另外，前剂量技术中一些复杂因素，也是导致年代测定误差大的可能原因。

Besides, some complicated factors in the pre-dose technique would be the possible cause of the greater errors.

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在研究中发现，兴奋剂在学龄前儿童中的使用在减少，在6 - 12岁儿童中没有显著的剂量增减，而在青少年中的使用呈增长趋势。

Stimulant use in preschoolers decreased over the study period and did not significantly change in children aged 6 to 12, leaving the increase primarily in the adolescent population.

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主要的预防措施：在放射性碘治疗后6个月内应避免妊娠。此外，在再次妊娠前应稳定甲状腺素的使用剂量。

One major precaution: Pregnancy should be avoided for 6 months after radioactive iodine therapy. Also, thyroxin dose should be stabilized before getting pregnant again.

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