Ray Nal scintillation counter

Abstract

The utility model discloses a ray Nal scintillation counter, which comprises a photomultiplier, one end of the photomultiplier is provided with a sealed aluminum shell, one end in the photomultiplier is provided with a divider resistor, one end of the divider resistor is provided with a follower, and one end of the follower far away from the divider resistor is provided with a display instrument. The beneficial effects are that the two electromagnetic elements with different magnetic poles are connected to form a couple pair, after electrification, energy transfer is generated, the heating plate and the cold end plate which are connected with the two electromagnetic elements are enabled to heat and refrigerate respectively, the effect of maintaining the temperature of the sealed aluminum shell within a certain range is further achieved by adjusting the voltage of the power supply, and the service life of the sealed aluminum shell is prolonged. The situation that the Nal crystal has large decay time constant change is avoided, the effect of improving the measurement precision of the scintillation counter is achieved, and the effects of heating of the cold end plate and refrigeration of the heating plate are achieved by changing the direction of the current.

Description

Technical Field

[0001] The utility model relates to the technical field of scintillation technology devices, in particular to a ray Nal scintillation counter. Background Art

[0002] Since Nal crystal has a long decay time constant, it will cause ballistic loss in the forming circuit, resulting in inaccurate signal amplitude obtained by the multi-channel amplitude analyzer. If the temperature rises, the decay time constant of Nal crystal will slowly decrease. It decreases to 100ns at around 180℃. If the temperature drops, the decay time constant will increase at an average rate close to 5ns / ℃, which is about 600ns at -25℃. The large range of decay time constant changes will cause a large spectrum drift in the energy spectrum measured by the scintillation counter, resulting in inaccurate measurement data, and even serious faults such as spectrum drift misalignment and measurement data errors in the energy spectrum measurement system of the scintillation counter, which greatly reduces the reliability of the scintillation counter.

[0003] In the prior art, Nal crystals are usually sealed and preserved by aluminum films when used in scintillation counters. However, since aluminum has good thermal conductivity, the decay time constant of the Nal crystal inside the scintillation counter will change, resulting in large differences in the measurement data of the scintillation counter at different temperatures, which greatly reduces the reliability of the scintillation counter.

[0004] Currently, no effective solution has been proposed for the problems in the related technologies. Utility Model Content

[0005] In view of the problems in the related art, the utility model proposes a ray Nal scintillation counter to overcome the above technical problems existing in the existing related art.

[0006] To this end, the specific technical solutions adopted by the utility model are as follows:

[0007] A ray Nal scintillation counter comprises a photomultiplier tube, one end of the photomultiplier tube is provided with a sealed aluminum shell, one end of the interior of the photomultiplier tube is provided with a voltage-dividing resistor, one end of the voltage-dividing resistor is provided with a follower, one end of the follower away from the voltage-dividing resistor is provided with a display instrument, and the upper end of the photomultiplier tube is provided with a temperature-changing device.

[0008] Furthermore, a conductive block penetrating the photomultiplier tube is disposed at the bottom of the voltage-dividing resistor, and a power supply connected to the conductive block is disposed at the lower end of the photomultiplier tube.

[0009] Furthermore, one end of the photomultiplier tube is provided with a mounting groove matched with the sealed aluminum shell, and the lower end of the sealed aluminum shell is provided with a connector connected to the power supply.

[0010] Further, the temperature-changing device includes a heating plate located at the upper end of the sealed aluminum shell. The heating plate is connected to the connector, and electromagnetic elements are symmetrically arranged at the upper end of the heating plate, and the electrodes of the two electromagnetic elements are opposite.

[0011] Further, a cold end plate is jointly arranged at the upper ends of the two electromagnetic elements, and a connecting piece in contact with the display instrument is arranged at one end of the bottom of the cold end plate.

[0012] Further, a Nal crystal is arranged inside the sealed aluminum shell.

[0013] The utility model provides a ray Nal scintillation counter, and the beneficial effects are as follows: By connecting two electromagnetic elements with different magnetic poles into an electric couple pair, after being powered on, energy transfer occurs, achieving the effects of heating the heating plate and cooling the cold end plate connected to the two electromagnetic elements respectively. Furthermore, by adjusting the voltage of the power supply, the temperature of the sealed aluminum shell is maintained within a certain range, preventing the Nal crystal from having a large change in the decay time constant, and thus achieving the effect of improving the measurement accuracy of the scintillation counter. And the effect of heating the cold end plate and cooling the heating plate can be achieved by changing the direction of the current. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0015] Figure 1 is a schematic structural diagram of a ray Nal scintillation counter according to an embodiment of the present utility model;

[0016] Figure 2 is a schematic internal structural diagram of a ray Nal scintillation counter according to an embodiment of the present utility model;

[0017] Figure 3 is a schematic structural diagram of a photomultiplier tube of a ray Nal scintillation counter according to an embodiment of the present utility model.

