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A method for obtaining the source peak detection efficiency of a cylindrical detector for a point source

A technology of detection efficiency and acquisition method, which is applied in the direction of instruments, measuring devices, scientific instruments, etc., can solve complex acquisition problems, achieve the effects of expanding the application range, obtaining parameters in a short time-consuming, and simple methods

Active Publication Date: 2020-12-25
EAST CHINA UNIV OF TECH
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Problems solved by technology

Accordingly, Chen Li et al. proposed a method combining numerical calculation and MC, but there are two problems: ① The derived formula can only calculate the source-peak detection efficiency value of the point source directly above the top surface of the cylindrical detector; ② The intrinsic efficiency parameter of the point source in the formula (the source peak detection efficiency of the cylindrical detector emitting gamma rays with a specific energy E at different angles to the point source at the specified position) array acquisition is complicated

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  • A method for obtaining the source peak detection efficiency of a cylindrical detector for a point source

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Embodiment 1

[0018] Embodiment 1: The present invention will be described in more detail through the drawings and specific embodiments below.

[0019] Embodiment adopts the CeBr of SCIONIX company 3 Cylindrical detector, after geometric structure calibration (the schematic diagram of the vertical section of the central axis is shown in figure 2 Shown) parameters are respectively: cylinder detector bottom surface radius r=1.27cm, height l=2.54cm; the size of each shielding layer from inside to outside is: AlO 3 Vertical thickness D of the top surface of the reflective layer 1 =0.05cm, side axial length C 1 =0.05cm, the vertical thickness D of the top surface of the polyethylene damping layer 2 =0.83cm, side axial length C 2 =0.355cm, vertical thickness D of Al shell top surface 3 =0.08cm, side axial length C 3 = 0.125 cm. Cs-137 source characteristic gamma ray energy E=661.657keV, look up gamma ray and matter interaction cross-section database to know AlO 3 The total attenuation co...

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Abstract

The invention discloses a method for obtaining the source peak detection efficiency of a cylindrical detector to a point source, which is characterized in that the exponential attenuation law of narrow-beam gamma rays in matter and the superposition principle of gamma field are used to construct a cylindrical detector source of any size Analytical equation for peak detection efficiency. According to the principle that the square sum of weighted deviations between the source peak detection efficiency MC software simulation value of 11 designated point sources and the calculated value of the above analytical equation is the smallest after replacing all shields outside the cylindrical detector with vacuum, the specified energy gamma rays are obtained All-energy peak-line attenuation coefficient in a cylindrical detector. This method avoids the shortcomings of the previous numerical calculation methods that require the intrinsic efficiency parameter array of the point source and the time-consuming MC software simulation, and can quickly obtain the source peak detection of the point source at any position by the cylindrical detector only based on the detection model parameters efficiency value.

Description

technical field [0001] The invention relates to the technical field of radiation environment monitoring, in particular to a method for obtaining the source peak detection efficiency of a cylindrical detector for a point source. Background technique [0002] Corresponding detectors must be used for gamma radiation monitoring in the environment. At present, cylindrical or coaxial detectors (equivalent to a small cylindrical detector dug out of a large cylindrical detector) are mostly used. In order to estimate the activity of the specified radionuclide in the sample to be tested in the radiation environment, the source peak detection efficiency of the detector must be obtained (the specific energy γ-ray full-energy peak count size that can be recorded by the detector per unit activity source). Considering the impact of radiation safety and the high comprehensive cost of purchasing various standard sources, in the past, Monte Carlo (MC for short) software was used to simulate t...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01T1/16
CPCG01T1/1606
Inventor 吴和喜刘玉娟杨悦赵剑坤张怀强刘义保
Owner EAST CHINA UNIV OF TECH
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