CN210347946U - Off-axis single-reflection gamma measuring system - Google Patents
Off-axis single-reflection gamma measuring system Download PDFInfo
- Publication number
- CN210347946U CN210347946U CN201921129559.9U CN201921129559U CN210347946U CN 210347946 U CN210347946 U CN 210347946U CN 201921129559 U CN201921129559 U CN 201921129559U CN 210347946 U CN210347946 U CN 210347946U
- Authority
- CN
- China
- Prior art keywords
- axis
- optical lens
- measurement system
- installation cylinder
- gamma measurement
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Measurement Of Radiation (AREA)
Abstract
The utility model discloses an off-axis single-reflection gamma measuring system, which comprises an installation cylinder, wherein one end of the installation cylinder is provided with a sealing window, the other end of the installation cylinder is provided with an air valve, the middle part of the installation cylinder forms an air chamber for containing a radiation medium, the air valve is used for filling the radiation medium into the air chamber or extracting the radiation medium in the air chamber outwards, the inner side of the sealing window is provided with a conversion body, an off-axis optical lens is arranged in the installation cylinder, and the side wall of the installation cylinder is provided with an optical glass window corresponding to the position of the off-axis optical lens and is connected with an; the utility model has the advantages that: the method has the advantages of fast time response, high photon collection efficiency, strong anti-interference capability, threshold value adjusting function, convenience in adjustment, and great application value in measuring the intensity of the weak gamma rays above the threshold value and the time evolution process in the complex radiation environment.
Description
Technical Field
The utility model belongs to the technical field of inertial confinement fusion physics, concretely relates to off-axis single trans gamma measurement system.
Background
The ray intensity refers to the sum of the energies of the number of rays passed per unit time per unit area perpendicular to the direction of propagation of the ray. The ray time evolution process refers to the change process of ray intensity along with the time. Radiation intensity measurements typically involve exposing the film to light during radiographic testing, or exposing radiation detectors to electrons or photons during radiographic testing, which typically does not have time course measurement capability.
In the inertial confinement fusion physical research, the intensity of gamma rays with specific energy and a time evolution process are required to be measured under a complex radiation environment. Generally, the intensity of gamma rays to be measured is weak, and the measurement of weak gamma signals in a strong radiation background environment requires that a measurement system has high collection efficiency and certain anti-interference capability. In the inertial confinement fusion physical research, gamma rays to be detected occur in a short time (hundred picoseconds), and a detection system is required to have high time resolution capability in the process of measuring the time evolution of the gamma rays.
For this reason, it is urgently needed to design a gamma measuring system having a fast time response and a high collection efficiency and having a threshold value adjusting function.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides an off-axis single reflection formula gamma measurement system. Based on the air chamber type straight cylinder structure, the small optical path difference of the gamma conversion electron excited photons is realized, and the system has high time resolution capability. And an off-axis single-reflection structure design is adopted, so that the high-efficiency convergence collection of gamma excitation radiation photons is realized. The 90-degree off-axis design avoids the interference signals generated by the ambient gamma rays in the glass pressure window, and improves the anti-interference capability of the system under the condition of ensuring high-efficiency collection of photons. The threshold energy of the excitation Cerenkov radiation can be adjusted by changing the pressure of the medium gas, so that background interference rays in the measuring environment are prevented.
In order to achieve the above purpose, the utility model discloses technical scheme as follows:
an off-axis single-reflection gamma measuring system is characterized in that: the device comprises an installation cylinder, wherein one end of the installation cylinder is provided with a sealing window, the other end of the installation cylinder is provided with an air valve, the middle part of the installation cylinder forms an air chamber for containing a radiation medium, the air valve is used for filling the radiation medium into the air chamber or extracting the radiation medium in the air chamber outwards, the inner side of the sealing window is provided with a conversion body, an off-axis optical lens is arranged in the installation cylinder, and the side wall of the installation cylinder is provided with an optical glass window corresponding to the position of the off-axis optical lens and connected with an optical recording component; incident gamma rays enter the conversion body through the sealing window to generate conversion electrons, cerenkov photons are excited in a radiation medium of the air chamber, are collected by off-axis convergence of the off-axis optical lens and enter the photon recording assembly through the optical glass window.
