CN203415539U - Ionization chamber - Google Patents
Ionization chamber Download PDFInfo
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- CN203415539U CN203415539U CN201320503590.0U CN201320503590U CN203415539U CN 203415539 U CN203415539 U CN 203415539U CN 201320503590 U CN201320503590 U CN 201320503590U CN 203415539 U CN203415539 U CN 203415539U
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- Prior art keywords
- ionization chamber
- electrode
- graphite head
- reduced
- graphite
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- Electron Tubes For Measurement (AREA)
Abstract
The utility model relates to an ionization chamber comprising a connecting port, a shaft sleeve, an insulating material, an electrode, an ionization chamber central cavity and a graphite head. The ionization chamber has a cylindrical shape. Length L of the shape of the ionization chamber is from 45 to 54mm, and the external diameter is from 8 to 12mm. The top end of the graphite head has a semispherical shape, and the internal diameter d of the semispherical shape is from 5 to 7.5mm. The right end of the electrode is arranged in the spherical center of the semispherical shape. The beneficial effects of the ionization chamber are that: size of the ionization chamber is reduced from 6.6cm3 to 3.8cm3. A shadow region generated in the ionization chamber during scanning is reduced and accuracy of measurement data is enhanced. The top end of the graphite head has the semispherical shape so that signals can be uniformly received, and receiving is not influenced by variation of direction of the ionization chamber. Therefore, after one time of clamping, errors of measurement of symmetry on AB direction and JT direction, and uniformity and smoothness are reduced. Besides, size of sensitive air is reduced from a range of 0.2 to 0.6cm3 to 0.1cm3 so that the ionization chamber is more accurate in measurement symmetry and uniformity.
Description
Technical field
The utility model relates to Ionizing Radiation field, is specifically related to a kind of ionization chamber.
Background technology
Ionization chamber is a kind of gas detector of detecting ionizing radiation, the equipment of measuring electromagnetic radiation, particle flux intensity or charged particle energy, by the electrode in different potentials be limited to the gas composition between electrode, by collect electric signal that the electronics that produces because of radiation or ion motion produce in gas, carry out the detector of quantitative measurment ionising radiation.At present, the overall dimension of ionization chamber is mostly diameter 16mm, length 61.9mm, and volume is about 6.6cm
3left and right.In general, the air quality in ionization chamber is depended in the sensitivity of ionization chamber, because the air pressure in ionization chamber is approximately an atmospheric pressure, so, also can say that its sensitivity is proportional to volume of air, thereby this volume claims again " sensitive volume of air ".The sensitive volume of air majority of the domestic ionization chamber for detection of performances such as the well-balanced degree of linear accelerator, symmetry is at 0.2-0.6cm
3between, and sensitive volume is too large, it detects well-balanced degree, symmetry time error is larger.And when the sensitive volume diameter of axle is larger, when it scans for 3 d water tank, can only guarantee that orientation measurement data are accurate, therefore affect the accuracy of other direction.In addition, original graphite head end shape is thimble type, makes the distance between electrode and receiving pole uneven, and when ionization chamber direction changes, the signal that receiving pole is received will be inhomogeneous.
Utility model content
In order to improve the accuracy of measurement data, reduce the sensitive volume of air of ionization chamber, reduce sensitive air diameter of axle ratio and the overall volume of ionization chamber simultaneously, it is 0.1cm that the purpose of this utility model is to provide a kind of sensitive volume
3ionization chamber, to overcome above-mentioned deficiency.
The purpose of this utility model is to be achieved through the following technical solutions:
A kind of ionization chamber, comprise Wiring port, axle sleeve, insulating material, electrode, ionization chamber central cavity and graphite head, described ionization chamber is cylindrical, ionization chamber contour length L is 45-54mm, D outer diameter is 8-12mm, described graphite head top is hemisphere, and hemispheric inner diameter d is 5-7.5mm, and the right-hand member of described electrode is positioned at hemispheric centre of sphere place.
Further, the inwall of described graphite head is graphite wall.
Preferably, the L of described ionization chamber is 49.5mm, and D is 10.2mm, and volume is 3.8cm
3.
Preferably, described d is 6.25mm.The volume of described ionization chamber central cavity is 0.1cm
3.
Preferably, described graphite head is arranged with tarpaulin outward.
The beneficial effects of the utility model: this ionization chamber is simple in structure, are easy to make; By the volume of ionization chamber by 6.6cm
3be reduced to 3.8cm
3, the shadow region that during scanning, ionization chamber produces reduces; Ionization chamber overall volume diminishes, and improves the accuracy of measurement data; Graphite head top after improvement is hemisphere, the distance of assembling rear electrode and hemisphere inwall is certain, and acknowledge(ment) signal is even, thereby absorbed dose is more even, the impact that not changed by ionization chamber direction, therefore measure the symmetry of AB direction, JT direction, all smooth degree error is little after clamped one time; Sensitive volume of air (being ionization chamber central cavity volume) is by 0.2-0.6cm
3be reduced to 0.1cm
3, it measures symmetry, well-balanced degree is more accurate.
