CN103472475A - Transmission-type monitoring ionization chamber suitable for low-energy X-ray measurement - Google Patents
Transmission-type monitoring ionization chamber suitable for low-energy X-ray measurement Download PDFInfo
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- CN103472475A CN103472475A CN2012101877083A CN201210187708A CN103472475A CN 103472475 A CN103472475 A CN 103472475A CN 2012101877083 A CN2012101877083 A CN 2012101877083A CN 201210187708 A CN201210187708 A CN 201210187708A CN 103472475 A CN103472475 A CN 103472475A
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Abstract
The invention belongs to the dosage measurement technology field and discloses a transmission-type monitoring ionization chamber suitable for low-energy X-ray measurement. The ionization chamber comprises a support structure, an insulation sleeve, a support ring, an insulation column, a collector and high-voltage electrodes. The ionization chamber is a three-layer electrode structure, which means that there are two high-voltage electrodes and one collector. A center of the ionization chamber is provided with the curing sensitive volume support ring. The ionization chamber can be used for the low-energy X-ray measurement. The sensitive volume is stable and electric leakage is small.
Description
Technical field
The invention belongs to the dosage measurement technical field, be specifically related to
oneplant and be suitable for the transmission-type monitor ionization chamber that low energy X ray is measured.
Background technology
The ray generators such as X-ray production apparatus, its output quantity can have certain undulatory property along with the time, the very high occasion for accuracy requirement, this fluctuation can bring very large impact.Simultaneously, when using X-ray machine to be calibrated the Radiation monitoring instrument, need to change the X-ray machine output dose by regulating the X-ray machine tube current, and on controller, the indicating value electric current does not often become strict linear relationship with output dose.Therefore must adopt monitoring equipment to be monitored the output dose of X-ray production apparatus, the most frequently used monitoring equipment is the transmission-type ionization chamber.
To the transmission-type ionization chamber of X-ray machine output dose monitoring, its structure mainly comprises high-pressure stage and collector, need to meet the condition of the following aspects:
(1) material that the use atomic number is lower is as high-field electrode.For fear of the impact on dosage measurement, usually adopt metal Be that atomic number is lower as high-field electrode.Because metallic beryllium has certain hardness, can support a fixing sensitive volume simultaneously.Photon radiation monitoring for the above energy of 30keV, metallic beryllium can meet the measurement requirement, if but the photon of the following energy of use 30keV, metal Be can not meet the demands, reason is that metallic beryllium is in order to guarantee that the needed minimum thickness of certain degree of hardness is still partially thick, can cause the appropriateness decay of low energy X ray, can there be very large departing from the power spectrum of so final generation and the power spectrum of requirement.
(2) ionization chamber, as the equipment of long term monitoring X ray output dose, must have a stable sensitive volume, in this sensitive volume inside, possesses uniform Electric Field Distribution.Simultaneously, in order to guarantee that, in monitored dose rate scope, this sensitive volume again can not be too small, to guarantee enough large sensitivity.
(3) monitor ionization chamber is as Transfer Standards equipment, and what electric leakage will be enough is little, and then guarantees its long-time stability and measuring repeatability.
Conventional monitor ionization chamber guarantees that by the hardness of high-pressure stage self stable sensitive volume structure ，Qi center collector is clipped on the ionization chamber supporting construction, relies on the insulation of supporting construction self to reduce leakage current.This ionization chamber has the shortcoming of following 3 aspects: (1) ionization chamber sensitive volume is by the realization of double layer of metal pole plate, if metal level self is unstable, the ionization chamber sensitive volume will change; (2) ionization chamber electric leakage is wayward, and this ionization chamber relies on the insulation of supporting construction self to control electric leakage, and collector and supporting construction surface of contact are large, and surface leakage is as easy as rolling off a log is subject to extraneous temperature and humidity conditions affects; (3) entrance window is blocked up, can not meet the requirement of under the prerequisite that does not as far as possible change the lower energy photon power spectrum, its input dosage being monitored.
Summary of the invention
(1) goal of the invention
According to existing existing problem, the present invention proposes a kind of transmission-type monitor ionization chamber that low energy X ray is measured that is suitable for, this ionization chamber can be used for the low energy X ray measurement and sensitive volume is stablized, leaks electricity little.
