Ukrainian amber luminescence induced by X-rays and ultraviolet radiation

The paper is devoted to the luminescence study of a number of Ukrainian amber samples excited by ultraviolet radiation and X-rays. The photoluminescence spectra of the samples of different morphology are similar in shape and have a close position of the emission maxima. The radioluminescence spectra also have a similar shape, but there is a greater variation in the position of the maximum in comparison with UV case. The photoluminescence and radioluminescence spectra were analyzed through Gaussian function fitting. The results led to the assumption that there are two sources of luminescence radiation. In the case of photoluminescence the positions of the Gaussian maxima are shifted by 0.25 eV toward higher energies in comparison with radioluminescence.