CN216848160U - Graphite calorimeter suitable for measuring absorbed dose of multi-energy electron beam - Google Patents
Graphite calorimeter suitable for measuring absorbed dose of multi-energy electron beam Download PDFInfo
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- CN216848160U CN216848160U CN202121964799.8U CN202121964799U CN216848160U CN 216848160 U CN216848160 U CN 216848160U CN 202121964799 U CN202121964799 U CN 202121964799U CN 216848160 U CN216848160 U CN 216848160U
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Abstract
The utility model relates to a graphite calorimeter that is fit for many energy electron beam absorbed dose measurement. The conventional calorimeter can not be used for measuring the electron beam absorbed dose of a plurality of energy points, and if the absorbed dose of electron beams at different energy points is to be measured, the calorimeter with a plurality of different absorber thicknesses needs to be manufactured for a long time, and the calorimeter needs to be replaced in time for calibration, so that the reliability of measurement and calibration of the electron beam absorbed dose is difficult to ensure. The graphite calorimeter suitable for measuring the absorbed dose of the multi-energy electron beam can change graphite absorbers with different sizes at any time according to different energies of the electron beam, is used for measuring the absorbed dose of the electron beam of a plurality of energy points, and increases the application range of the calorimeter; and three thermistors are embedded in each graphite absorber for measuring temperature simultaneously, so that the accuracy and precision of measuring and calibrating the absorbed dose of the electron beam are guaranteed, the operation is simplified, and the measuring efficiency is improved.
Description
Technical Field
The utility model belongs to the technical field of the measurement of electron beam absorbed dose, concretely relates to graphite calorimeter that is fit for many energy electron beam absorbed dose measurement.
Background
The measurement methods of the absorbed dose of the electron beam are divided into two types, the first type is called an absolute measurement method, such as a calorimeter, an ionization chamber, a Fricke dosimeter and the like, and the absolute measurement method does not need calibration, and the absorbed dose value at a given position can be given by the radiation response by using certain parameters; the second category is known as relative measurement methods, such as certain solid dosimeters (e.g., alanine/ESR, thermoluminescent dosimeters, and thin film dosimeters), which must be calibrated for absolute dosimeters to give absorbed dose values via a dose response curve or function. At present, water calorimeters, graphite calorimeters, polystyrene calorimeters and the like are manufactured in many countries and applied to dose measurement of various irradiation fields.
In recent years, electron beams are more and more widely applied in the fields of national defense, industrial and agricultural production and the like, such as the irradiation examination and reinforcement of various electronic components, cable irradiation, plastic modification, irradiation disinfection of medical instruments and the like. The control of the absorbed dose of a radiation-processed product is a key parameter for quality control in the production process of electron beam irradiation. The calorimetry is a method for directly measuring the absorbed dose of an electron beam by detecting the temperature rise of an absorber of the electron beam irradiation calorimeter. Calorimetry is one of the three general methods of absolute measurement of absorbed dose, which is necessary and necessary in the field of radiation processing. However, in the existing electron beam dosimeter verification system in China, a primary metering standard device for measuring absorbed doses of electron beams with different energies based on calorimetry is relatively lacked.
The electron beam graphite calorimeter needs to select absorbers with different thicknesses according to different electron beam energies so as to ensure that the thickness of the absorber is in a linear region of a range of an electron beam in graphite. To measure the absorbed dose of the electron beam at different energy points, a plurality of calorimeters with different absorber thicknesses are required to be manufactured. This means that multiple calorimeters need to be carried if different energies of the same electron beam accelerator are to be calibrated. The method not only needs a plurality of devices to be followed for a long time, but also needs to replace the calorimeter for calibration in time, and is difficult to ensure the reliability of measurement and calibration of the absorbed dose of the electron beam. Therefore, there is a need for a calorimeter suitable for multi-energy electron beam absorbed dose measurement to ensure the reliability of the electron beam absorbed dose measurement and calibration work, and provide technical guidance and service for electron beam absorbed dose control and calibration in the increasingly developed electron beam irradiation processing industry.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a graphite calorimeter that is fit for many energy electron beam absorbed dose measurement, this calorimeter can change the graphite absorber of wherein different sizes at any time according to the different energy of electron beam for measure the electron beam absorbed dose of a plurality of energy points, increased the range of application of calorimeter, ensured the reliability of electron beam absorbed dose measurement and calibration.