(2) technical scheme
In order to address the above problem, the present invention is achieved by the following technical solutions:
A kind of transmission-type monitor ionization chamber that is suitable for the low energy X ray measurement, this ionization chamber comprises supporting construction, insulation sleeve, support ring, insulated column, collector, high-pressure stage, key is, this ionization chamber is the triple electrode structure, i.e. two high-pressure stages and a collector; The center of ionization chamber is equipped with the support ring that solidifies sensitive volume.
The material of described support ring is copper; Described insulated column is three insulation columns, and material is teflon; The material of described collector and high-pressure stage is the calorize polyester film, and its thickness is 1 ~ 10 μ m; Supporting construction and insulation sleeve are threaded connection.
(3) beneficial effect
Adopt the beneficial effect that ionization chamber provided by the invention has to be: (1) can meet the Radiation monitoring of lower energy photon.Adopt the material of calorize mylar as electrode, thickness is 1 ~ 10 μ m, can be used for the Radiation monitoring of the following energy photon of 30keV; (2) sensitive volume is fixed.Adopt the support ring that copper ring is sensitive volume, the sensitive volume of ionization chamber is fixed; (3) effectively reduce the ionization chamber electric leakage.Adopt three insulation columns by collector and external isolation, farthest reduced contact area, reduced electric leakage.
The accompanying drawing explanation
Fig. 1 transmission-type monitor ionization chamber cross sectional representation;
1, ionization chamber external support structure; 2, insulation sleeve; 3, support ring; 4 insulated columns; 5, collector; 6, high-pressure stage; 7, concentric cable.
Fig. 2 column schematic diagram that insulate.
Embodiment
Below in conjunction with specification drawings and specific embodiments, the present invention is further elaborated.
A kind of transmission-type monitor ionization chamber that is suitable for the low energy X ray measurement, this ionization chamber comprises supporting construction 1, insulation sleeve 2, support ring 3, insulated column 4, collector 5, high-pressure stage 6, key is, this ionization chamber is the triple electrode structure, i.e. two high-pressure stages and a collector; The center of ionization chamber is equipped with the support ring that solidifies sensitive volume.
Described supporting construction 1 is the monitor ionization chamber external support structure, and the while is as the bracing frame of high-pressure stage 6; Be equipped with insulation sleeve 2 between described supporting construction 1 and support ring 3, insulation sleeve 2 makes supporting construction 1 and support ring 3 insulation, and the effect of support ring 3 is to solidify on the one hand sensitive volume, as the supporting construction of collector 5 and the material of support ring 3, is copper on the other hand; Described insulated column 4 is insulation three posts, and material is teflon, between support ring 3 and collector 5, makes to insulate between the two; The material of described collector 5 and high-pressure stage 6 is the calorize polyester film, and its thickness is 1 ~ 10 μ m, and manufacturing process is the dual way by hard pressure and adhesion, and polyester film is fixed on aluminium sash; Collector 5 is connected with reading and high-pressure system by concentric cable 7 with high-pressure stage 6.
In the present embodiment, the diameter of ionization chamber used is 85mm, and the degree of depth is 2cm, and it is 6 μ m that high-pressure stage and collector all adopt thickness
'sthe calorize polyester film.
Monitor ionization chamber does not need specifically to provide position dosage, but need to be in be concerned about dose rate scope, and its ionization current is constant with the ratio of the air kerma value of reference position.For different radiation qualities, after obtaining this constant, just can in daily calibration operation, by the value that respectively reads monitor ionization chamber, obtain the conventional true value of each calibrating position like this.In 52 μ Gy/min ~ 4163 μ Gy/min scopes, operating voltage is+200V, and the ratio of measuring ionization chamber ionization current and 1m place air kerma is as following table:
As can be seen from Table 1,1m place air kerma rate scope is under 52 μ Gy/min ~ 4163 μ Gy/min scopes, and the variation of the ratio of the air kerma value of its ionization current and reference point locations is less than 0.2%, can be considered constant, meets the Dose standard requirement.
