Abstract
Systematic annealing experiments on fission tracks in different planes of apatite are carried out in order to observe its anisotropic behaviour. The anisotropic effect is found to increase with annealing rate. It is observed that the fission tracks parallel to the c-axis in apatite crystal exhibit a far greater resistance to annealing than those registered in any other orientation. The annealing rate, Va and the activation energy, Ea, are also found to vary with the crystallographic orientation.