In order to achieve the above purpose, the utility model adopts the technical scheme that: a graphite calorimeter suitable for measuring the absorbed dose of a multi-energy electron beam comprises a graphite absorber kit, a heat insulating layer, a graphite shell, a temperature control system and an aluminum shell;
the graphite absorber kit includes: a graphite absorber layer and a expanded polystyrene filler layer; the graphite absorber layer is embedded with thermistors, a groove for a lead to pass through is formed in the first heat insulation layer along the direction of each thermistor during wiring, the lead is arranged along the gap between the heat insulation layer and the graphite shell, is gathered in the inner layer of the graphite shell, is connected with a socket of an aviation plug arranged on the aluminum shell and is connected to an electric bridge through the aviation plug;
a hole groove is formed in the center of the heat insulation layer, the shape and the size of the hole groove are the same as those of the graphite absorber suite, and the hole groove is suitable for loading the graphite absorber suite; according to the difference of the measured nominal energy of the accelerator, selecting a graphite absorber kit combination comprising graphite absorber layers with different thicknesses to be loaded in the hole groove for measurement;
the heat insulation layer respectively wraps the graphite absorber sleeve and the graphite shell; a heating element of the temperature control system is arranged in the graphite shell, is connected with an aviation plug on the aluminum shell through a lead and is connected with an external temperature control meter; and a temperature measuring element of the temperature control system is arranged at the graphite shell and is connected with an external temperature control meter.
Further, in the graphite calorimeter suitable for measurement of a dose of a multi-energy electron beam absorber as described above, the number of thermistors embedded in the graphite absorber is 3, and the thermistors are distributed at 120 °.
Further, in the graphite calorimeter suitable for multi-energy electron beam absorption dosimetry as described above, the material of the heat insulating layer is expanded polystyrene.
Further, the graphite calorimeter suitable for multi-energy electron beam absorption dosimetry as described above, the shape of the graphite absorber layer may be selected from any one of a cylinder, an octahedron or a cuboid.
Further, a graphite calorimeter suitable for multi-energy electron beam absorbed dose measurement as described above, said being selected from any one of a thermocouple, a Pt thermal resistor, or a thermistor.
The utility model has the effects that: by adopting the device of the utility model, graphite absorbers with different sizes can be replaced at any time according to different energies of the electron beams, and the device is used for measuring the electron beam absorbed dose of a plurality of energy points; the problem that a plurality of calorimeters are required to be carried when different energies of the same electron beam accelerator are calibrated is solved; the problems that multiple devices are required to follow for a long time when the electron beam absorbed dose of multiple energy points is measured, and the reliability of the measurement result of the electron beam absorbed dose is difficult to guarantee due to the fact that the calorimeter is not calibrated timely when replaced are solved. Meanwhile, three thermistors are embedded in each graphite absorber, and the temperature of the three thermistors is always kept to be measured simultaneously, so that the accuracy and precision of measurement are improved. The device increased the range of application of calorimeter, ensured the reliability of electron beam absorbed dose measurement and calibration, also simplified the operation simultaneously, improved measurement of efficiency.
Drawings
Fig. 1 is a schematic structural view of a graphite calorimeter suitable for multi-energy electron beam absorbed dose measurement according to the present invention;
fig. 2 is a schematic structural diagram of an absorber kit in a graphite calorimeter suitable for measuring absorbed doses of multi-energy electron beams according to the present invention.
Detailed Description
The invention is further described with reference to the accompanying drawings and the detailed description.
As shown in fig. 1, a graphite calorimeter suitable for multi-energy electron beam absorbed dose measurement comprises: graphite absorber external member 1, graphite shell 2, Expanded Polystyrene (EPS) heat insulating layer 3, temperature control system and aluminium shell 4. The graphite absorber kit 1 comprises a cylindrical EPS filling layer 11 and a cylindrical graphite absorber layer 12 as shown in FIG. 2, wherein three thermistors are embedded in the graphite absorber layer 12 and are distributed at 120 degrees, a very small groove is respectively formed in a first EPS heat insulation layer 31 along the direction of each thermistor for a lead to pass through during wiring, the lead is arranged along the gaps between the EPS heat insulation layer 3 and the graphite shell 2, is gathered in the inner layer of the graphite shell 2, is respectively connected with a socket of an aviation plug arranged on the shell and is connected to an electric bridge through the aviation plug; the three thermistors are always kept to measure the temperature simultaneously, so that the accuracy and precision of measurement are improved.
