CN103472475B - A kind of transmission-type monitor ionization chamber being suitable for low energy X ray and measuring - Google Patents
A kind of transmission-type monitor ionization chamber being suitable for low energy X ray and measuring Download PDFInfo
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- CN103472475B CN103472475B CN201210187708.3A CN201210187708A CN103472475B CN 103472475 B CN103472475 B CN 103472475B CN 201210187708 A CN201210187708 A CN 201210187708A CN 103472475 B CN103472475 B CN 103472475B
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Abstract
The invention belongs to dosage measurement technical field, disclose a kind of transmission-type monitor ionization chamber being suitable for low energy X ray and measuring.This ionization chamber comprises supporting construction, insulation sleeve, support ring, insulated column, collector, high-pressure stage, and key is, this ionization chamber is three layers of electrode structure, i.e. two high-pressure stages and a collector; The center of ionization chamber is equipped with the support ring of solidification sensitive volume.This ionization chamber can be used for low energy X ray measure and sensitive volume stablize, leak electricity little.
Description
Technical field
The invention belongs to dosage measurement technical field, be specifically related to
oneplant the transmission-type monitor ionization chamber being suitable for low energy X ray and measuring.
Background technology
The ray generators such as X-ray production apparatus, its output quantity can have certain undulatory property along with the time, and for the occasion that accuracy requirement is very high, this fluctuation can bring very large impact.Meanwhile, when using X-ray machine to calibrate Radiation monitoring instrument, need by regulating X-ray machine tube current to change X-ray machine output dose, and on controller, indicating value electric current does not often become strict linear relationship with output dose.Therefore the output dose of monitoring equipment to X-ray production apparatus must be adopted to monitor, and the most frequently used monitoring equipment is 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, the condition of demand fulfillment the following aspects:
(1) use the material that atomic number is lower as high-field electrode.In order to avoid the impact on dosage measurement, usually adopt the metal Be that atomic number is lower as high-field electrode.Simultaneously because metallic beryllium has certain hardness, a fixing sensitive volume can be supported.Photon radiation for more than 30keV energy is monitored, metallic beryllium can meet measurement requirement, if but use the photon of below 30keV energy, metal Be then can not meet the demands, reason is that metallic beryllium is still partially thick in order to ensure the minimum thickness required for certain degree of hardness, the appropriateness of low energy X ray can be caused to decay, and can there is very large departing from the power spectrum of so final generation and the power spectrum of requirement.
(2) ionization chamber is as the equipment of long term monitoring X ray output dose, must have a stable sensitive volume, possess uniform Electric Field Distribution in this sensitive volume inside.Meanwhile, in order to ensure within the scope of monitored dose rate, this sensitive volume again can not be too small, to ensure enough large sensitivity.
(3) monitor ionization chamber is as Transfer Standards equipment, and what electric leakage will be enough is little, and then ensures its long-time stability and measuring repeatability.
Conventional monitor ionization chamber ensures stable sensitive volume structure by the hardness of high-pressure stage self, and its center collector is clipped in 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 realizes by double layer of metal pole plate, if metal level self is unstable, then 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 greatly, surface leakage is as easy as rolling off a log is subject to the impact of extraneous temperature and humidity conditions for collector and supporting construction surface of contact; (3) entrance window is blocked up, can not meet and not change under the prerequisite of lower energy photon power spectrum the requirement that its input dosage is monitored as far as possible.
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 being suitable for low energy X ray and measuring, this ionization chamber can be used for low energy X ray measure and sensitive volume stablize, leak electricity little.
(2) technical scheme
In order to solve the problem, the present invention is achieved by the following technical solutions:
A kind of transmission-type monitor ionization chamber being suitable for low energy X ray and measuring, this ionization chamber comprises supporting construction, insulation sleeve, support ring, insulated column, collector, high-pressure stage, key is, this ionization chamber is three layers of electrode structure, i.e. two high-pressure stages and a collector; The center of ionization chamber is equipped with the support ring of solidification sensitive volume.
The material of described support ring is copper; Described insulated column is three insulation columns, and material is teflon; Described collector and the material of high-pressure stage are aluminated polyester film, and its thickness is 1 ~ 10 μm; Supporting construction and insulation sleeve are threaded connection.
