engleski

Application of cavity theory to the response of various TLDs to Co-60 gammas degraded in water

Several types of thermoluminescent dosimeters (LiF:Mg, Ti, Al_2O_3:Mg, Y and CaF_2:Mn) were irradiated at different depths in a water phantom placed at a distance of 2.5 m from a panoramic Co-60 source. Detectors were encapsulated in Plexiglas holders with a wall thickness of 0.5 cm. Reference dosimetry was carried out using a Fricke dosimeter and an ionization chamber. The experimental data were compared with the predictions of the general cavity theory for gamma ray spectra at different depths of water. The suitability of parameters of th! e cavity theory proposed by different authors was evaluated int he analysis of the experimental results. The results show that there is no need for any modification to the original and simple Burlin expression which gives very good agreement with the experimental values.

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