An improved analytical method for iodine-129 determination in low-level radioactive waste

作者：Hsieh Yi Kong; Wang TsingHai; Jian Li Wei; Chen Wei Han; Tsai Tsuey Lin; Wang Chu Fang^*

来源：Radiochimica Acta, 2014, 102(12): 1137-1142.

DOI：10.1515/ract-2013-2161

• Iodide
• alkaline digestion
• ICP-MS
• scalling factor
• radioactive waste treatment
• classification

In this study, an alkaline-digestion pretreatment and a subsequent ICP-MS measurement were conducted for iodine-129 (I-129) determination in low-level radioactive waste. A TMAH+ H2O2 + Triton X-100 mixed alkaline digestion was the most effective mixture for I-129 determination. Using this alkaline reagent, a high level of I-129 recovery (101 +/- 6%) was achieved for the analysis of the I-129-spiked standard reference materials NIST 2709 and 2711. Importantly, the I-129 concentrations determined for ten real samples provided by the Lan-Yu radioactive waste temporary storage site were found to be below the detection limit (0.011mg/kg). This value was only approximately 30-70% of the values determined using the I-129/Cs-137 scaling factor. This means that using the I129/ Cs-137 scaling factor severely overestimates the I-129 concentration in these low-level radioactive wastes. We therefore suggest that a detailed re-inspection of the I-129/ Cs-137 scaling factor should be performed to appropriately categorize these low-level radioactive wastes.

• 单位
  清华大学