By adopting the structure, gamma rays enter the conversion body through the sealed window at the left end of the installation cylinder, conversion electrons are generated through the Compton effect and the electron pair effect and enter the installation cylinder, high-purity carbon dioxide gas is sent into the installation cylinder through the gas valve at the right end of the installation cylinder in advance, and then the conversion electrons excite Cerenkov photons in the radiation medium carbon dioxide. Based on the conversion principle, the optical path difference for exciting the Cerenkov photons is small, and the system is guaranteed to have high time resolution capability. Meanwhile, the threshold energy of the excited photons is related to the pressure of the gas of the radiation medium, so that the threshold energy of the gamma rays measured by the system can be changed by adjusting the gas pressure, and the background interference of the gamma rays in the measurement environment is prevented. After the Cerenkov photons are generated, the off-axis paraboloidal optical lens carries out 90-degree off-axis high-efficiency convergence and collection on the photons and sends the photons into the photon recording component, and the signal output by the photon recording component in the photon recording component can reflect the gamma ray intensity entering the measuring system. By adopting the high-time-resolution photon recording component, the time waveform of the output signal can reflect the time evolution process of the gamma ray.
Preferably, the method comprises the following steps: the side wall of the mounting cylinder is provided with a light avoiding cover corresponding to the position of the off-axis optical lens, the light avoiding cover is communicated with the inside of the mounting cylinder, the photon recording assembly comprises a shielding part arranged at one end, far away from the mounting cylinder, of the light avoiding cover, and a photon recording part is arranged in the shielding part. By adopting the structure, the light shielding cover can prevent natural light under the measuring environment from entering the photon recording component to generate interference signals, and the shielding component prevents environment background gamma rays from entering the photon recording component to generate interference signals, so that the measuring accuracy is improved.
Preferably, the method comprises the following steps: the optical glass window is arranged between the light avoiding cover and the mounting cylinder. By adopting the structure, Cerenkov photons collected by the 90-degree off-axis enter the shielding component through the optical glass window, so that incident gamma rays or gamma conversion electrons can be prevented from directly entering the optical glass window to generate interference Cerenkov effect signals, and the accuracy of threshold setting of the measuring system is ensured.
Preferably, the method comprises the following steps: the mounting cylinder is provided with a supporting plate at the end part close to the air valve, the supporting plate is provided with a positioning column extending towards the direction of the off-axis optical lens, the off-axis optical lens is supported on the positioning column, the off-axis optical lens is fixedly connected with the supporting plate through bolts, and the bolts are distributed along the circumferential direction of the supporting plate. By adopting the structure, the off-axis optical lens can be conveniently installed.
Preferably, the method comprises the following steps: a ball head is arranged at one end, close to the off-axis optical lens, of the positioning column, and a spherical hinge seat matched with the ball head is arranged at the position, corresponding to the ball head, of the off-axis optical lens. By adopting the structure, the spherical hinge seat is used as the mounting fulcrum of the off-axis optical lens, so that the mounting precision of the off-axis optical lens can be improved, and the adjustment is convenient.
Preferably, the method comprises the following steps: and a pressure gauge is arranged at one end of the mounting cylinder, which is positioned on the air valve. Adopt above-mentioned structure to measure the pressure of the inside radiation medium of installation section of thick bamboo conveniently.
Preferably, the method comprises the following steps: the shielding component is of a closed structure and is made of a lead material. By adopting the structure, the gamma rays at the background of the environment can be prevented from entering the photon recording component to generate interference signals.
Preferably, the method comprises the following steps: the photon recording component is a photoelectric tube. By adopting the structure, the photoelectric tube with high time resolution can measure the time evolution information of the incident gamma ray.
Preferably, the method comprises the following steps: the material of the window is aluminum. With the above structure, the attenuation of incident gamma rays can be reduced.
