研究目的
To propose a method for e?ciency calibration of HPGe detector employed in a prompt gamma-ray neutron activation analysis (PGNAA) system for large aqueous sample analysis.
研究成果
The proposed approach successfully obtained the efficiency calibration curve of HPGe detector in a PGNAA system for large aqueous sample determination. The calibration curve was validated by determining the mass of manganese in an aqueous sample, showing relative deviations of 5.0% and 6.5% for the 7.058 MeV and 7.243 MeV peaks, respectively.
研究不足
The method's accuracy is dependent on the counting statistics of the gamma-ray peak and the efficiency transfer method's assumptions. The uncertainties of the results are mainly due to the counting statistics and the efficiency ratio.
1：Experimental Design and Method Selection:
The method combines experimental measurements of a reference surface gamma-ray source with e?ciency transfer method to obtain e?ciency of a volumetric source.
2：Sample Selection and Data Sources:
Aqueous samples containing sodium chloride and manganese were used.
3：List of Experimental Equipment and Materials:
HPGe detector (Model: GMX30P4–70), ORTEC multichannel analyzer (Model: DSPEC-50), 252Cf neutron source, and MASTERO software for spectrum collection.
4：Experimental Procedures and Operational Workflow:
The distance of gamma-ray source from the detector was set to 24 cm, and acquiring times were set for different measurements.
5：Data Analysis Methods:
Gaussian functions were used to fit the peaks and obtain the net areas, and a fifth order polynomial was used to obtain the calibration curve.
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