Abstract
The 14 MeV neutron activation analysis method was used to measure talc in flour. The neutron yield of a D-T neutron generator was maintained at 1.32 × 107n∙s−1 to irradiate flour samples for one hour. A 1779 keV characteristic γ-ray produced by the 28Si(n,p)28Al reaction and 1369 and 2754 keV characteristic γ-rays produced by the 24Mg(n,p)24Na reaction were measured by a 3-inch NaI(Tl) detector and a 2-inch LaBr3(Ce) detector, respectively. The accuracy and detection limit of the talc content measured by the two detectors with different characteristic γ-rays were discussed. The results show that the best scheme for measuring talc content is measuring the 1779 keV γ-ray with the 3-inch NaI(Tl) detector. The detection limit reaches 0.07%, and the relative error of multiple measurements of the same sample is 2.07%. The relationship among the mass thickness of the sample, the talc content and the characteristic peak area was plotted.
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More From: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms
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