Compared with the prior art, the beneficial effects of the utility model are that:
adopt the utility model provides an off-axis single trans-form gamma measurement system has fast time corresponding, high photon collection efficiency and stronger interference killing feature to possess threshold value regulatory function, and adjust the convenience, measure weak gamma ray intensity and the time evolution process above the threshold value under complicated radiation environment and have very big using value. And secondly, the measurement system adopts an off-axis single-reflection design, and carries out 90-degree off-axis convergence collection on the excited Cerenkov radiation photons, so that the feasibility of designing the side surface of the optical glass window is met.
Drawings
Fig. 1 is a schematic structural view of the present invention;
fig. 2 is a cross-sectional view of the present invention;
fig. 3 is a partial enlarged view of the point i in fig. 2.
Detailed Description
The present invention will be further described with reference to the following examples and accompanying drawings.
As shown in fig. 1 and 2, an off-axis single-reflection gamma measuring system, the structure of which comprises an installation cylinder 1 with a hollow structure inside, the left end of the installation cylinder 1 is provided with a sealing window 2 made of aluminum, the right end is provided with an air valve 3 used for charging and discharging carbon dioxide gas into and out of the installation cylinder 1, the inner side of the sealing window 2 is provided with a conversion body 4, the installation cylinder 1 is internally provided with an off-axis optical lens 5, the side wall of the installation cylinder 1 is sequentially provided with an optical glass window 12 corresponding to the position of the off-axis optical lens 5, a light shielding cover 6 and a photon recording component a, wherein the photon recording component a is composed of a shielding component 7 and a photon recording component 8 positioned inside the shielding component 7, and the optical glass window 12, the light shielding cover 6 and the photon recording component a are sequentially arranged.
When the gamma ray is measured, the gamma ray enters the conversion body 4 through the sealing window 2 at the left end of the installation cylinder 1, conversion electrons are generated through the Compton effect and the electron pair effect and enter the installation cylinder 1, high-purity carbon dioxide gas enters the installation cylinder 1 through the air valve 3 at the right end of the installation cylinder 1, the conversion electrons excite Cerenkov photons in a radiation medium carbon dioxide, and based on the conversion principle, the optical path difference for exciting the Cerenkov photons is small, so that the system is guaranteed to have high time resolution capability. Meanwhile, the threshold energy of the excited photons is related to the pressure of the radiation medium gas, so that the threshold energy of the gamma rays measured by the system can be changed by adjusting the pressure of the carbon dioxide gas, and the background interference of the gamma rays in the measuring environment is prevented.
After Cerenkov photons are generated, the off-axis optical lens 5 collects the photons in a 90-degree off-axis convergence manner, the photons enter the photon recording component 8 arranged inside the shielding component 7 through the optical glass window 12 on the side surface of the mounting cylinder 1, the signal intensity output by the photon recording component 8 can reflect the gamma ray intensity entering the measuring system, and the time waveform of the output signal can reflect the time evolution process of the gamma ray.
The measurement system is designed in an off-axis single-reflection mode, the off-axis optical lens 5 preferably adopts a 90-degree off-axis paraboloidal optical lens, excited Cerenkov radiation photons are collected in an off-axis convergence mode at 90 degrees, the advantages of high photon collection efficiency are achieved, the feasibility of designing the side face of the optical glass window 12 is further met, the photon recording component 8 is located on the radial outer side of the installation cylinder 1, the limitation of a space structure is avoided, the size of the shielding component 7 can be set according to needs, the shielding performance design in a strong radiation environment is guaranteed, the anti-interference capability of the system is improved, and therefore high-signal-ratio gamma ray measurement can be achieved.
The strong anti-interference capability of the measuring system is shown as the following points: 1. the light avoiding cover 6 can prevent natural light under the measuring environment from entering the photon recording component 8 to generate interference signals; 2. the shielding part 7 is of a closed structure and is made of lead materials, and can prevent environmental background gamma rays from entering the photon recording part 8 to generate interference signals; 3. the optical glass window 12 is made of optical glass with high light transmission performance of Cerenkov photons and is positioned on the side wall of the installation cylinder 1 corresponding to the off-axis optical lens 5, and when high-efficiency collection of photons is achieved, environmental gamma rays or gamma conversion electrons can be prevented from directly entering the optical glass window 12 to generate interference Cerenkov effect signals.
