TWI434313B - Spherical polarity air ionization chamber - Google Patents
Spherical polarity air ionization chamber Download PDFInfo
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- TWI434313B TWI434313B TW99136916A TW99136916A TWI434313B TW I434313 B TWI434313 B TW I434313B TW 99136916 A TW99136916 A TW 99136916A TW 99136916 A TW99136916 A TW 99136916A TW I434313 B TWI434313 B TW I434313B
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- 229910052751 metal Inorganic materials 0.000 claims description 52
- 239000002184 metal Substances 0.000 claims description 52
- 239000004020 conductor Substances 0.000 claims description 15
- 230000001012 protector Effects 0.000 claims description 13
- 230000005855 radiation Effects 0.000 claims description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 12
- 238000009413 insulation Methods 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 239000010949 copper Substances 0.000 claims description 6
- 229910002804 graphite Inorganic materials 0.000 claims description 6
- 239000010439 graphite Substances 0.000 claims description 6
- 239000011810 insulating material Substances 0.000 claims description 6
- 229910052742 iron Inorganic materials 0.000 claims description 6
- 239000004033 plastic Substances 0.000 claims description 6
- 229930040373 Paraformaldehyde Natural products 0.000 claims description 4
- 239000004809 Teflon Substances 0.000 claims description 4
- 229920006362 Teflon® Polymers 0.000 claims description 4
- 150000002500 ions Chemical class 0.000 claims description 4
- -1 polyoxymethylene Polymers 0.000 claims description 4
- 229920006324 polyoxymethylene Polymers 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 claims description 2
- 239000007772 electrode material Substances 0.000 claims 1
- 238000005259 measurement Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 3
- 230000005684 electric field Effects 0.000 description 2
- 239000010408 film Substances 0.000 description 2
- 230000035755 proliferation Effects 0.000 description 2
- GUTLYIVDDKVIGB-OUBTZVSYSA-N Cobalt-60 Chemical compound [60Co] GUTLYIVDDKVIGB-OUBTZVSYSA-N 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
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- Measurement Of Radiation (AREA)
Description
一種球形電極空氣游離腔，應用於輻射劑量標準實驗室，作為國家實驗室或二級校正實驗室之量測標準，並可作為X-光機、加馬照射裝備及直線加速器等裝置輸出輻射劑量之量測，其可在靈敏體積內產生均勻之電場強度，避免於收集飽和電流時必須升高工作電壓，增加漏電流，而影響量測準確度及損壞儀器。A spherical electrode air free cavity is applied to a radiation dose standard laboratory as a measurement standard of a national laboratory or a secondary calibration laboratory, and can be used as an X-ray machine, a horse-horse irradiation equipment, and a linear accelerator to output a radiation dose. The measurement can generate a uniform electric field intensity in a sensitive volume, avoiding the need to raise the working voltage when collecting the saturation current, increase the leakage current, and affect the measurement accuracy and damage the instrument.
空氣游離腔(air ionization chamber)普遍應用在輻射照射設備之劑量輸出量測，如：X光機、鈷-60治療機、直線加速器等，藉以了解輻射照射設備之輸出劑量是否正確。The air ionization chamber is commonly used in the dose output measurement of radiation irradiation equipment, such as X-ray machine, cobalt-60 treatment machine, linear accelerator, etc., to understand whether the output dose of the radiation irradiation equipment is correct.
為了使游離腔有最大的量測電流輸出，以及有最小的量測信號損失，以增進信號量測之準確度，良好之游離腔應具備有下列特性：(1)有良好的長期穩定性；(2)有良好的再現性；(3)漏電流小；(4)能量依持性低；(5)離子再結合少；(6)量測不受方向影響。。In order to make the free cavity have the largest measured current output and the smallest measurement signal loss to improve the accuracy of signal measurement, a good free cavity should have the following characteristics: (1) good long-term stability; (2) good reproducibility; (3) low leakage current; (4) low energy dependence; (5) less ion recombination; (6) measurement is not affected by direction. .