[0018] In the figure:

[0019] 1. Photomultiplier tube; 2. Sealed aluminum shell; 3. Voltage-dividing resistor; 4. Follower; 5. Display instrument; 6. Temperature-changing device; 7. Conductive block; 8. Power supply; 9. Installation groove; 10. Connector; 11. Heating plate; 12. Electromagnetic element; 13. Cold end plate; 14. Connector; 15. Nal crystal. Specific embodiments

[0020] To further illustrate the embodiments, the present invention provides drawings, which are part of the disclosure of the present invention. They are mainly used to illustrate the embodiments and can be combined with the relevant descriptions in the specification to explain the operating principle of the embodiments. With reference to these contents, those of ordinary skill in the art should be able to understand other possible implementation manners and the advantages of the present invention. The components in the drawings are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0021] According to an embodiment of the present invention, a ray Nal scintillation counter is provided.

[0022] Embodiment 1:

[0023] As Figures 1-3 shown, the ray Nal scintillation counter according to an embodiment of the present invention includes a photomultiplier tube 1. One end of the photomultiplier tube 1 is provided with a sealed aluminum shell 2. One end inside the photomultiplier tube 1 is provided with a voltage-dividing resistor 3. One end of the voltage-dividing resistor 3 is provided with a follower 4. The end of the follower 4 away from the voltage-dividing resistor 3 is provided with a display instrument 5. A temperature-changing device 6 is provided above the photomultiplier tube 1.

[0024] When in use, the sealed aluminum shell 2, the voltage-dividing resistor 3, the follower 4, and the display instrument 5 are combined into a scintillation counter through the setting of the photomultiplier tube 1. Through the setting of the temperature-changing device 6, when the device is in use, the sealed aluminum shell 2 part is heated, and the display instrument 5, the follower 4, and the voltage-dividing resistor 3 parts are cooled, so as to make the sealed aluminum shell 2 have a certain temperature in an environment of different temperatures, and further make the decay time constant of the Nal crystal 15 inside the sealed aluminum shell 2 be within a certain range, avoiding large decay changes of the Nal crystal 15, and further achieving the effect of improving the data stability of the scintillation counter and improving the reliability of the scintillation counter.

[0025] Embodiment 2:

[0026] As Figures 1-3As shown, a conductive block 7 penetrating through the photomultiplier tube 1 is provided at the bottom of the voltage-dividing resistor 3, and a power supply 8 communicating with the conductive block 7 is provided at the lower end of the photomultiplier tube 1. An installation groove 9 cooperating with the sealed aluminum shell 2 is provided at one end of the photomultiplier tube 1, and a connector 10 connected to the power supply 8 is provided at the lower end of the sealed aluminum shell 2. The temperature-changing device 6 includes a heating plate 11 located at the upper end of the sealed aluminum shell 2. The heating plate 11 communicates with the connector 10. Electromagnetic elements 12 are symmetrically arranged at the upper end of the heating plate 11, and the electrodes of the two electromagnetic elements 12 are opposite. A cold end plate 13 is jointly provided at the upper ends of the two electromagnetic elements 12. A connecting member 14 contacting the display instrument 5 is provided at one end of the bottom of the cold end plate 13. A Nal crystal 15 is provided inside the sealed aluminum shell 2.

[0027] The setting of the conductive block 7 enables the power supply 8 to communicate with the voltage-dividing resistor 3, and the setting of the connector 10 enables the heating plate 11 to be connected to the power supply 8. While the heating plate 11 is powered by the power supply 8, two electromagnetic elements 12 with different magnetic poles are connected into a thermoelectric couple. After being energized, energy transfer can occur. The current flows from the negative electromagnetic element 12 to the cold end plate 13 of the positive electromagnetic element 12 to absorb heat, achieving the effect of temperature reduction. The heating plate 11 where the current flows from the positive electromagnetic element 12 to the negative electromagnetic element 12 releases heat, achieving the effect of heating the sealed aluminum shell 2. Furthermore, by adjusting the voltage of the power supply 8, the temperature of the sealed aluminum shell 2 can be maintained within a certain range, preventing the situation where the Nal crystal 15 has a large change in decay time constant, and thus achieving the effect of improving the measurement accuracy of the scintillation counter.

