Skull counter virtual scale calibration method

Abstract

The invention provides a skull counter virtual scale calibration method which comprises the following steps: (1) establishing a Chinese reference human skull digital model according to a Chinese adultmale reference voxel model; (2) performing virtual representation on the detector, and establishing a detector model with a fine structure; (3) reconstructing a coordinate system of an irradiation scene, and uniformly distributing radionuclides on the inner and outer surfaces of the forebone and the overhead bone; (4) setting a particle transport process in Geant4, and establishing a Monte Carlosimulation process; and (5) simulating and calculating the detection efficiency, and carrying out virtual scale calibration. The skull counter virtual scale calibration method provided by the invention does not need a simulation skull model containing a radioactive source to carry out experimental measurement calibration, but directly calculates a calibration coefficient by utilizing a Monte Carlomethod through establishing a virtual experimental scene, so that the virtual calibration scale of the skull counter can be quickly and accurately realized.

Description

technical field [0001] The invention belongs to the technical field of nuclear radiation measurement, and in particular relates to a virtual scale calibration method for a skull counter. Background technique [0002] The skull counter is a measurement device used to measure the radionuclides deposited in the skull. The measurement data is used as the input item for the calculation of the internal radiation dose. The error of the measurement data will be amplified step by step in the process of dose calculation, so the measurement of the skull counter should be improved. Accuracy plays an important role in the calculation of internal radiation dose. The key to improving the measurement accuracy of the skull counter is to establish an accurate scale factor, that is, the ratio of the measured radionuclide activity to the real nuclear activity deposited in the skull. At present, there are two mainstream calibration methods in the world, experimental measurement calibration and ...

AI Technical Summary

Problems solved by technology

At present, there are two mainstream calibration methods in the world, experimental measurement calibration and virtual calibration calibration. The experimental calibration requires a simulated skull model containing radioactive sources for experimental measurement and calibration. This method requires high experimental conditions and high experimental costs. The scope of application of the calibration coefficient Narrow; therefore, virtual scale calibration has gradually become an important research direction in the world

Skull deposition nuclides are mainly deposited on the surface of the skull, and the current common virtual calibration method is to evenly distribute radionuclides in the volume of the skull, which causes a certain error between the virtual calibration scale coefficient and the actual value, so it is necessary to establish a new virtual scale of the skull counter Calibration method

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