目前市售之球形或圓柱形空氣游離腔所使用之電極為棒狀，容易造成腔內電場均勻度不佳，使腔內角落區域之信號漏失，而當游離腔體積增加時，為收集飽和電流時，必須使用較高之工作電壓，但電壓過高時會產生氣體增殖現象，而易形成漏電流，降低量測訊號之準確度，不能達到良好游離腔之特性。The electrodes used in the commercially available spherical or cylindrical air free cavity are rod-shaped, which tends to cause poor uniformity of the electric field in the cavity, and the signal in the corner region of the cavity is lost, and when the free cavity volume is increased, the saturation current is collected. When a higher operating voltage must be used, when the voltage is too high, gas proliferation occurs, and leakage current is easily formed, and the accuracy of the measurement signal is lowered, and the characteristics of a good free cavity cannot be achieved.
本發明係有關於一種游離腔，尤指一種能作全腔體信號收集，避免腔體內離子信號漏失，並使用較低之工作電壓即可收集到飽和電流，不會產生氣體增殖現象且可降低漏電流，讓量測結果更為精準之球形電極空氣游離腔。The invention relates to an free cavity, in particular to a signal collection of a full cavity, avoiding leakage of ion signals in the cavity, and collecting a saturated current using a lower operating voltage, which does not cause gas proliferation and can be reduced. The leakage current makes the measurement result more accurate and the spherical electrode air free cavity.
在一實施例中，本發明提出一種球型電極空氣游離腔，其包含有：一腔體，其係為一球型中空體之結構，其腔壁上有一開口，該開口上向外凸有一外電極基座，其內側安裝有一金屬環，該金屬環之內側安裝有一絕緣環，該絕緣環之內側安裝有一金屬護極，該金屬護極之內側安裝有一內電極絕緣固定座，其中該金屬環係為一導電材料，該絕緣環係為一絕緣材料，該金屬護極係為一導電材料，該內電極絕緣固定座係為一絕緣材料，該腔體之材料可為塑膠或石墨等，其厚度依達到電子平衡條件而決定之；一外電極，並與該金屬環相連接，其係為一導電材料；以及一內電極，其係為一中空球體結構，位於外電極內，其外表面有一導電材料形成之薄膜，且向外凸伸有一金屬支撐桿，該內電極藉由該金屬支撐桿插入該內電極絕緣固定座，並與該金屬護極、該絕緣環及該金屬環共同固定於該外電極基座，其中該金屬支撐桿係為一導電材料，該內電極之材料可為塑膠或石墨。In one embodiment, the present invention provides a spherical electrode air free cavity, which comprises: a cavity, which is a spherical hollow body structure having an opening in the cavity wall, the opening having an outward convex shape The outer electrode base has a metal ring mounted on the inner side thereof, and an inner side of the metal ring is mounted with an insulating ring, a metal protector is mounted on the inner side of the insulating ring, and an inner electrode insulating fixed seat is mounted on the inner side of the metal protector, wherein the metal The ring system is a conductive material, the insulating ring is an insulating material, the metal protector is a conductive material, the inner electrode insulating fixed seat is an insulating material, and the material of the cavity can be plastic or graphite. The thickness is determined according to an electron balance condition; an external electrode is connected to the metal ring as a conductive material; and an internal electrode is a hollow sphere structure located inside the outer electrode and outside The surface has a film formed of a conductive material, and a metal support rod protrudes outwardly, and the inner electrode is inserted into the inner electrode insulation holder by the metal support rod, and the metal protection pole The common ring and the metal ring secured to the outer electrode base, wherein the metal-based support rod is a conductive material, the material of the inner electrode may be made of plastic or graphite.
以下將參照隨附之圖式來描述本發明為達成目的所使用的技術手段與功效，而以下圖式所列舉之實施例僅為輔助說明，以利 貴審查委員瞭解，但本案之技術手段並不限於所列舉圖式。The technical means and efficacy of the present invention for achieving the object will be described below with reference to the accompanying drawings, and the embodiments listed in the following drawings are only for the purpose of explanation, and are to be understood by the reviewing committee, but the technical means of the present invention are not Limited to the listed figures.
