研究目的
To propose a semi-empirical detector response function (DRF) model of HPGe detector for fitting gamma-ray nondestructive assay transmission spectra.
研究成果
The semi-empirical DRF model for HPGe detectors in the energy range 200keV-1.5MeV reduces the number of parameters and each part has clear physical meanings. The model has good versatility and can be applied to different detection efficiency of HPGe detectors.
研究不足
The model is applicable to photon energies between 200 keV and 1.5 MeV. The single escape peak and double escape peak were ignored in the model as they were weak and out of the analysis range.
1：Experimental Design and Method Selection:
A semi-empirical model for the gamma-ray response between 1.0MeV and 6.5MeV was developed and applied to a 39% HPGe detector. The model for each single peak contained a step function, a Gaussian function, and an exponential tail function.
2：0MeV and 5MeV was developed and applied to a 39% HPGe detector. The model for each single peak contained a step function, a Gaussian function, and an exponential tail function.
Sample Selection and Data Sources:
2. Sample Selection and Data Sources: 152Eu spectra were obtained by using the 30%, 50%, 70% HPGe detector.
3：List of Experimental Equipment and Materials:
HPGe detector, transmission source, lead cylinder collimator.
4：Experimental Procedures and Operational Workflow:
The response function parameters were estimated for each source energy by using the weighted nonlinear least square fitting method.
5：Data Analysis Methods:
The appropriateness of a particular function was determined by the visual agreement between fitted function and experimental data for the fitting, and by the reduced chi-square value.
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