CN86209740U - High voltage ionization chamber with energy compensation - Google Patents
High voltage ionization chamber with energy compensation Download PDFInfo
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- CN86209740U CN86209740U CN 86209740 CN86209740U CN86209740U CN 86209740 U CN86209740 U CN 86209740U CN 86209740 CN86209740 CN 86209740 CN 86209740 U CN86209740 U CN 86209740U CN 86209740 U CN86209740 U CN 86209740U
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Abstract
The utility model relates to a high voltage ionization chamber with energy compensation which can measure the exposure rate of the environmental radiation. The high voltage ionization chamber with energy compensation can compensate energy by filtration measures. The experimental selection and the theory estimation can solve the perfect shield coefficient to completely improve the energy response characteristic of a high voltage ionization chamber. The proportion between the maximum of a response curve to the response value of 1000 KeV is settled as 1.17. The energy response approximately ranges from 50 KeV to 1250 KeV. The shield of a filter does not cause directional influence, which is of great favour to simplify the standard of the environmental radiation dose and to improve the precision of the environmental radiation dose. The shield of a filter can appropriately respond to the cosmic ray.
Description
The utility model belongs to a kind of high pressure ionization chamber of measurement environment radiation irradiation dose rate.
In environmental radiation was measured, the ionization chamber ［ see the breadboard report of United States Atomic Energy Commission's safe and sanitary HASL(1972) ］ that the steel wall fills the high pressure argon gas had highly sensitive and the good advantage of stability.But, there is the excessive problem of energy response, the energy response performance is one of key index of environmental radiation measuring element design, in order to improve energy response, now be the stainless steel wall of affiliated Environmental Measurements Laboratory (EML) of USDOE by the thickening ionization chamber, the absorption that adds the low energy end with altar ［ is seen Health physics, Vol.44, No.4, P.379(1983) ］.This pure shielding action incurs loss low energy.Its result, the response curve maximal value is 1.84 with ratio (be called for short and can ring ratio) to the response of 1000KeV, the about 60-1250KeV of level ground energy response scope.
The utility model discloses a kind of ionization chamber of energy compensating shaped steel wall pressurising argon gas, adopt the filtration measure to carry out energy compensating, obtain best shielding factor, the characteristic of energy response of high pressure ionization chamber is improved at all through experimental selection and theoretical calculation.
Energy compensating type high pressure ionization chamber is made of a spherical stainless steel shell and a hollow stainless steel bead that is positioned at the shell center.Above-mentioned shell defines the active volume of ionization chamber.Above-mentioned bead is a passive electrode, is fixed in the center, chamber by a thin stainless-steel tube.Signal is drawn through insulator.The indoor high pressure argon gas that fills.
The energy compensating technology is exactly to paste the sheet metal filtrator on the shell of ionization chamber.In order to compensate evenly, obtain good angular response.Sheet metal as filtrator adopts disc or annular.The shielding factor of filtrator is to determine with theoretical calculation by experiment.At first, experiment records the energy response curve of the ionization chamber when not adding shielding, the energy response curve when measuring shielding again.Then, by linear regression analysis, thereby draw the shielding factor that adds.At last again through experimental verification.
Accompanying drawing 1 is the outside drawing of energy compensating type high pressure ionization chamber.Among the figure: ［ 1 ］ is the spherical stainless steel shell, and ［ 2 ］ are the sheet metal filtrator, and ［ 3 ］ are electrometer.
Accompanying drawing 2 adds compensation and the energy response curve that does not add compensation for the high pressure ionization chamber.
A specific embodiments of the present utility model is recited in down: spherical stainless steel shell and adopt the stainless steel of 1Cr9Ni18Ti as the material of the hollow stainless steel bead of passive electrode.The thickness of spherical stainless steel shell is 1.5mm, and diameter is 203mm.The thickness of hollow stainless steel bead is 0.5mm, and diameter is 50mm, is that the thin stainless-steel tube of 5mm is fixed in the center, chamber with diameter.The volume of ionization chamber is 4.16 liters, fills 20atm(STP) high-purity argon gas.Passive electrode is drawn through three ceramet insulators.Filter is attached on the outer wall of ionization chamber, and filter is circular tin sheet, and its thickness is 1.8mm, pastes 32 altogether, and wherein diameter is have 12 of 50mm, and diameter is have 20 of 60mm.Shielding factor is 67%.
Through measuring, the ratio that can ring of ionization chamber is 1.17, and level ground energy response scope is about 50-1250KeV.And the ionization chamber after measuring the proof shielding do not cause beam-shaping effect, and measurement result is tabulated in down:
Angle 0 15 30 45 60 75 90
Relative response 1.000 1.008 1.003 0.994 0.996 1.003 1.000
Advantage of the present utility model mainly is to adopt the method for filtration that the high pressure ionization chamber is carried out energy compensating, can response characteristic be fundamentally improved. Accompanying drawing 2 shown ionisation chambers add the comparison of compensation and uncompensated energy response curve, have clearly shown this advantage. In order to further specify this problem, Health Physics ［ sees in the high pressure ionization chamber of the high voltage ionization chamber with energy compensation of enumerating with above-described embodiment and U.S. environment measuring chamber (EML) development, Vol.44, No.4, P.379(1983) ］, Yue Qing space etc. ［ is seen by the high pressure ionization chamber of China's atom the subject of knowledge and the object of knowledge, " radiation protection ", the for the first time seminar paper a collection of selected materials of China radiation protection association of nuclear association, the 73rd page, (1982) ］ and the high pressure ionization chamber of China North China radiation protection research institute ［ see the fourth mores, " nuclear defence " first phase, 11(1980) ］ characteristic to ionisation chamber comparatively comprehensively compares, and sees Table 1.
