Method for ionization chamber X and gamma energy response compensation through nylon material

A technology of energy response and ionization chamber, which is applied in electrostatic dosimeters, circuits, discharge tubes, etc., and can solve problems such as the unsatisfactory tinning compensation effect

Active Publication Date: 2013-07-03
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

Method used

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  • Method for ionization chamber X and gamma energy response compensation through nylon material
  • Method for ionization chamber X and gamma energy response compensation through nylon material

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Embodiment Construction

[0011] The present invention will be described in detail below in conjunction with the accompanying drawings and implementation process.

[0012] The present invention uses carbon fiber reinforced nylon material to flatten the response of the steel ionization chamber to X and γ radiation in the energy range of 0.08-7.0 MeV, so that it can 137 Within ±30% of Cs response. Since the average atomic number of nylon is smaller than that of iron, when the nylon material is placed on the inner surface of the stainless steel chamber wall, the over-response problem of the ionization chamber in the energy range of 100-200keV can be better optimized.

[0013] 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. While the chamber wall contributes to the response, it also attenuates X and γ-rays. The attenuation ...

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Abstract

The invention relates to an ionization chamber design technology of a radiation dosage device, in particular to a method for ionization chamber X and gamma energy response compensation through a nylon material. According to the method, under the conditions that a collection electrode of an ionization chamber is made of aluminum and a high voltage electrode is made of stainless steel, a carbon fiber reinforced nylon material lining layer is arranged on the inner surface of the stainless steel high voltage electrode. Due to the fact that the carbon fiber reinforced nylon material lining layer with appropriate thickness is added on the inner surface of the stainless steel high voltage electrode, the problem that a steel ionization chamber excessively responds to an X ray and a gamma ray within the energy range of 100 kilo electron volts-200 kilo electron volts is solved. Meanwhile, variation of response to an X ray and a gamma ray within the energy over 300 kilo electron volts is not large and the effect of flattening response curves of an X ray and a gamma ray within the energy range of 0.08 million electron volts-7.0 million electron volts 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 nylon material to compensate the X and gamma 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. Since alloy steel is not an air-equivalent materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/14H01J47/00
Inventor 靳根刘倍徐园陈法国
Owner CHINA INST FOR RADIATION PROTECTION
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