(3) beneficial effect
The beneficial effect adopting ionization chamber provided by the invention to have is: (1) can meet the Radiation monitoring of lower energy photon.Adopt aluminized Mylar film as the material of electrode, thickness is 1 ~ 10 μm, can be used for the Radiation monitoring of below 30keV energy photon; (2) sensitive volume is fixed.Adopt copper ring to be the support ring of sensitive volume, the sensitive volume of ionization chamber is fixed; (3) ionization chamber electric leakage is effectively reduced.Adopt three insulation columns by collector and external isolation, farthest decrease contact area, decrease electric leakage.
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 insulate column schematic diagram.
Embodiment
Below in conjunction with specification drawings and specific embodiments, the present invention is further elaborated.
A kind of transmission-type monitor ionization chamber being suitable for low energy X ray and measuring, 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 three layers of electrode structure, i.e. two high-pressure stages and a collector; The center of ionization chamber is equipped with the support ring of solidification sensitive volume.
Described supporting construction 1 is monitor ionization chamber external support structure, simultaneously 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 insulate, and the effect of support ring 3 solidifies sensitive volume on the one hand, and another aspect is as the supporting construction of collector 5 and the material of support ring 3 is copper; Described insulated column 4 is insulation three post, and material is teflon, between support ring 3 and collector 5, makes to insulate between the two; Described collector 5 and the material of high-pressure stage 6 are aluminated polyester film, and its thickness is 1 ~ 10 μm, and manufacturing process is the dual way by firmly pressing and adhering to, and is fixed on by polyester film on aluminium sash; Collector 5 is connected with reading and high-pressure system by concentric cable 7 with high-pressure stage 6.
The diameter of ionization chamber used in the present embodiment is 85mm, and the degree of depth is 2cm, and high-pressure stage and collector all adopt thickness to be 6 μm
'saluminated polyester film.
Monitor ionization chamber does not need specifically to provide position dosage, but needs within the scope of be concerned about dose rate, and its ionization current is constant with the ratio of the Air Kerma value of reference position.Like this for different radiation quality, after obtaining this constant, in daily calibration operation, just can be obtained the conventional true value of each calibrating position by the value of each reading monitor ionization chamber.Within the scope of 52 μ Gy/min ~ 4163 μ Gy/min, operating voltage is+200V, measures the ratio of ionization chamber ionization current and 1m place air kerma 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 ratio of the Air Kerma value of its ionization current and reference point locations changes and is less than 0.2%, can be considered constant, meets Dose standard requirement.
Claims (2)
1. the transmission-type monitor ionization chamber being suitable for low energy X ray and measuring, 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 three layers of electrode structure, i.e. two high-pressure stages and a collector; The center of ionization chamber is equipped with the support ring of solidification sensitive volume; The material of support ring (3) is copper; The material of collector (5) and high-pressure stage (6) is aluminated polyester film, and its thickness is 1 ~ 10 μm; Insulation sleeve (2) is equipped with between described supporting construction (1) and support ring (3); Insulated column (4) is positioned between support ring (3) and collector (5); Described insulated column (4) is three insulation columns, and material is teflon; Described collector (5) and high-pressure stage (6) are all fixed on aluminium sash.
2. a kind of transmission-type monitor ionization chamber being suitable for low energy X ray and measuring according to claim 1, it is characterized in that, described supporting construction (1) and insulation sleeve (2) are threaded connection.
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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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| CN103472475B true CN103472475B (en) | 2015-09-30 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| 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 |
| CN110261883B (en) * | 2019-06-27 | 2021-03-16 | 上海联影医疗科技股份有限公司 | Dose monitoring device and radiotherapy device |
| CN113703028A (en) * | 2021-09-20 | 2021-11-26 | 中国计量科学研究院 | Medical accelerator monitoring ionization chamber |
Citations (3)
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|---|---|---|---|---|
| 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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| JP2004212318A (en) * | 2003-01-08 | 2004-07-29 | Shimadzu Corp | X-ray exposure dosemeter |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Non-Patent Citations (1)
| Title |
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| X射线电离室的研制;安继刚等;《冶金自动化》;19791028;第9页左栏；第11页左栏第一段，右栏第一段；第7页右栏第3行；图7 * |
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