Claims (4)
1.
oneplant and be suitable for the transmission-type monitor ionization chamber that low energy X ray is measured, this ionization chamber comprises supporting construction (1), insulation sleeve (2), support ring (3), insulated column (4), collector (5), high-pressure stage (6), it is characterized in that, this ionization chamber is the triple electrode structure, i.e. two high-pressure stages and a collector; The center of ionization chamber is equipped with the support ring that solidifies sensitive volume; The material of support ring (3) is copper; The material of collector (5) and high-pressure stage (6) is the calorize polyester film, and its thickness is 1 ~ 10 μ m.
2. according to claim 1
oneplant and be suitable for the transmission-type monitor ionization chamber that low energy X ray is measured, it is characterized in that, described insulated column (4) is three insulation columns, and material is teflon.
3. according to claim 1
oneplant and be suitable for the transmission-type monitor ionization chamber that low energy X ray is measured, it is characterized in that, described collector (5) and high-pressure stage (6) all are fixed on aluminium sash.
4. according to claim 1
oneplant and be suitable for the transmission-type monitor ionization chamber that low energy X ray is measured, it is characterized in that, described supporting construction (1) and insulation sleeve (2) are threaded connection.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210187708.3A CN103472475B (en) | 2012-06-08 | 2012-06-08 | A kind of transmission-type monitor ionization chamber being suitable for low energy X ray and measuring |
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| CN201210187708.3A CN103472475B (en) | 2012-06-08 | 2012-06-08 | A kind of transmission-type monitor ionization chamber being suitable for low energy X ray and measuring |
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| CN103472475A true CN103472475A (en) | 2013-12-25 |
| CN103472475B CN103472475B (en) | 2015-09-30 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105629286A (en) * | 2016-01-28 | 2016-06-01 | 中国计量科学研究院 | Ionization chamber used for measuring ambient dose equivalent |
| CN109459780A (en) * | 2018-12-26 | 2019-03-12 | 中国原子能科学研究院 | It is a kind of for pulse X, the plane ionization chamber of gamma-rays dosage measurement |
| CN110261883A (en) * | 2019-06-27 | 2019-09-20 | 上海联影医疗科技有限公司 | Dose monitoring device and radiotherapy unit |
| 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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| JP2004212318A (en) * | 2003-01-08 | 2004-07-29 | Shimadzu Corp | X-ray exposure dosemeter |
| CN101158723A (en) * | 2006-02-10 | 2008-04-09 | 中国人民解放军63960部队 | End window ionization chamber |
| CN201975365U (en) * | 2011-03-04 | 2011-09-14 | 中国原子能科学研究院 | Transmission ionization chamber for monitoring proton beam current of over 15 MeV on line |
| CN202661630U (en) * | 2012-06-08 | 2013-01-09 | 中国原子能科学研究院 | Transmission type monitoring ionization chamber suitable for measurement of low-energy X-rays |
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2012
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2004212318A (en) * | 2003-01-08 | 2004-07-29 | Shimadzu Corp | X-ray exposure dosemeter |
| CN101158723A (en) * | 2006-02-10 | 2008-04-09 | 中国人民解放军63960部队 | End window ionization chamber |
| CN201975365U (en) * | 2011-03-04 | 2011-09-14 | 中国原子能科学研究院 | Transmission ionization chamber for monitoring proton beam current of over 15 MeV on line |
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| 安继刚等: "X射线电离室的研制", 《冶金自动化》, 28 October 1979 (1979-10-28) * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105629286A (en) * | 2016-01-28 | 2016-06-01 | 中国计量科学研究院 | Ionization chamber used for measuring ambient dose equivalent |
| CN105629286B (en) * | 2016-01-28 | 2018-11-09 | 中国计量科学研究院 | A kind of ionisation chamber measuring Neutron Ambient Dose Equivalent |
| CN109459780A (en) * | 2018-12-26 | 2019-03-12 | 中国原子能科学研究院 | It is a kind of for pulse X, the plane ionization chamber of gamma-rays dosage measurement |
| CN110261883A (en) * | 2019-06-27 | 2019-09-20 | 上海联影医疗科技有限公司 | Dose monitoring device and radiotherapy unit |
| 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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| CN103472475B (en) | 2015-09-30 |
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