With increasing down-hole temperature, average track lengths also decrease, however, annealing anisotropy of fission tracks in apatite increases.

磷灰石中古裂变径迹的长度也随井温升高而减小，而磷灰石古径迹退火的各向异性却随井温升高而增大。

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With increasing down-hole temperature, average track lengths also decrease, however, annealing anisotropy of fission tracks in apatite increases.

磷灰石中古裂变径迹的长度也随井温升高而减小，而磷灰石古径迹退火的各向异性却随井温升高而增大。

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