Accompanying drawing explanation
With reference to the accompanying drawings the utility model is described in further detail below.
Fig. 1 is the stereogram of the ionization chamber described in the utility model embodiment;
Fig. 2 is the profile of the ionization chamber described in the utility model embodiment.
In figure:
1, Wiring port; 2, axle sleeve; 3, insulating material; 4, electrode; 5, ionization chamber central cavity; 6, graphite head; 7, tarpaulin.
Embodiment
As shown in Figure 1-2, a kind of ionization chamber described in the utility model embodiment, comprise Wiring port 1, axle sleeve 2, insulating material 3, electrode 4, ionization chamber central cavity 5 and graphite head 6, described ionization chamber is cylindrical, the contour length L of ionization chamber is 45-54mm, and D outer diameter is 8-12mm, and described graphite head 6 tops are hemisphere, hemispheric inner diameter d is 5-7.5mm, and the right-hand member of described electrode 4 is positioned at hemispheric centre of sphere place; The L of described ionization chamber is 49.5mm, and D is 10.2mm, and volume is 3.8cm
3; Described d is 6.25mm; The volume of described ionization chamber central cavity 3 is 0.1cm
3; The inwall of described graphite head 6 is graphite wall; The outer tarpaulin 7 that is arranged with of described graphite head 6.
During concrete enforcement, when ionization chamber is subject to radiation exposure, the molecular action in ray and gas, produces by an electronics and an ion pair that cation forms.These ions are region free diffusing towards periphery.In diffusion process, electronics and cation can compoundly form neutral molecule again.But if forming the polarizing voltage V that adds direct current in the electrode 4 of ionization chamber and graphite wall, form electric field, electronics and cation will be pulled to respectively positive and negative polarities so, and are collected.Along with polarizing voltage, V increases gradually, and the operating state of ionization chamber will be from recombination region, saturation region, proportional region, region of limited proportionality, Geiger region (G-M district) change to continuous discharge district always.
When X ray, radiation gamma ionization chamber, photon and ionization chamber material interact, mainly in the graphite wall of ionization chamber, produce secondary electron, secondary electron makes the air ionization in ionization chamber, ionization ion under the effect of electric field to electrode movement, the ion that arrives electrode 4 is collected, and forms ionization current signal and exports to measuring unit.
The utility model is not limited to above-mentioned preferred forms; anyone can draw other various forms of products under enlightenment of the present utility model; no matter but do any variation in its shape or structure; every have identical with a application or akin technical scheme, within all dropping on protection range of the present utility model.
Claims (5)
1. an ionization chamber, comprise Wiring port (1), axle sleeve (2), insulating material (3), electrode (4), ionization chamber central cavity (5) and graphite head (6), it is characterized in that: described ionization chamber is cylindrical, the contour length L of ionization chamber is 45-54mm, D outer diameter is 8-12mm, described graphite head (6) top is hemisphere, and hemispheric inner diameter d is 5-7.5mm, and the right-hand member of described electrode (4) is positioned at hemispheric centre of sphere place.
2. ionization chamber according to claim 1, is characterized in that: the contour length L of described ionization chamber is 49.5mm, and D outer diameter is 10.2mm.
3. ionization chamber according to claim 2, is characterized in that: described hemispheric inner diameter d is 6.25mm.
4. ionization chamber according to claim 1 and 2, is characterized in that: the inwall of described graphite head (6) is graphite wall.
5. ionization chamber according to claim 1 and 2, is characterized in that: the outer tarpaulin (7) that is arranged with of described graphite head (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320503590.0U CN203415539U (en) | 2013-08-19 | 2013-08-19 | Ionization chamber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320503590.0U CN203415539U (en) | 2013-08-19 | 2013-08-19 | Ionization chamber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203415539U true CN203415539U (en) | 2014-01-29 |
Family
ID=49978410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320503590.0U Expired - Lifetime CN203415539U (en) | 2013-08-19 | 2013-08-19 | Ionization chamber |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203415539U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104934285A (en) * | 2015-07-03 | 2015-09-23 | 中国计量科学研究院 | An ionization chamber measuring volume adjusting device |
| CN106449347A (en) * | 2016-10-28 | 2017-02-22 | 中国计量科学研究院 | Ionization chamber device |
| CN108183060A (en) * | 2017-12-14 | 2018-06-19 | 中国计量科学研究院 | A kind of ionisation chamber for radiation dose monitoring |
-
2013
- 2013-08-19 CN CN201320503590.0U patent/CN203415539U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104934285A (en) * | 2015-07-03 | 2015-09-23 | 中国计量科学研究院 | An ionization chamber measuring volume adjusting device |
| CN106449347A (en) * | 2016-10-28 | 2017-02-22 | 中国计量科学研究院 | Ionization chamber device |
| CN108183060A (en) * | 2017-12-14 | 2018-06-19 | 中国计量科学研究院 | A kind of ionisation chamber for radiation dose monitoring |
| CN108183060B (en) * | 2017-12-14 | 2019-07-23 | 中国计量科学研究院 | A kind of ionisation chamber for radiation dose monitoring |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140129 |
|
| CX01 | Expiry of patent term |