再請參閱圖一所示，並請參閱圖二以利理解，一種球形電極空氣游離腔1，其係包含有：一腔體10，其係為一球型中空體之結構，其腔壁上有一開口100，該開口100上向外凸有一外電極基座101，其內側安裝有一金屬環1010，該金屬環1010之內側安裝有一絕緣環1011，該絕緣環1011之內側安裝有一金屬護極1012，該金屬護極1012之內側安裝有一內電極絕緣固定座1013，其中該金屬環1010係為一導電材料如：鋁或銅或鐵或其組合其中之一，該絕緣環1011係為一絕緣材料如：鐵弗龍，該金屬護極1012係為一導電材料如：鋁或銅或鐵或其組合其中之一，該內電極絕緣固定座1013係為一絕緣材料如：鐵弗龍，該腔體10之材料可為塑膠(如：聚甲醛)或石墨等，其厚度依達到電子平衡條件而決定之。Referring to FIG. 1 again, and referring to FIG. 2 for understanding, a spherical electrode air free cavity 1 includes: a cavity 10 which is a spherical hollow body structure on a cavity wall thereof. An opening 100 is formed, and an outer electrode base 101 is protruded from the opening 100. A metal ring 1010 is mounted on the inner side of the metal ring 1010. An inner side of the metal ring 1010 is provided with an insulating ring 1011. A metal guard 1012 is mounted on the inner side of the insulating ring 1011. An inner electrode insulation mount 1013 is mounted on the inner side of the metal protector 1012. The metal ring 1010 is one of a conductive material such as aluminum or copper or iron or a combination thereof. The insulating ring 1011 is an insulating material. For example, Teflon, the metal protector 1012 is one of conductive materials such as aluminum or copper or iron or a combination thereof, and the inner electrode insulating holder 1013 is an insulating material such as: Teflon, the cavity The material of the body 10 may be plastic (such as polyoxymethylene) or graphite, and the thickness thereof is determined according to the electron balance condition.
一外電極11，其係為塗抹於該腔體10內側表面所形成之一薄膜結構，並與該金屬環1010相連接，其係為一導電材料，其厚度達到均勻導電之目的即可。An outer electrode 11 is a thin film structure formed on the inner surface of the cavity 10, and is connected to the metal ring 1010, and is a conductive material whose thickness is uniform for the purpose of conduction.
一內電極12，其係為一中空球體結構，位於外電極內，其外表面有一導電材料形成之薄膜，且向外凸伸有一金屬支撐桿120，該內電極12藉由該金屬支撐桿120插入該內電極絕緣固定座1013，並與該金屬護極1012、該絕緣環1011及該金屬環1010共同將其固定於該外電極基座101，其中該金屬支撐桿120係為一導電材料如：鋁或銅或鐵或其組合其中之一，該內電極12之材料可為塑膠(如：聚甲醛)或石墨等，其係用以收集該腔體10內之游離信號。An inner electrode 12 is a hollow sphere structure, and is disposed in the outer electrode. The outer surface thereof has a film formed of a conductive material, and a metal support rod 120 is protruded outwardly. The inner electrode 12 is supported by the metal support rod 120. The inner electrode insulating holder 1013 is inserted and fixed to the outer electrode base 101 together with the metal protector 1012, the insulating ring 1011 and the metal ring 1010, wherein the metal support rod 120 is a conductive material such as One of aluminum or copper or iron or a combination thereof, the material of the inner electrode 12 may be plastic (such as polyoxymethylene) or graphite, etc., for collecting the free signal in the cavity 10.
其中，該外電極基座101更可連接一腔柄13，以作為固定之用。The outer electrode base 101 can be further connected to a cavity handle 13 for fixing.
