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Radiation Protection Dosimetry 33:251-253 (1990)
© 1990 Oxford University Press

Precision and Lower Detection Limit of TLD-100 with Glow Curve Analysis

W. de Vries and A.J.J. Bos

A computer program for glow curve analysis in routine dosimetry with LiF:Mg,Ti (TLD-100) has been developed. The program is based on advanced knowledge of the physical parameters of the glow peaks 2, 3, 4 and 5 of TLD-100, i.e. the order of kinetics of the peaks, the activation energies E and the escape frequency factors s. For fixed procedures, these parameters are constant for varying doses and radiation energies. Therefore a glow curve can be described by only four parameters: the areas of the four main glow peaks in TLD-100. This method of glow curve analysis was tested for a fixed readout procedure. Precision of dose measurement and lower detection limit were used as test parameters. Using the method of glow curve analysis the precision of dose measurement at a 0.5 mGy level is 1%, compared to 4% by using the method of integrating part of the glow curve. The detection limit decreases from 0.1 mGy with the integration method to 0.05 mGy with glow curve analysis.


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