[0028] To facilitate the understanding of the above technical solution of the present invention, the working principle or operation method of the present invention in the actual process will be described in detail below.

[0029] In practical applications, a scintillation counter is formed by connecting a photomultiplier tube 1, a sealed aluminum shell 2, a voltage-dividing resistor 3, a follower 4, and a display instrument 5. When the device is in use, the sealed aluminum shell 2 is heated by a temperature-changing device 6, and the display instrument 5, the follower 4, and part of the voltage-dividing resistor 3 are cooled. Thus, the sealed aluminum shell 2 has a certain temperature in an environment with different temperatures, and the decay time constant of the Nal crystal 15 inside the sealed aluminum shell 2 is within a certain range, avoiding large decay changes in the Nal crystal 15. Furthermore, the data stability of the scintillation counter is improved, and the reliability of the scintillation counter is enhanced. The conductive block 7 is used to connect the power supply 8 and the voltage-dividing resistor 3, and the heating plate 11 is connected to the power supply 8 through a connector 10. When the power supply 8 supplies power to the heating plate 11, two electromagnetic elements 12 with different magnetic poles are connected to form an electric couple. After being energized, energy transfer occurs. The current flows from the negative electromagnetic element 12 to the cold end plate 13 of the positive electromagnetic element 12 to absorb heat, achieving a cooling effect, and the heating plate 11 through which the current flows from the positive electromagnetic element 12 to the negative electromagnetic element 12 releases heat, achieving the effect of heating the sealed aluminum shell 2. Furthermore, by adjusting the voltage of the power supply 8, the temperature of the sealed aluminum shell 2 is maintained within a certain range, preventing large changes in the decay time constant of the Nal crystal 15. Furthermore, the measurement accuracy of the scintillation counter is improved.

[0030] In summary, by means of the above technical solution of the present invention, when the device is in use, the sealed aluminum shell is heated by the temperature-changing device, and the display instrument, the follower, and part of the voltage-dividing resistor are cooled. Thus, the sealed aluminum shell has a certain temperature in an environment with different temperatures, and the decay time constant of the Nal crystal inside the sealed aluminum shell is within a certain range, avoiding large decay changes in the Nal crystal. Furthermore, the data stability of the scintillation counter is improved, and the reliability of the scintillation counter is enhanced.

[0031] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A radiation NaI scintillation counter, comprising a photomultiplier tube (1), characterized in that: A sealed aluminum shell (2) is provided at one end of the photomultiplier tube (1), a voltage-dividing resistor (3) is provided at one end inside the photomultiplier tube (1), a follower (4) is provided at one end of the voltage-dividing resistor (3), a display instrument (5) is provided at one end of the follower (4) away from the voltage-dividing resistor (3), and a temperature-changing device (6) is provided at the upper end of the photomultiplier tube (1).

2. A radiation Nal scintillation counter according to claim 1, characterized in that: A conductive block (7) penetrating the photomultiplier tube (1) is provided at the bottom of the voltage-dividing resistor (3), and a power supply (8) connected to the conductive block (7) is provided at the lower end of the photomultiplier tube (1).

3. A radiation Nal scintillation counter according to claim 2, characterized in that: One end of the photomultiplier tube (1) is provided with a mounting groove (9) matched with the sealed aluminum shell (2), and the lower end of the sealed aluminum shell (2) is provided with a connector (10) connected to the power supply (8).

4. A radiation Nal scintillation counter according to claim 3, characterized in that: The temperature changing device (6) comprises a heating plate (11) located at the upper end of the sealed aluminum shell (2), the heating plate (11) being connected to the connector (10), and electromagnetic elements (12) being symmetrically arranged at the upper end of the heating plate (11), and the electrodes of the two electromagnetic elements (12) being opposite.

5. A radiation Nal scintillation counter according to claim 4, characterized in that: A cold end plate (13) is commonly provided at the upper ends of the two electromagnetic elements (12), and a connecting piece (14) in contact with the display instrument (5) is provided at one end of the bottom of the cold end plate (13).

6. A radiation Nal scintillation counter according to claim 5, characterized in that: A Nal crystal (15) is arranged inside the sealed aluminum shell (2).

Images