再請參閱圖三所示，係為本發明較佳實施例使用狀態示意圖，首先將該球型電極空氣游離腔1之金屬支撐桿120、金屬護極1012、金屬環1010分別連接至一三軸信號線111之一端之中心軸、第二軸、外軸，該三軸信號線111之另一端連接至一具有直流高壓源(V)供應之靜電計2。此外，透過一輻射照射裝置(圖中未視)對該游離腔1進行照射，該輻射照射裝置所發射之游離輻射(R)會使得腔體內空氣產生游離現象，並且藉由該直流高壓源(V)使腔體內之正負離子分離而產生游離電流(I)，並將該游離電流(I)引入該靜電計2之輸入端及充電電容(C)上，則靜電計2之輸出端可得到電壓輸出(Vo)，並藉此判定該輻射照射裝置所發射之游離輻射(R)之強弱。Referring to FIG. 3 again, it is a schematic diagram of the state of use of the preferred embodiment of the present invention. First, the metal support rod 120, the metal protector 1012, and the metal ring 1010 of the spherical electrode air free chamber 1 are respectively connected to a three-axis. The central axis, the second axis, and the outer axis of one end of the signal line 111, the other end of the three-axis signal line 111 is connected to an electrometer 2 having a supply of a DC high voltage source (V). In addition, the free cavity 1 is irradiated through a radiation irradiation device (not shown), and the free radiation (R) emitted by the radiation irradiation device causes the air in the cavity to be free, and by the DC high voltage source ( V) separating the positive and negative ions in the cavity to generate a free current (I), and introducing the free current (I) into the input end of the electrometer 2 and the charging capacitor (C), the output end of the electrometer 2 can be obtained The voltage is output (Vo), and thereby the intensity of the free radiation (R) emitted by the radiation irradiation device is determined.
惟以上所述者，僅為本發明之實施例而已，當不能以之限定本發明所實施之範圍。即大凡依本發明權利要求所作之均等變化與修飾，皆應仍屬於本發明專利涵蓋之範圍內，謹請 貴審查委員明鑑，並祈惠准，是所至禱。However, the above description is only for the embodiments of the present invention, and the scope of the invention is not limited thereto. That is, the equivalent changes and modifications made in accordance with the claims of the present invention should still fall within the scope of the patent of the present invention. I would like to ask your review committee to give a clear understanding and pray for it.
1．．．球型電極空氣游離腔1. . . Spherical electrode air free cavity
10．．．腔體10. . . Cavity
100．．．開口100. . . Opening
101．．．外電極基座101. . . External electrode base
1010．．．金屬環1010. . . metal ring
1011．．．絕緣環1011. . . Insulation ring
1012．．．金屬護極1012. . . Metal guard
1013．．．內電極絕緣固定座1013. . . Inner electrode insulation mount
11．．．外電極11. . . External electrode
12．．．內電極12. . . Internal electrode
120．．．金屬支撐桿120. . . Metal support rod
13．．．腔柄13. . . Chamber handle
111．．．三軸信號線111. . . Triaxial signal line
圖一係為一種球形電極空氣游離腔示意圖Figure 1 is a schematic diagram of a spherical electrode air free cavity
圖二係為內電極示意圖Figure 2 is a schematic diagram of the internal electrode
圖三係為本發明較佳實施例使用狀態示意圖Figure 3 is a schematic view showing the state of use of the preferred embodiment of the present invention.
1．．．球型電極空氣游離腔1. . . Spherical electrode air free cavity
10．．．腔體10. . . Cavity
100．．．開口100. . . Opening
101．．．外電極基座101. . . External electrode base
1010．．．金屬環1010. . . metal ring
1011．．．絕緣環1011. . . Insulation ring
1012．．．金屬護極1012. . . Metal guard
1013．．．內電極絕緣固定座1013. . . Inner electrode insulation mount
11．．．外電極11. . . External electrode
12．．．內電極12. . . Internal electrode
120．．．金屬支撐桿120. . . Metal support rod
13．．．腔柄13. . . Chamber handle
Claims (9)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW99136916A TWI434313B (en) | 2010-10-28 | 2010-10-28 | Spherical polarity air ionization chamber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW99136916A TWI434313B (en) | 2010-10-28 | 2010-10-28 | Spherical polarity air ionization chamber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| TW201218239A TW201218239A (en) | 2012-05-01 |
| TWI434313B true TWI434313B (en) | 2014-04-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| TW99136916A TWI434313B (en) | 2010-10-28 | 2010-10-28 | Spherical polarity air ionization chamber |
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| TW (1) | TWI434313B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI497102B (en) * | 2012-10-31 | 2015-08-21 | Iner Aec Executive Yuan | Ionization chamber with built-in temperature sensor |
| 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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2010
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| Publication number | Publication date |
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| TW201218239A (en) | 2012-05-01 |
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