radioactive solution can be dropped onto the lower absorber 22 by a micro-droplet device, so that the size and quantity of the droplets can be controlled.

[0049] Exemplarily, in one embodiment, the tension radius of the radioactive solution on the lower absorbent body 22 is no greater than half of the width or length of the lower absorbent body 22 .

[0050] In one embodiment, the radioactive sandwich is pressurized and heated for 3 hours.

[0051] In this way, when the radioactive interlayer is pressurized and heated, the heating temperature and pressurization value can be maintained for 3 hours. In this way, the absorber 2 and the radioactive crystal 1 can be further squeezed into one, reducing the occurrence of cracking of the absorber 2 and separation of the absorber 2 and the radioactive crystal 1 during subsequent measurement and storage, thereby improving the absorption efficiency of the absorber 2 for the rays emitted by the radioactive crystal 1.

[0052] Illustratively, in one embodiment, the radioactive crystal 1 may emit alpha particle rays.

[0053] In one embodiment, the absorber 2 is a gold foil. That is, the radioactive impregnation can be wrapped together with gold foil and then pressurized and heated. On the one hand, gold is a metal with very stable chemical properties, which is not easy to react with other positions and has good working stability; on the other hand, the density of gold is relatively high, which means that in the same volume, the mass of gold is larger, and more atomic nuclei can be provided to absorb the rays emitted by the radioactive crystal 1, thereby improving the absorption efficiency; on the other hand, gold has excellent thermal conductivity, and can conduct the temperature change after absorbing the rays emitted by the radioactive crystal 1, which is convenient for subsequent measurement using calorimetry.

[0054] In one embodiment, the area of ​​the gold foil is 1 mm 2For example, the gold foil may be a square with a side length of 1 mm. Here, by setting a gold foil of a suitable size, the small-sized radioactive crystal 1 can be wrapped and absorbed.

[0055] Another aspect of the present application embodiment provides a measurement method. Figure 3 , including the preparation method in any one of the above embodiments, the measuring method includes:

[0056] S3, bonding the radioactive source interlayer to the external bonding point of the paramagnet, and converting the temperature change generated by the absorber when absorbing the rays emitted by the radioactive crystal into a magnetic flux signal through a metal paramagnetic temperature sensor;

[0057] S4. Measuring the magnetic flux signal by a superconducting quantum interference device to obtain the signal and energy spectrum of the radioactive crystal.

[0058] It can be understood that a superconducting quantum interference device (SQUID) is a magnetic field device that can utilize the superconducting macroscopic quantum interference effect and can accurately measure the relative changes in the magnetic field.

[0059] Here, a metal paramagnetic temperature sensor is used to convert the temperature change of the absorber 2 into a magnetic flux signal, and then the magnetic flux signal is measured by a superconducting quantum interference device to obtain the signal and energy spectrum of the radiation source. Based on the advantages of the preparation method of the radiation source interlayer 100 provided in the present application, the absorber 2 has a high absorption efficiency for the emission rays of the radioactive crystal 1, which makes the measurement of the radioactive crystal 1 reliable and accurate.

[0060] For example, in one embodiment, the minimum detection threshold of the superconducting quantum interference device can detect 10 -15 T magnetic field changes.

[0061] Exemplarily, in one embodiment, when it is necessary to measure the radioactive material, its radioactive solution can be prepared first, and then the radioactive solution can be dripped on the lower absorber 22 and allowed to dry into a radioactive crystal 1, and then the upper absorber 21 is covered and the periphery of the upper absorber 21 and the lower absorber 22 are pressed together, and then placed on the heating module 204 in the base 201, and then the hydraulic telescopic rod 202 is operated to move the pressurizing part 203 toward the base 201 to apply a set pressure to the radioactive interlayer, and the heating module 204 is started to heat the radioactive interlayer to a set temperature, and maintain the set temperature and set pressure for a set time, and finally the absorber 2 is bonded to the external bonding point of the paramagnet, and then the temperature change generated by the absorber 2 when absorbing the rays emitted by the radioactive crystal 1 is converted into a magnetic flux signal through a metal paramagnetic temperature sensor, and finally the magnetic flux signal is measured through a superconducting quantum interference device to obtain the signal and energy spectrum of the radioactive crystal 1.

