Abstract
One of the main shortcomings of the TLD method is the exposure information deletion during readout. There are two ways of reassessment of high doses: performing a second reading and by the phototransferred thermoluminescence (PTTL). In the PTTL method, charge carriers, usually created by irradiation with ionising radiation, are transferred from deep traps to shallow traps, giving rise to lower temperature peaks. In the present work, LiF:Mg,Ti (TLD-100) cards were irradiated to several doses of gamma rays and thermal neutrons. The residual dose and the PTTL were evaluated for both radiations. It was found that both the residual dose and the PTTL are higher for the thermal neutrons than for the gamma rays. The residual dose after the first reading is about 2% for neutrons and about 0.2% for gamma rays, and the PTTL is about 9% for neutrons and about 2% for gamma rays. Neutron and gamma ray doses can be re-estimated by a second reading or by PTTL, but the factors are LET dependent.
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