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Method for compensating X and gamma energy response of ionization chamber by aluminum material

An energy response, ionization chamber technology, applied in the field of ionization chamber design, can solve the problems such as the unsatisfactory effect of tin paste compensation

Inactive Publication Date: 2013-03-06
CHINA INST FOR RADIATION PROTECTION
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Problems solved by technology

And when the gamma ray energy detected by the ionization chamber is above 3MeV, the compensation effect of tin paste is not ideal

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  • Method for compensating X and gamma energy response of ionization chamber by aluminum material
  • Method for compensating X and gamma energy response of ionization chamber by aluminum material

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Embodiment Construction

[0010] The present invention will be described in detail below in conjunction with the accompanying drawings and implementation process.

[0011] The present invention uses aluminum material to flatten the response of the steel ionization chamber to X and gamma radiation in the energy range of 0.08-7.0 MeV, so that it can 137 Within ±30% of Cs response. The ionization chamber collection pole is made of aluminum, and the high-voltage pole is made of stainless steel. There is a stainless steel shielding shell outside the high-voltage pole, and an aluminum lining is set on the inner surface of the stainless steel high-voltage pole, so that the ionization chamber can be well optimized in the energy range of 100-200keV. over-response problem.

[0012] The response of the working gas in the sensitive volume of the ionization chamber to X and γ-rays mainly comes from the contribution of secondary electrons generated by the interaction between the ray and the chamber wall material. ...

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Abstract

The invention relates to designing technology of ionization chambers, in particular to a method for compensating X and gamma energy response of an ionization chamber by an aluminum material. On the premise that a collection electrode in the ionization chamber is made of the aluminum material and a high-voltage electrode is made of a stainless steel material, an aluminum lining layer is arranged on the inner surface of the high-voltage electrode. By adding a certain thickness of the aluminum material on the inner surface of the steel high-voltage electrode, the problem about over response of the steel ionization chamber to X-ray and gamma-ray within the energy range from 100 to 200keV is solved, meanwhile, change of response to the X-ray and gamma-ray with energy higher than 300keV is small, and effect to a response curve of the X-ray and gamma-ray with flattening energy ranging from 0.08-7.0MeV is obvious.

Description

technical field [0001] The invention relates to an ionization chamber design technology of a radiation dosimeter, in particular to a method for using aluminum material to compensate the X and γ energy responses of an ionization chamber. Background technique [0002] When measuring X and gamma radiation doses, the wall material of the ionization chamber can be non-air equivalent material. Considering the comprehensive performance requirements of the ionization chamber, such as mechanical properties, welding tightness, moisture resistance, corrosion resistance, and processing technology, the chamber walls (high voltage pole and collector) are generally made of high-quality alloy steel materials. For X, γ radiation dose and dose rate meters used for radiation protection, relevant national standards require that the response of X, γ radiation energy within the range of 0.08~1.5MeV must be within 137 Within ±30% of Cs response. However, the response of the steel ionization cham...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/185
Inventor 靳根钱钟敏刘倍陈法国徐园王希涛杨亚鹏
Owner CHINA INST FOR RADIATION PROTECTION
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