The better energy response that high voltage ionization chamber with energy compensation is shown, this simplification standard and raising degree of accuracy to environmental radiation dose will play an important role, and especially cosmic ray be had suitable response.
Claims (4)
1, a kind of energy compensating type high pressure ionization chamber constitutes the genus filtrator of gilding on the spherical stainless steel shell that is characterised in that of the present utility model by a spherical stainless steel shell and the hollow stainless steel bead as passive electrode that is positioned at the shell center.
2, high pressure ionization chamber according to claim 1 is characterized in that the sheet metal of described filtrator is attached on the outer wall of spherical stainless steel shell.
3, high pressure ionization chamber according to claim 1 and 2 is characterized in that the sheet metal of described filtrator adopts disc or annular.
4, high pressure ionization chamber according to claim 3 is characterized in that the sheet metal of described filtrator adopts the tin sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86209740 CN86209740U (en) | 1986-12-06 | 1986-12-06 | High voltage ionization chamber with energy compensation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 86209740 CN86209740U (en) | 1986-12-06 | 1986-12-06 | High voltage ionization chamber with energy compensation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN86209740U true CN86209740U (en) | 1987-09-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 86209740 Expired - Lifetime CN86209740U (en) | 1986-12-06 | 1986-12-06 | High voltage ionization chamber with energy compensation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN86209740U (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101149438B (en) * | 2007-09-26 | 2010-10-13 | 中国工程物理研究院核物理与化学研究所 | Tritium-measuring method and equipment |
| CN101526622B (en) * | 2008-03-05 | 2012-03-28 | 清华大学 | Detector device used for radiation monitoring |
| CN102955165A (en) * | 2011-08-19 | 2013-03-06 | 中国辐射防护研究院 | Method for compensating X and gamma energy response of ionization chamber by aluminum material |
| CN102955166A (en) * | 2011-08-19 | 2013-03-06 | 中国辐射防护研究院 | Method for ionization chamber X, gamma energy response compensation by using titanium material |
| CN103185892A (en) * | 2011-12-29 | 2013-07-03 | 中国辐射防护研究院 | Method for ionization chamber X and gamma energy response compensation through nylon material |
| CN104319222A (en) * | 2014-10-29 | 2015-01-28 | 中国原子能科学研究院 | Standard high-pressure ionization chamber and manufacturing method thereof |
| CN107576979A (en) * | 2017-09-01 | 2018-01-12 | 山东省计量科学研究院 | A kind of close rate range simulates expanding unit |
| CN108562931A (en) * | 2018-02-02 | 2018-09-21 | 中国原子能科学研究院 | A kind of energy compensating type Neutron Ambient Dose Equivalent secondary standard ionisation chamber |
-
1986
- 1986-12-06 CN CN 86209740 patent/CN86209740U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101149438B (en) * | 2007-09-26 | 2010-10-13 | 中国工程物理研究院核物理与化学研究所 | Tritium-measuring method and equipment |
| CN101526622B (en) * | 2008-03-05 | 2012-03-28 | 清华大学 | Detector device used for radiation monitoring |
| CN102955165A (en) * | 2011-08-19 | 2013-03-06 | 中国辐射防护研究院 | Method for compensating X and gamma energy response of ionization chamber by aluminum material |
| CN102955166A (en) * | 2011-08-19 | 2013-03-06 | 中国辐射防护研究院 | Method for ionization chamber X, gamma energy response compensation by using titanium material |
| CN103185892A (en) * | 2011-12-29 | 2013-07-03 | 中国辐射防护研究院 | Method for ionization chamber X and gamma energy response compensation through nylon material |
| CN103185892B (en) * | 2011-12-29 | 2016-06-29 | 中国辐射防护研究院 | Utilize the method that nylon material carries out ionization chamber X, gamma energy response compensates |
| CN104319222A (en) * | 2014-10-29 | 2015-01-28 | 中国原子能科学研究院 | Standard high-pressure ionization chamber and manufacturing method thereof |
| CN107576979A (en) * | 2017-09-01 | 2018-01-12 | 山东省计量科学研究院 | A kind of close rate range simulates expanding unit |
| CN107576979B (en) * | 2017-09-01 | 2024-04-12 | 山东省计量科学研究院 | Dose rate range simulation expanding device |
| CN108562931A (en) * | 2018-02-02 | 2018-09-21 | 中国原子能科学研究院 | A kind of energy compensating type Neutron Ambient Dose Equivalent secondary standard ionisation chamber |
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| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |