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Report No.

Preparation of $$^{91}$$Zr isotope standard solution for isotope dilution mass spectrometry

Konda, Miki; Asai, Shiho; Hanzawa, Yukiko  ; Magara, Masaaki  

It is important to measure the inventory of radionuclides in high-level radioactive waste for safe and reasonable geological disposal of the waste. For verification of the reliability of the inventory assessment by measured value, we planned to quantify the long-lived nuclides $$^{93}$$Zr, that is important for safety evaluation of radioactive waste disposal, using isotope dilution inductively coupled plasma mass spectrometry (ID-ICP-MS) we developed. Spike (isotope standard solution) is required to apply the IDMS. We prepare $$^{91}$$Zr isotope standard solution by dissolving the metallic $$^{91}$$Zr isotope standard. The metallic Zr dissolves in HF, but HF dissolve glass and has high toxicity. Therefore it is necessary to reduce an amount of HF and to simplify a dissolution method. At first, we examined the dissolution method of the metallic Zr. The isotope standard of $$^{91}$$Zr was dissolved under optimum condition that obtained by the previous examination. The prepared $$^{91}$$Zr isotope standard solution was measured using the IDMS to determine concentration, which gave us a high-accuracy value.



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