Anisotropy effects of EPR signals and mechanisms of mass transfer in toothenamel and bones

Peculiarities of the internal construction of tooth enamel and bones that c ause anisotropy effects and mass transfer in these objects are described. I t is shown that the composition of the mineral component of teeth and bones depends on a mechanical-electrical mechanism, which pumps ions into nanocr ystals. Decrease in the efficiency of the mechanical-electrical mechanism r esults in demineralization of enamel and bones, which progresses most rapid ly at a disease of the biomineral or under special conditions, such as in s pace flights. Effects of signal anisotropy in the practice of retrospective EPR dosimetry are discussed. (C) 2000 Elsevier Science Ltd, All rights res erved.