fission hole 裂变中子辐照孔
When planets are close to the black hole, their material structures are torn up creating a strange centripetal nuclear fission.
星体在接近黑洞时，星体的物质结构被撕裂，这是奇怪的向心核裂变。
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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