As shown in fig. 3, a supporting plate 9 is arranged at an end of the mounting cylinder 1 close to the air valve 3, a positioning column 9a extending in a direction of the off-axis optical lens 5 is arranged on the supporting plate 9, a ball head 9b is arranged at an end of the positioning column 9a close to the off-axis optical lens 5, a ball hinge seat 5a adapted to the ball head 9b is arranged at a position of the off-axis optical lens 5 corresponding to the ball head 9b, the off-axis optical lens 5 is supported on the positioning column 9a by taking the ball head 9b as an installation fulcrum, and is fixedly connected with the supporting plate 9 through bolts 10 distributed along the circumferential direction of the supporting plate 9, so that the installation accuracy of the off-axis optical lens 5 can be effectively improved, and the assembly.
In order to measure the pressure of the radiation medium in the installation cylinder 1 conveniently, a pressure gauge 11 is installed at one end, located on the air valve 3, of the installation cylinder 1.
The photon recording component 8 adopts a photoelectric tube sensitive to Cerenkov photons, and the photoelectric tube with high time resolution can measure the time evolution information of incident gamma rays.
The converter 4 is made of high-purity graphite, and the thickness of the converter is determined according to the energy of gamma rays to be measured.
Finally, it should be noted that the above description is only a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and the scope of the present invention.
Claims (10)
1. An off-axis single-reflection gamma measurement system, comprising: the optical fiber radiation detector comprises an installation barrel (1), wherein one end of the installation barrel (1) is provided with a sealing window (2), the other end of the installation barrel is provided with an air valve (3), the middle part of the installation barrel forms an air chamber for containing a radiation medium, the air valve (3) is used for filling the radiation medium into the air chamber or extracting the radiation medium in the air chamber outwards, the inner side of the sealing window (2) is provided with a conversion body (4), an off-axis optical lens (5) is arranged in the installation barrel (1), and the side wall of the installation barrel (1) is provided with an optical glass window (12) corresponding to the off-axis optical lens (5) and is connected with an optical recording component (; incident gamma rays enter the conversion body (4) through the sealing window (2) to generate conversion electrons, cerenkov photons are excited in a radiation medium of the air chamber, are collected in an off-axis converging mode through the off-axis optical lens (5), and enter the photon recording assembly (A) through the optical glass window (12).
2. The off-axis single trans gamma measurement system of claim 1, wherein: the installation section of thick bamboo (1) lateral wall corresponds off-axis optical lens (5) position and is equipped with light avoiding cover (6), this light avoiding cover (6) and the inside intercommunication of installation section of thick bamboo (1), photon record subassembly (A) is including setting up shielding part (7) of keeping away from installation section of thick bamboo (1) one end in light avoiding cover (6), installs photon record part (8) in shielding part (7).
3. The off-axis single trans gamma measurement system of claim 2, wherein: the optical glass window (12) is arranged between the light avoiding cover (6) and the mounting cylinder (1).
4. An off-axis single trans gamma measurement system according to claim 1 or 2 or 3, wherein: the mounting cylinder (1) is close to one end part of the air valve (3) and is provided with a supporting plate (9), a positioning column (9a) extending towards the direction of the off-axis optical lens (5) is arranged on the supporting plate (9), the off-axis optical lens (5) is supported on the positioning column (9a), the off-axis optical lens (5) is fixedly connected with the supporting plate (9) through a bolt (10), and the bolt (10) is distributed along the circumferential direction of the supporting plate (9).
5. The off-axis single trans gamma measurement system of claim 4, wherein: a ball head (9b) is arranged at one end, close to the off-axis optical lens (5), of the positioning column (9a), and a spherical hinge seat (5a) matched with the ball head (9b) is arranged at the position, corresponding to the ball head (9b), of the off-axis optical lens (5).