The EPS heat insulation layer 3 respectively wraps the graphite absorber sleeve member 1 and the graphite shell 2; a heating element of the temperature control system is arranged in the graphite shell 2, is connected with an aviation plug on the aluminum shell 4 through a lead and is connected with an external temperature control meter; the temperature thermocouple of the temperature control system is arranged at the graphite shell 2 and is connected with an external temperature control meter.
In the embodiment, the EPS heat insulating layer 3 of the graphite calorimeter suitable for measuring the multi-energy electron beam absorbed dose is provided with a size at the center
According to the difference of the nominal energy of the accelerator during measurement, graphite absorber kits with different thicknesses are selected to be placed in the cylindrical hole grooves: when measuring the absorbed dose of an electron beam with a nominal energy of 6MeV, the size is selected to be
Is loaded into the cylindrical bore slot and placed thereon a graphite absorber layer 12 of a size
The cylindrical EPS packed layer 11 was measured; when measuring the absorbed dose of an electron beam with a nominal energy of 8MeV, the size is selected to be
Is loaded into the cylindrical bore slot and placed thereon a graphite absorber layer 12 of a size
The cylindrical EPS packed layer 11 was measured; when measuring the absorbed dose of an electron beam with a nominal energy of 10MeV, the size is selected
Is loaded into the cylindrical bore slot and placed thereon a graphite absorber layer 12 of a size
The cylindrical EPS packed layer 11 was measured; when measuring the absorbed dose of an electron beam with a nominal energy point of 12MeV, the size is selected
Is loaded into the cylindrical bore slot and placed thereon a graphite absorber layer 12 of a size
The cylindrical EPS filler layer 11 of (a) was measured.
The device of the utility model is not limited to the specific embodiment in the embodiment, the technical scheme of the present invention obtains other embodiments according to the basis of the technical scheme of the present invention, equally belongs to the technical innovation scope of the present invention.
Claims (5)
1. A graphite calorimeter suitable for measuring the absorbed dose of a multi-energy electron beam comprises a graphite absorber kit, a heat insulating layer, a graphite shell, a temperature control system and an aluminum shell; the method is characterized in that:
the graphite absorber kit includes: a graphite absorber layer and a expanded polystyrene filler layer; a thermistor is embedded in the graphite absorber layer;
a hole groove is formed in the center of the heat insulation layer, the shape and the size of the hole groove are the same as those of the graphite absorber suite, and the hole groove is suitable for loading the graphite absorber suite; according to the difference of the measured nominal energy of the accelerator, selecting a graphite absorber kit combination comprising graphite absorber layers with different thicknesses to be loaded in the hole groove for measurement;
the heat insulation layer respectively wraps the graphite absorber sleeve and the graphite shell; a heating element of the temperature control system is arranged in the graphite shell, is connected with an aviation plug on the aluminum shell through a lead and is connected with an external temperature control meter; and a temperature measuring element of the temperature control system is arranged at the graphite shell and is connected with an external temperature control meter.
2. The graphite calorimeter of claim 1, which is suitable for multi-energy electron beam absorbed dose measurement, wherein: the number of the thermistors embedded in the graphite absorber is 3, and the thermistors are distributed at 120 degrees.
3. A graphite calorimeter suitable for multi-energy electron beam absorbed dose measurement as set forth in claim 1 or 2, wherein: the material of the heat insulation layer adopts expanded polystyrene.
4. A graphite calorimeter suitable for multi-energy electron beam absorbed dose measurement as set forth in claim 3, wherein: the graphite absorber layer may have any one of a cylindrical shape, an octahedral shape, and a rectangular parallelepiped shape.
5. A graphite calorimeter suitable for multi-energy electron beam absorbed dose measurement as set forth in claim 3, wherein: the temperature measuring element is selected from any one of a thermocouple, a Pt thermal resistor or a thermistor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121964799.8U CN216848160U (en) | 2021-08-20 | 2021-08-20 | Graphite calorimeter suitable for measuring absorbed dose of multi-energy electron beam |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121964799.8U CN216848160U (en) | 2021-08-20 | 2021-08-20 | Graphite calorimeter suitable for measuring absorbed dose of multi-energy electron beam |
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| CN216848160U true CN216848160U (en) | 2022-06-28 |
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| CN202121964799.8U Active CN216848160U (en) | 2021-08-20 | 2021-08-20 | Graphite calorimeter suitable for measuring absorbed dose of multi-energy electron beam |
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