CN2869886Y - Pen-like inization chamber for CI index measuring - Google Patents
Pen-like inization chamber for CI index measuring Download PDFInfo
- Publication number
- CN2869886Y CN2869886Y CN 200520036437 CN200520036437U CN2869886Y CN 2869886 Y CN2869886 Y CN 2869886Y CN 200520036437 CN200520036437 CN 200520036437 CN 200520036437 U CN200520036437 U CN 200520036437U CN 2869886 Y CN2869886 Y CN 2869886Y
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- ionization chamber
- collector
- pressure stage
- utility
- model
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Abstract
The utility model discloses a tubular-shaped ionization chamber for CT index measurement, an insulation cap (5) is embedded tightly between the front ends of high voltage electrode (3) and collector (4). The utility model can ensure collector is fixed on the center shaft of ionization chamber so that the generated electric field is distributed symmetrically along the center shaft of ionization chamber, and the utility model has the advantages of high test sensitivity, good energy response and good stability. Additionally the utility model is firm and endurable.
Description
Affiliated technical field
The utility model relates to a kind of ionization chamber, relates in particular to a kind of pen type ionization chamber of the CT of being used for index measurement.
Background technology
In the calibration of CT scan machine detects, dosage, dose rate, repeatability, CTDI value (computed tomography dosage index) that the X ray that needs measurement CT machine (computed tomography) to discharge produces.Usually test with the ionization chamber detector, and require this detector high sensitivity, wide energy response, high stability, big sensitive volume.The pen type ionization chamber of the existing CT of being used for index measurement is a column construction, and column wall is fixed with high-pressure stage (negative electrode), and the central shaft position of sound production of post has tinsel collector (anode), is full of air between collector and high-pressure stage.During work,, on high-pressure stage, add high pressure, make and produce an electric field between ionization chamber high-pressure stage and the collector by external high-tension cable.During test, have only this electric field to form rotational symmetry along central shaft, could guarantee the high sensitivity measured and test accurately.The existing pen type ionization chamber that is used for the CT index measurement, collector generally is tinsel (as an aluminium), because it is flexible more again, and only fix in the rear end at ionization chamber middle part, and its front end does not carry out any fixing, therefore collector is yielding in use, also easily produce the change of position, the off-center axle makes the electric field of generation asymmetric along the central shaft space distribution, influences the test performance of ionization chamber.The graphite that high-pressure stage also adopts usually, the graphite fragility is big, and difficulty of processing is big, and inconvenience is deposited.
Summary of the invention
The purpose of this utility model just provides a kind of pen type ionization chamber of the CT of being used for index measurement, this ionization chamber can guarantee that collector is fixed on the central axis of ionization chamber, the electric field of generation is symmetrically distributed along the ionization chamber central axis, the test highly sensitive, energy response good, good stability, and is sturdy and durable.
The utility model solves its technical matters, the technical scheme that is adopted is: a kind of pen type ionization chamber of the CT of being used for index measurement, comprise that the rear end is fixed on the ring-type high-pressure stage between ionization chamber middle part overcoat and the dead ring, and the rear end is fixed on the tinsel collector in the same dead ring, and its design feature is: closely be embedded with the overhang insulation cap between high-pressure stage and the collector front end.
Compared with prior art, the beneficial effect of the technical solution of the utility model is: the overhang insulation cap closely embeds the front end of high-pressure stage and collector, the front end of collector is fixed in the overhang insulation cap, thereby two ends of collector all are fixed, and guarantee that collector is fixed on the central axis of ionization chamber reliably.In use, guarantee that collector can not produce the change of position, skew, the electric field of generation forms rotational symmetry along the central axis of ionization chamber, guarantees measurement sensitivity height, good, the good stability of energy response.Experiment shows that the accessible index of the utility model is: ray energy scope: 50～150kV, sensitivity: 1 * 10
-9C/R, energy response: ± 3.5%, long-time stability:＜1%.
Above-mentioned high-pressure stage front end and overhang insulation cap pass through screw retention.
Above-mentioned high-pressure stage front end and overhang insulation cap are connected and fixed threadably.
Like this by screw or engage thread, than simple tight embedding, can make between overhang insulation cap and the high-pressure stage front end fix more reliable, firm.
Above-mentioned collector and high-pressure stage are made by the conduction fluoroplastic.
