CN204067298U - A kind of radiation detector ionization chamber - Google Patents
A kind of radiation detector ionization chamber Download PDFInfo
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- CN204067298U CN204067298U CN201420367861.9U CN201420367861U CN204067298U CN 204067298 U CN204067298 U CN 204067298U CN 201420367861 U CN201420367861 U CN 201420367861U CN 204067298 U CN204067298 U CN 204067298U
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- collector electrode
- ionization chamber
- underlying basal
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Abstract
The utility model discloses a kind of radiation detector ionization chamber, comprise upper substrate, middle level substrate, underlying basal and dead ring; Be provided with dead ring between upper substrate and middle level substrate, between underlying basal and middle level substrate, be provided with dead ring; The upper surface of upper substrate is provided with collector electrode, and lower surface is metalized coated; The upper surface of middle level substrate is screening electrode, and lower surface is collector electrode; The upper surface of underlying basal is collector electrode, and lower surface is screening electrode; Underlying basal is provided with metallized fairlead and for detecting bubble-tight inspection opening.Ionization chamber of the present utility model, can ionize and produce electron beam under the effect of voltage, can possess the preliminary effect regulating expansion filter, and be convenient to install, sealing is good.
Description
Technical field
The utility model relates to the accessory of clinac, is specifically related to a kind of radiation detector ionization chamber.
Background technology
Medical electron linear accelerator X-ray detector, its principle is bombarded by X ray, the special material of inner ceramic sealant attachment produces secondary electron on locular wall and electrode, secondary electron makes interelectrode air produce ionization, generate negative ions pair, under the effect of electric field, negative ions produces induced current to displacement, the induced current voltage obtained by sample detecting, judges the dosage irradiated.By specific reduction formula, obtain the irradiation actual dose of ray, the detector of current measurement medical electron linear accelerator dosage, of a great variety, but be all adopt circular ionization chamber for accelerator internal dose monitoring system detector used, this ionization chamber arcwall face is more, and radiation detection face utilance is low, complex process, cost is higher.
In order to solve above-mentioned deficiency of the prior art, the utility model proposes a kind of new solution.
Utility model content
The purpose of this utility model is to provide a kind of radiation detector ionization chamber.
For reaching above-mentioned purpose, the technical scheme that the utility model adopts is: provide a kind of radiation detector ionization chamber, comprises upper substrate, middle level substrate, underlying basal and dead ring; Be provided with dead ring between upper substrate and middle level substrate, between underlying basal and middle level substrate, be provided with dead ring;
The upper surface of upper substrate is provided with collector electrode, and lower surface is metalized coated; The upper surface of middle level substrate is screening electrode, and lower surface is collector electrode; The upper surface of underlying basal is collector electrode, and lower surface is screening electrode; Underlying basal is provided with metallized fairlead and for detecting bubble-tight inspection opening.
Ionization chamber of the present utility model, can ionize and produce electron beam under the effect of voltage, can possess the preliminary effect regulating expansion filter, and be convenient to install, sealing is good.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present utility model;
Fig. 2 is the figure of upper substrate upper surface collector electrode;
Fig. 3 is the figure of middle level substrate lower surface collector electrode;
Fig. 4 is the upper surface collector electrode figure of underlying basal;
Fig. 5 is schematic perspective view of the present utility model.
Wherein, 1, upper substrate; 2, middle level substrate; 3, underlying basal; 4, dead ring; 5, fairlead; 6, inspection opening; 7, center; 8, the firstth district; 9, the secondth district; 10, the 3rd district; 11, the 4th district.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in detail.
In an embodiment of the present utility model, as shown in Figure 1, provide a kind of radiation detector ionization chamber, comprise upper substrate 1, middle level substrate 2, underlying basal 3 and dead ring 4; Be provided with dead ring 4 between upper substrate 1 and middle level substrate 2, between underlying basal 3 and middle level substrate 2, be provided with dead ring 4.
The upper surface of upper substrate 1 is provided with collector electrode, and lower surface is metalized coated.The upper surface of middle level substrate 2 is screening electrode, and lower surface is collector electrode; The upper surface of underlying basal 3 is collector electrode, and lower surface is screening electrode; Underlying basal 3 is provided with metallized fairlead 5 and for detecting bubble-tight inspection opening 6, fairlead 5 passes through for lead-in wire.
Operation principle of the present utility model:
Radiation detector comprises the main ionization chamber and secondary ionization room that are filled with air, and main ionization chamber is made up of upper substrate 1, dead ring 4 and middle level substrate 2; Secondary ionization room is made up of middle level substrate 2, dead ring 4 and underlying basal 3.Main ionization chamber and secondary ionization room all have two primary electrodes, and one is anode, and another is collector electrode, and anode is arranged on middle level substrate 2.The collector electrode of main ionization chamber is used for one dose measurement; Secondary ionization room comprises anode, collector electrode and segmentation collector electrode, and the collector electrode of secondary ionization room is used for two road dose measurements, and segmentation collector electrode is used for dosage distribution and detects.
As shown in Figure 2, be the collector electrode figure of upper substrate 1, collector electrode is communicated with the metalized coated of upper substrate 1 by metallized fairlead 4 on upper substrate 1.Collector electrode on upper substrate 1 is provided with some fairleads 4, the distribution shape of collector electrode can be considered as upper substrate 1 to divide into five regions, the electric field in five regions can be consistent, the region being wherein in central authorities can for circuit gain reference area, is for subsequent conditioning circuit process provides the adjustment reference value of a multiplication factor.
As shown in Figure 3, be the collector electrode of middle level substrate 2, middle level substrate 2 can be anode, and its collector electrode comprises segmentation collector electrode, and the subregion of segmentation collector electrode is corresponding with the subregion of upper substrate 1.
