Determination of Uranium Isotopes in Spent Nuclear Fuels by Isotope Dilution Mass Spectrometry

동위원소희석 질량분석법을 이용한 사용후핵연료 중 우라늄 동위원소 정량

  • 김정석 (한국원자력연구소 원자력화학연구부) ;
  • 전영신 (한국원자력연구소 원자력화학연구부) ;
  • 손세철 (한국원자력연구소 원자력화학연구부) ;
  • 박순달 (한국원자력연구소 원자력화학연구부) ;
  • 김종구 (한국원자력연구소 원자력화학연구부) ;
  • 김원호 (한국원자력연구소 원자력화학연구부)
  • Received : 2003.09.29
  • Accepted : 2003.10.16
  • Published : 2003.12.25


The determination of uranium and its isotopes in spent nuclear fuels by isotope dilution mass spectrometry (IDMS) has been studied. The spent fuel samples were dissolved in 8 M $HNO_3$ or its mixture with 14 M $HNO_3-0.05M$ HF. The dissolved solutions were filterred on membrane filter with $1.2{\mu}m$ pore size. The uraniums in the spiked and unspiked sample solutions were quantitatively adsorbed by anion exchange resin, AG 1X8 and eluted with 0.1 M HCl. The contents of uranium and its isotopes ($^{234}U$, $^{235}U$, $^{236}U$$^{238}U$) in the spent fuel samples were determined by isotope dilution mass spectrometric method using $^{233}U$ as spike. The spike reference solution was standarized by reverse isotope dilution mass spectrometry (R-IDMS) using natural and depleted uranium. The results from IDMS were in average relative difference of 0.34% when compared with those by the potentiometric titration method.


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