Collector adopts the conduction fluoroplastic, and its hardness is greater than existing metallic aluminium, so not yielding, sturdy and durable in the use, and easy to process; Equally, high-pressure stage also adopts the conduction fluoroplastic, the graphite of prior art relatively, it is easy to shape, and good toughness, be difficult for crisp, durable, good reliability.
The utility model will be further described below in conjunction with the drawings and specific embodiments.
Description of drawings
Accompanying drawing is the sectional structure synoptic diagram of the utility model embodiment one.
Embodiment
Embodiment one
Accompanying drawing illustrates, a kind of embodiment of the present utility model is: a kind of pen type ionization chamber that is used for the CT index measurement, comprise that the rear end is fixed on the ring-type high-pressure stage 3 between ionization chamber middle part overcoat 1 and the dead ring 2, and the rear end is fixed on the tinsel collector 4 in the same dead ring 2, the overhang insulation cap 5 that closely is embedded with between high-pressure stage 3 and collector 4 front ends.High-pressure stage 3 front ends and overhang insulation cap 5 are fixing by screw 6.Collector 4 and high-pressure stage 3 are made by the conduction fluoroplastic.
Embodiment two
Present embodiment and embodiment one are basic identical, and different is: high-pressure stage 3 front ends and overhang insulation cap 5 are connected and fixed threadably.Also be that high-pressure stage 3 front ends have internal thread, on the overhang insulation cap 5 external thread arranged, screw embedding mutually threadably and connect.
Embodiment three
Present embodiment and embodiment one are basic identical, and different is: merely adopt tight chimeric mode to connect between high-pressure stage 3 front ends and the overhang insulation cap 5, and do not fixed by screw.
Claims (4)
1, a kind of pen type ionization chamber that is used for the CT index measurement, comprise that the rear end is fixed on the ring-type high-pressure stage (3) between ionization chamber middle part overcoat (1) and the dead ring (2), and the rear end is fixed on the tinsel collector (4) in the same dead ring (2), it is characterized in that: closely be embedded with overhang insulation cap (5) between described high-pressure stage (3) and collector (4) front end.
2, a kind of pen type ionization chamber that is used for the CT index measurement as claimed in claim 1 is characterized in that: described high-pressure stage (3) front end and overhang insulation cap (5) are fixing by screw (6).
3, a kind of pen type ionization chamber that is used for the CT index measurement as claimed in claim 1, it is characterized in that: described high-pressure stage (3) front end and overhang insulation cap (5) are connected and fixed threadably.
4, a kind of pen type ionization chamber that is used for the CT index measurement as claimed in claim 1 is characterized in that: described collector (4) and high-pressure stage (3) are made by the conduction fluoroplastic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520036437 CN2869886Y (en) | 2005-12-09 | 2005-12-09 | Pen-like inization chamber for CI index measuring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520036437 CN2869886Y (en) | 2005-12-09 | 2005-12-09 | Pen-like inization chamber for CI index measuring |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2869886Y true CN2869886Y (en) | 2007-02-14 |
Family
ID=37724827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520036437 Expired - Lifetime CN2869886Y (en) | 2005-12-09 | 2005-12-09 | Pen-like inization chamber for CI index measuring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2869886Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104637771A (en) * | 2015-02-09 | 2015-05-20 | 中测测试科技有限公司 | Ionization chamber |
| CN106653553A (en) * | 2017-03-06 | 2017-05-10 | 山东中测校准质控技术有限公司 | X-ray cylindrical protective ionization chamber with double collectors |
-
2005
- 2005-12-09 CN CN 200520036437 patent/CN2869886Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104637771A (en) * | 2015-02-09 | 2015-05-20 | 中测测试科技有限公司 | Ionization chamber |
| CN106653553A (en) * | 2017-03-06 | 2017-05-10 | 山东中测校准质控技术有限公司 | X-ray cylindrical protective ionization chamber with double collectors |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: ZHONGCE TESTING CO., LTD. Free format text: FORMER OWNER: IONIZATION-RADIATION INST., CHINESE DETECTION TECHNOLOGY ACADEMY Effective date: 20080530 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20080530 Address after: Sichuan city of Chengdu province Yushuang Road No. 10, zip code: 610021 Patentee after: Zhongce Test Co.,Ltd. Address before: Sichuan city of Chengdu province Yushuang Road No. 10, zip code: 610021 Patentee before: Ionizing Radiation Institute of China National Test |
|
| CX01 | Expiry of patent term |
Granted publication date: 20070214 |
|
| EXPY | Termination of patent right or utility model |