The comet currently headed for the sun may be part of the so-called Kreutz group of comets, which are known for having orbits that bring them within a few hundred thousand miles of the sun.
The tail lengths of comet cell of all organs in group treated with high fluoride were increased compared with that of control group (P< 0.05).
高氟组的甲状腺、肝、肾和肺组织的细胞拖尾率反比低碘组的拖尾率有不同程度的降低（P>0.05）。
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Results:The comet rate and comet length of each tissue DNA in test groups increased significantly(P<0.05)compared with control group. And it showed a good dose-response relationship.