Abstract
The method of alpha-particle spectrometry based on LiF fluorescent nuclear track detectors was proposed and tested. It is based on the direct evaluation of a particle range from the parameters of the fluorescent image of the track. This method utilizes the fluorescence of F2 color centers created in LiF crystal lattice by ionizing radiation. Using a wide-field fluorescent microscope it is possible to image the particle track with sub-micrometer resolution in 3D and measure its length, which in turn enables calculation of particle energy. Irradiations with various alpha sources confirmed the effectiveness of the method, which allows evaluating not only the particle energy but also the angle of incidence. The method was applied to the Am-241 source installed in the widely used research device: Risø DA-20 TL/OSL reader. The results revealed that the actual spectrum differs considerably from the nominal one, which may significantly influence the interpretation of results of the experiments conducted with this and similar instruments.
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