[0062] Exemplarily, in one embodiment, before preparing the radioactive source interlayer 100, it is necessary to prepare a gold foil (absorber 2) of a set size and thickness, and a radioactive solution with determined parameters. Subsequently, the radioactive solution is dripped onto a layer of gold foil through a micro-droplet device, and the total amount of the droplets is controlled to make the tension radius as small as possible; after the radioactive solution is dried into a radioactive crystal 1, another layer of gold foil is covered, and the periphery of the two layers of gold foil are pressed together, and then transferred to the middle of the base 201 of the hydraulic device 200 through a gasket A, and a gasket A is also placed on the other layer of gold foil; the hydraulic switch is turned on to drive the hydraulic telescopic rod 202, the pressurizing part 203 is pressed down by its own weight, and the heating module 204 is turned on to heat the radioactive interlayer; after the temperature is raised to between 300°C and 400°C, the pressurizing part 203 is pressed down on the base 201 through the hydraulic device 200 to generate 1.5N / mm 2 and keep the temperature and pressure for about 3 hours; after 3 hours, turn off the heating module 204 and cool naturally; slowly reduce the applied pressure and lift the pressurizing part 203, take out the two gaskets A and the middle radioactive source interlayer 100; bond the absorber 2 to the external bonding point of the paramagnet by wire bonding, carry out the magnetic calorimeter experiment, and finally read out the signal and energy spectrum of the radioactive substance.

[0063] The above is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. All modifications, equivalent substitutions, improvements, etc. within the spirit and principles of the present application are included in the protection scope of the present application.

Claims

1. A method for preparing a radioactive source interlayer, characterized in that: The radioactive source interlayer is used for a magnetic calorimeter, and the preparation method comprises: Placing radioactive crystals within the absorber to form a radioactive interlayer; The radioactive sandwich is pressurized and heated to form the radiation source sandwich.

2. The preparation method according to claim 1, characterized in that: The preparation method includes: using a hydraulic device to pressurize the radioactive interlayer, wherein the hydraulic device includes a base, a hydraulic telescopic rod and a pressurizing part, the hydraulic telescopic rod is telescopically arranged between the base and the pressurizing part, the radioactive interlayer is placed on the base, and the hydraulic telescopic rod is configured to drive the pressurizing part to squeeze the radioactive interlayer.

3. The preparation method according to claim 1 or 2, characterized in that: The radioactive sandwich was subjected to 1.5 N / mm 2 of pressurization.

4. The preparation method according to claim 2, characterized in that: A heating module is arranged on the base, and the heating module is used to heat the radioactive interlayer.

5. The preparation method according to claim 1 or 4, characterized in that: The heating temperature is between 300°C and 400°C.

6. The preparation method according to claim 2, characterized in that: The preparation method comprises: a gasket is provided at least between the base and the radioactive interlayer and between the pressurizing part and the radioactive interlayer.

7. The preparation method according to claim 1, characterized in that: The absorber comprises an upper absorber and a lower absorber; and the step of placing radioactive crystals in the absorber to form a radioactive interlayer comprises: preparing a radioactive solution and dropping it onto the lower absorber; After the radioactive solution is dried to become the radioactive crystals, the upper absorbent is covered and the peripheries of the upper absorbent and the lower absorbent are pressed together to form the radioactive interlayer.

8. The preparation method according to claim 1, characterized in that: The radioactive sandwich was pressurized and heated for 3 h.

9. The preparation method according to claim 1, characterized in that: The absorber is gold foil.

10. A measurement method, characterized in that: The method comprises the preparation method according to any one of claims 1 to 9, wherein the measuring method comprises: Bonding the radioactive source interlayer to the external bonding point of the paramagnetic body, and converting the temperature change generated by the absorber when absorbing the radiation emitted by the radioactive crystal into a magnetic flux signal through a metal paramagnetic temperature sensor; The magnetic flux signal is measured by a superconducting quantum interference device to obtain the signal and energy spectrum of the radioactive crystal.

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