6. The off-axis single trans gamma measurement system of claim 5, wherein: and a pressure gauge (11) is arranged at one end, located on the air valve (3), of the mounting cylinder (1).
7. The off-axis single trans gamma measurement system of claim 3, wherein: the shielding component (7) is of a closed structure and is made of lead materials.
8. The off-axis single trans gamma measurement system of claim 7, wherein: the photon recording component (8) is a photoelectric tube.
9. The off-axis single trans gamma measurement system of claim 1, wherein: the material of the sealing window (2) is aluminum.
10. The off-axis single trans gamma measurement system of claim 1, wherein: the radiation medium is carbon dioxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921129559.9U CN210347946U (en) | 2019-07-18 | 2019-07-18 | Off-axis single-reflection gamma measuring system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921129559.9U CN210347946U (en) | 2019-07-18 | 2019-07-18 | Off-axis single-reflection gamma measuring system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210347946U true CN210347946U (en) | 2020-04-17 |
Family
ID=70198759
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921129559.9U Active CN210347946U (en) | 2019-07-18 | 2019-07-18 | Off-axis single-reflection gamma measuring system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210347946U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110244340A (en) * | 2019-07-18 | 2019-09-17 | 中国工程物理研究院激光聚变研究中心 | The off-axis single lens reflex type gamma survey system of Air-chamber type |
| CN111736198A (en) * | 2020-06-19 | 2020-10-02 | 中国科学院西安光学精密机械研究所 | Compact gamma ray detection optical system and detection method |
-
2019
- 2019-07-18 CN CN201921129559.9U patent/CN210347946U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110244340A (en) * | 2019-07-18 | 2019-09-17 | 中国工程物理研究院激光聚变研究中心 | The off-axis single lens reflex type gamma survey system of Air-chamber type |
| CN111736198A (en) * | 2020-06-19 | 2020-10-02 | 中国科学院西安光学精密机械研究所 | Compact gamma ray detection optical system and detection method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN210347946U (en) | Off-axis single-reflection gamma measuring system | |
| JP2008256630A (en) | Energy compensation scintillation type photon dosimeter | |
| JP4901773B2 (en) | Radiation monitor | |
| US7626174B2 (en) | X-ray detector with correction for scattered radiation | |
| CN111060289B (en) | High-sensitivity coronagraph stray light detection device | |
| CN101285769A (en) | Gas measuring method and its device | |
| CN112180423B (en) | Magnetic confinement nuclear fusion gamma ray detector with Compton inhibition function | |
| JP2008256631A (en) | One-centimeter dose equivalent meter-usage scintillation detector | |
| JP2008122111A (en) | Radiation detector | |
| CN112799118B (en) | Scintillation detector capable of improving detection efficiency and detection method thereof | |
| CN219625720U (en) | Imaging system based on scintillation fiber array | |
| CN116539649A (en) | Positron annihilation life measurement system and method based on position localization | |
| CN108802792A (en) | The measuring device and method of radioactivity inert gas | |
| CN112180419A (en) | Detection unit, detection part and detector of air tritium | |
| CN203849188U (en) | Double-energy X-ray imaging detector | |
| CN110244340A (en) | The off-axis single lens reflex type gamma survey system of Air-chamber type | |
| CN217213181U (en) | Beta activity monitoring device for explosion-proof gas pipeline in high gamma background environment | |
| CN213633848U (en) | Neutron-gamma ray combined detection device | |
| CN201229295Y (en) | Gas measuring device | |
| JP2007225569A (en) | Scintillation detector | |
| CN221426886U (en) | Novel high-integration beta ray scintillation detector with heating function | |
| Dong et al. | Design and assembly of the CsI (Tl) crystal module of the BES electro-magnetic calorimeter | |
| JP4989102B2 (en) | Charged particle measuring device | |
| CN209840987U (en) | Tellurium-zinc-cadmium back scattering thickness gauge | |
| CN220231986U (en) | Acquisition device for detecting radon content |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |