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Detection method based on ionization chamber system

A detection method and ionization chamber technology, applied in the field of radiation monitoring, can solve problems such as low measurement accuracy and inability to adjust the position accurately, and achieve the effect of high controllability and improved measurement accuracy

Inactive Publication Date: 2019-09-27
NAT INST OF METROLOGY CHINA
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Problems solved by technology

The position of the graphite ionization chamber cannot be adjusted precisely, resulting in low measurement accuracy of the existing ionization chamber detection system

Method used

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  • Detection method based on ionization chamber system
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Embodiment Construction

[0027] The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0028] The detection method based on the ionization chamber system provided by the embodiment of the present invention is implemented in the ionization chamber system. The ionization chamber system includes a multi-dimensional adjustment platform device and a filtering device. In order to facilitate the understanding of the detection method provided by the embodiment of the present invention, firstly combine figure 1 , the ionization chamber system on which the inventive detection method is based is introduced.

[0029] figure 1 Schematic diagram of the structure of the ionization chamber system provided by the embodiment of the present invention. As shown in the figure, the ionization chamber system of the embodiment of the present invention includes: a multi-dimensional adjustment platform device, a filter device (n...

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Abstract

An embodiment of the invention relates to a detection method based on an ionization chamber system. The detection method comprises the steps of: arranging an X-ray machine on an X-ray machine platform; inserting an additional filter into a filtering device; adjusting the filtering device so that the center of the additional filter and an X-ray emitting position of the X-ray machine are positioned on the same horizontal position; driving a first base to move to an operating position on a first guide rail; driving a second base to move to an operating position on a second guide rail; adjusting a lifting device and a rotary table on the lifting device, so that a ray receiving position of an ionization chamber device arranged on the rotary table, the center of the additional filter and the X-ray emitting position of the X-ray machine are positioned on the same straight line; generating an initial X-ray beam by the X-ray machine; filtering out rays lower than first threshold energy after the initial X-ray beam passes the additional filter; subjecting air in the ionization chamber device to ionization by means of the filtered X-ray beam, and generating an ionization current; and detecting the ionization current by means of an electrometer to obtain an ionization current value.

Description

technical field [0001] The invention relates to the technical field of radiation monitoring, in particular to a detection method based on an ionization chamber system. Background technique [0002] At present, the main reference ionization chambers used at home and abroad include free air ionization chambers and graphite cavity ionization chambers. In the establishment of 250kV~600kV X-ray air kerma benchmark, when the X-ray tube voltage exceeds 400kV, the increase of the secondary electron distance makes the electrode distance of the free air ionization chamber very large, because the free air ionization chamber is relatively large in the measurement Due to the limitations of high-energy rays, it is now planned to use a graphite cavity ionization chamber as a reference ionization chamber. [0003] The ionization chamber detection system is a detector that uses the ionizing effect of ionizing radiation to measure ionizing radiation. In the process of applying the ionizatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01T1/185
Inventor 吴金杰李婷余继利周振杰廖振宇
Owner NAT INST OF METROLOGY CHINA
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