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Method for determining detection efficiency of internal exposure HPGe detector based on CT data

A detection efficiency and detector technology, applied in the field of radiation measurement, can solve problems such as low precision, difference in calibration curves, and inability to meet clinical application time, and achieve high precision and meet time requirements

Active Publication Date: 2015-01-07
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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Problems solved by technology

At present, the accuracy of the efficiency calibration method using a reference person or a general phantom is low, because of the heterogeneity of human tissue and the large differences between different individuals, resulting in differences in the calibration curves
In addition, for each individual to be tested, based on the fine digital model of the real human body, the Monte Carlo method to calculate the detection efficiency curve cannot meet the clinical application time (minutes) requirements

Method used

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  • Method for determining detection efficiency of internal exposure HPGe detector based on CT data
  • Method for determining detection efficiency of internal exposure HPGe detector based on CT data
  • Method for determining detection efficiency of internal exposure HPGe detector based on CT data

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Embodiment Construction

[0016] The present invention will be further described below in conjunction with accompanying drawing:

[0017] like figure 1 Shown, the implementation process of the present invention is as follows:

[0018] (1) Characterization of detection performance of HPGe detector. The characterization of the detection performance of HPGe detectors is the premise of carrying out the numerical calculation and calibration of the in vitro detection efficiency of HPGe detectors under human internal irradiation. Detection efficiency, to avoid a series of errors in the experimental measurement of the absolute efficiency of the detector.

[0019] Specific steps are as follows:

[0020] (a) if figure 2 As shown, the typical HPGe detector size parameters are as follows: D=76mm, d=61mm, H=28.5mm, L1=5mm, L2=1.5mm, L3=0.5mm, L4=1.5mm, L5=3.2mm, L6 = 1mm. The coordinate origin is the center position of the end face of the HPGe detector 11, three or more groups of radioactive isotope point so...

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Abstract

The invention relates to a method for determining the detection efficiency of an internal exposure HPGe detector based on CT data. Based on different energy gamma ray full-energy peak detection efficiency measuring data, Monte Carlo particle transport numerical values are adopted for computing, so that geometrical parameters of a detector sensitive area are adjusted, and the geometrical parameters of the detector sensitive area are obtained; the Monte Carlo particle transport numerical values are adopted for computing, so that the corresponding differential detection efficiency distribution of different energy gamma rays on the surfaces of the detector in different discrete areas and different discrete angle phase spaces is solved; based on CT medical image data of a human body to be detected, a voxel model of human anatomy structural features and a voxel model of an interesting organ or area are established, and the interesting organ or area serves as a source area; an exponential decay formula is used for solving the direct-through gamma ray share from a source area voxel to a surface element on the surface of the detector, and established differential detection efficiency distribution data are used for obtaining the detector full-energy peak detection efficiency specific to the source area through the multiple integral.

Description

technical field [0001] The invention relates to the technical field of radiation measurement, in particular to a method for determining the detection efficiency of an internally illuminated HPGe detector based on CT data. Background technique [0002] Quantitative measurement of radionuclides deposited in human lungs via the respiratory tract, assessment of human radionuclide intake and internal exposure dose, and protection of personal safety and health of operators in nuclear-related positions are essential. The key to the quantitative measurement of the thyroid or lungs by using in vitro HPGe detectors for staff in nuclear-related positions is to accurately calibrate the source-peak detection efficiency of the detectors. At present, the accuracy of the efficiency calibration method using a reference person or a general-purpose phantom is low, because the non-uniformity of human tissue and the large difference between different individuals cause the difference in the calib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T1/24
Inventor 陈朝斌曹瑞芬裴曦胡丽琴吴宜灿
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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