Method for establishing low-dose-rate horizontal radiation substance

A technology of low dose rate and dose rate, which is applied in the field of radiation measurement, can solve problems such as X-ray low dose rate measurement, and achieve the effect of accurate dose rate level

Pending Publication Date: 2022-04-19
NAT INST OF METROLOGY CHINA
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for establishing low dose rate level radiation quality for the defects of the prior art, to solve the problem of X-ray low dose rate measurement in the prior art

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  • Method for establishing low-dose-rate horizontal radiation substance
  • Method for establishing low-dose-rate horizontal radiation substance
  • Method for establishing low-dose-rate horizontal radiation substance

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Embodiment Construction

[0042] The application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain related inventions, rather than to limit the invention. It should also be noted that, for the convenience of description, only the parts related to the related invention are shown in the drawings.

[0043] It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0044] figure 1 One of the schematic flowcharts of the method for establishing low dose rate level radiation quality provided by the embodiment of the present invention; as figure 1 As shown, the method includes the following steps:

[0045...

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Abstract

The invention provides a method for establishing a low-dose-rate horizontal radiation substance, and the method comprises the steps: carrying out the energy calibration of a spectrometer through a standard radioactive source, and obtaining a conversion relation between the channel address of the spectrometer and the energy of the standard radioactive source; ionization chamber calibration is carried out under the standard radiation substance, and a first calibration coefficient of the standard radiation substance is obtained; the method comprises the following steps: respectively setting tube voltages of an optical machine as a plurality of preset voltage values, adjusting tube currents under each preset voltage value, measuring an energy spectrum at a preset distance from an optical machine outlet through a spectrometer and measuring a dosage rate through an ionization chamber under the plurality of preset tube currents, and determining additional filtration from a plurality of filter sheets to be used, the dose rate is not greater than a preset dose rate threshold; each preset voltage value corresponds to one new radiation substance; the energy spectrum comprises energy and counting rate; according to the counting rate and the energy, calculating the average energy of the new radiation substance corresponding to each preset voltage value; and obtaining a second scale coefficient of the new radiation substance according to the first scale coefficient of the standard radiation substance.

Description

technical field [0001] The invention relates to the technical field of radiation measurement, in particular to a method for establishing radiation quality at a low dose rate level. Background technique [0002] The establishment of the X-ray standard radiation quality provides a reference for the standardized use of X-rays. The radiation quality is a form of describing the X-ray fluence spectrum. Currently, GB12162.1 is equivalent to ISO4037. The standard X-ray radiation quality recommended in it includes low Air kerma X-ray radiation mass series (L series), narrow spectrum series (N series), wide spectrum series (W series), high air kerma series (H series). The resolution and air kerma range of different series of radiation qualities are different, and these radiation qualities are in the order of increasing filtering: high air kerma series, broad spectrum series, narrow spectrum series, and low air kerma series. The dose rate values ​​of these four series of X-rays are re...

Claims

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Application Information

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IPC IPC(8): G01T1/36G01T1/14
CPCG01T1/36G01T1/14
Inventor 黄建微曹蕾杨扬李德红张璇张晓乐刘博成建波
Owner NAT INST OF METROLOGY CHINA
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