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The reactivity worth of xenon poisoning and the densities of 135X and 135Xe were derived when the reactor was restarted up in iodine pit. 本文研究反应堆碘坑内的启动问题，导出了热堆在碘坑内启动时氙毒反应性、碘和氙浓度随时间变化的解析表达式。