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Radiation Protection Dosimetry 33:275-278 (1990)
© 1990 Oxford University Press

Dosimetric Properties of Carbon Loaded LiF Detectors for Beta Photon Extremity Dosimetry

B. Burgkhardt and A. Klipfel

The dosimetric properties of carbon loaded LiF detectors manufactured by Alnor and Vinten are presented in comparison with various LiF detectors. In particular, the beta and photon response, the residual reading after repeated annealing in the oven or reader as well as light sensitivity and fading are discussed. In comparison with LiF detectors of 240 mg.cm-2, LiF + C detectors indicate a photon response of only 2% and in finger rings irradiated on a finger phantom an unexpected high photon energy response. Regarding repeated use, oven annealing in air or N2 affects mainly Vinten LiF + 1%C by discoloration and reduces the 147Pm response of LiF + C detectors by between 1% and 6% per N2 annealing, whereas reader annealing in the Toledo and Alnor reader does not affect the relative beta response. The residual dose H0 of LiF + C remains sufficiently low after oven annealing, but increases for Alnor LiF + 4% C after reader annealing, which is therefore more suitable for Vinten LiF + 1% C. Spurious detector reading exceeds H0 and its standard deviation by a factor of 2 to 3.


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