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Radiation Protection Dosimetry 85:149-152 (1999)
© 1999 Oxford University Press

Estimation of the Time Elapsed Between Exposure and Readout Using Peak Ratios of LiF:Mg,Cu,P (MCP-N,GR200A)

M. Budzanowski, J.C. Saez-Vergara, E. Ryba, P. Bilski, P. Olko and M.P.R. Waligórski

The applicability of peak area ratios (peak2/peak4 and peak3/peak4) in the glow curves of LiF:Mg,Cu,P for the estimation of time between exposure and readout, tER, was studied. MCP-N and GR-200 LiF:Mg,Cu,P detectors were exposed to simulate an 'accidental' dose at times before readout ranging from 24 h to 3 months. Two groups of detectors were exposed simultaneously to determine the fading of irradiated detectors and the sensitivity variations of stored, non-irradiated detectors. Peak areas were evaluated using a computerised glow curve analysis code. The peak 2/peak 4 ratio is well suited for evaluating tER below 1 week, while the peak 3/peak 4 ratio serves for tER up to 3 months. The method can be applied in personal and environmental dosimetry to evaluate the date of a high dose rate, accidental exposure.


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