| In this study,the content of talc powder doped in flour was detected by neutron activation method,and the corresponding spectrum analysis software was designed to quantitatively analyze the composition of talc.The neutron irradiated the sample to be detected,and the irradiated sample was placed under the NaI scintillator detector for measurement.An online analysis software was designed for the unlatch process of the measured delayed gamma ray energy spectrum.The software is compiled in C++ language,and the project framework is built based on MFC class library,which realizes a series of functions such as reading γ-ray energy spectrum file,data smoothing,energy calibration,background deduction,peak searching,component analysis and so on.The experimental measurement process and software design ideas of this study are all based on the principle of standard comparison method.A large number of standard samples containing talc powder with different mass fractions were irradiated by neutron,software solves the delayed γ-ray energy spectrum of the standard sample,identifies the target characteristic peak released by the radionuclide generated by irradiation,and establishes the functional relationship between the talc powder content and the target characteristic peak intensity.Controlling the same experimental conditions,irradiate any sample of the flour to be measured,solving the delayed γ-ray energy spectrum of the sample to be measured,identify the target characteristic peak,and bring in the corresponding content calibration function relationship to give the talc powder content.neutron yield is particularly important as one of the important factors affecting elemental analysis in the experiment of neutron activation analysis.In this study,the neutron yield of D-T neutron tube was calculated by using the principle of nuclear activated slice cross-section method to combine MCNP theoretical simulation and experimental measurement. |
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