As shown in Figure 4, be the collector electrode figure of underlying basal 3 upper surface, this collector electrode can be identical with the collector electrode of upper substrate 1, and underlying basal 3 lower surface is screening electrode.
When the X ray of incidence is through main ionization chamber or secondary ionization room, the locular wall of collector electrode and ionization chamber inspires secondary electron, secondary electron makes interelectrode air produce ionization, generates negative ions pair.When adding a certain size voltage between anode and collector electrode, under the effect of electric field, negative ions forms electric current respectively to collector and anode direction drift, collector electrode is provided with fairlead 4, collector electrode can be connected with supporting checkout equipment with the signal of telecommunication on middle level substrate 2 anode.Because the sealing of main ionization chamber and secondary ionization room is good, in ionization chamber during the x-ray bombardment of the gas of certain volume by constant intensity, the production rate of ion pair is constant, and the signal of telecommunication detected is also constant can be measured.
In the utility model, on-chip collector electrode or segmentation collector profile and shape corresponding, substrate can be divided into five regions, be respectively the first district 9 of district 8, second, the 3rd district 10, the 4th district 11 and center 7.Usually, when using clinac, need the preliminary adjustment completed before erection water tank expansion filter, the general mode of mechanical position limitation that adopts installs ionization chamber.T-phase and the G phase of line correspondence accelerator coordinate system can be distinguished by first district 8 of ionization chamber and the 3rd district 10, the second district 9 and the 4th district 11 corresponding A phase and B phase.
When after use radiation exposure, linear accelerator injection ray, the electronics that secondary electron electric power air produces is moved generation current under electric field action, and general, the voltage of electric field of pressurization is consistent, and makes the electric field force in each region suitable.By detecting the electrical signal intensity with the fairlead 4 of zones of different collector electrode, if the transmitted intensity of certain area illumination is high, the current signal of generation is large, then can observe the detected signal value in this region by checkout equipment larger.Voltage or the current value of detection can be fed back in five regions on master console, operator is by the size that relatively can judge the zonal ray exposure at respective regions coordinate system place of magnitude of voltage size, and then an object tentatively regulated can be reached, and existing ionization chamber does not possess preliminary regulatory function.
In an embodiment of the present utility model, upper substrate 1, middle level substrate 2, underlying basal 3 and dead ring 4 are made for ceramic material.
In an embodiment of the present utility model, upper substrate 1, middle level substrate 2, the rectangular body of underlying basal 3, four drift angle places are provided with chamfering.The substrate of rectangular shape, relative to the substrate of cylindrical shape, more easily holds direction when mounted, and coordinate system direction can be allowed accurately corresponding, makes ionization chamber possess the effect of rough adjustment expansion filter.
In an embodiment of the present utility model, also comprise fixed frame, fixed frame is linked in the periphery of upper substrate 1, middle level substrate 2 and underlying basal 3, fixed frame can by the surrounding of ionization chamber closely frame be combined, be convenient to install, strengthen stability.
Although describe in detail embodiment of the present utility model by reference to the accompanying drawings, should not be construed as the restriction of the protection range to this patent.In the scope described by claims, the various amendment that those skilled in the art can make without creative work and distortion still belong to the protection range of this patent.
Claims (4)
1. a radiation detector ionization chamber, is characterized in that: comprise upper substrate, middle level substrate, underlying basal and dead ring; Be provided with dead ring between upper substrate and middle level substrate, between underlying basal and middle level substrate, be provided with dead ring;
The upper surface of described upper substrate is provided with collector electrode, and lower surface is metalized coated; The upper surface of described middle level substrate is screening electrode, and lower surface is collector electrode; The upper surface of described underlying basal is collector electrode, and lower surface is screening electrode; Described underlying basal is provided with metallized fairlead and for detecting bubble-tight inspection opening.
2. radiation detector ionization chamber as claimed in claim 1, is characterized in that: described upper substrate, middle level substrate, underlying basal and dead ring are that ceramic material is made.
3. radiation detector ionization chamber as claimed in claim 1, is characterized in that: described upper substrate, middle level substrate, the rectangular body of underlying basal, four drift angle places are provided with chamfering.
4. radiation detector ionization chamber as claimed in claim 1, it is characterized in that: also comprise fixed frame, fixed frame is linked in the periphery of upper substrate, middle level substrate and underlying basal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420367861.9U CN204067298U (en) | 2014-07-04 | 2014-07-04 | A kind of radiation detector ionization chamber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420367861.9U CN204067298U (en) | 2014-07-04 | 2014-07-04 | A kind of radiation detector ionization chamber |
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| Publication Number | Publication Date |
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| CN204067298U true CN204067298U (en) | 2014-12-31 |
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| CN201420367861.9U Active CN204067298U (en) | 2014-07-04 | 2014-07-04 | A kind of radiation detector ionization chamber |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104916512A (en) * | 2015-04-30 | 2015-09-16 | 陈立新 | Air flat-plate ionization chamber and dosimeter with ionization chamber |
| CN113703028A (en) * | 2021-09-20 | 2021-11-26 | 中国计量科学研究院 | Medical accelerator monitoring ionization chamber |
-
2014
- 2014-07-04 CN CN201420367861.9U patent/CN204067298U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104916512A (en) * | 2015-04-30 | 2015-09-16 | 陈立新 | Air flat-plate ionization chamber and dosimeter with ionization chamber |
| CN113703028A (en) * | 2021-09-20 | 2021-11-26 | 中国计量科学研究院 | Medical accelerator monitoring ionization chamber |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |