适用于碘吸附器性能评价的低浓度甲基碘分析方法的实验研究

Experimental study on lowly concentrated CH_3I measurement for iodine absorber efficiency evaluation

为了克服放射性甲基碘法的放射性操作的缺点,开展了非放射性甲基碘(CH3127I)进行碘吸附器性能评价的研究。本文主要介绍该研究的关键技术:即非放CH3127I分析方法的建立。通过实验比较了多种检测灵敏度较高的CH3127I分析方法,最终推荐CH3127I经色谱纯无水乙醇吸收-气相色谱分析方法,该方法吸收液最低定量检测限为0.006 7μg/m L,试验时注入系统CH3127I量仅占其设计吸附容量的2.0%,对碘吸附器吸附CH3131I性能无显著影响,建立的CH3127I分析方法应用于碘吸附器性能评价是可行的。

To overcome the defect of being radioactive operation,CH1273 I was tentatively used in iodine absorber performance evaluation. The difficulty for the research is about the analytical method for CH1273 I.This paper recommends that CH1273 I is analyzed by GC. The results show that the limit deterministic concentration is low,the injected CH1273 I is only 2% relative to the designed adsorbed capacity. The imported biggest amount of stable CH1273 I will not greatly damage the performance of iodine absorbers to absorb radioactive CH1313 I in nuclear facilities. It is feasible when CH1273 I is absorbed by chromatographgrade ethanol,then analyzed by GC.