Method for acquiring source peak detection efficiency of cylindrical detector to 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: 2018-07-17
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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  • Method for acquiring source peak detection efficiency of cylindrical detector to point source
  • Method for acquiring source peak detection efficiency of cylindrical detector to point source
  • Method for acquiring source peak detection efficiency of cylindrical detector to 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 acquiring the source peak detection efficiency of a cylindrical detector to a point source. The method is characterized by constructing an analytic equation of thesource peak detection efficiency of an arbitrary-sized cylindrical detector by using the exponential decay law of a narrow-beam [gamma] ray in a substance and a [gamma] field superposition principle;according to a principle minimizing the weighted deviation squared sum between a source peak detection efficiency MC software simulation value of point sources at 11 designated positions after all the shields outside the cylindrical detector are replaced by vacuum and the calculated value of the above analytical equation, obtaining the all-energy peak attenuation coefficient of the specified energy [gamma] ray in the cylindrical detector. The method avoids the shortcomings that a conventional numerical calculation method a requires the intrinsic efficiency parameter array of the point sourceand has a long MC software simulation time length, and can quickly obtain the source peak detection efficiency value of the cylindrical detector to the point source at any position according to the detection model parameters.

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 Applications(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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