Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT) (방사성폐기물학회지)

Korean Radioactive Waste Society (한국방사성폐기물학회)
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Analysis of $^{99}Tc$ and Its Activity Level in the Korean Soil

한국 토양의 $^{99}Tc$ 분석 및 방사능 농도 준위

  • Published : 2009.03.30
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Abstract

An analytical method of $^{99}Tc$ concentration in soil was set up and discussed considering the $^{99}Tc$ concentration in Korean soil measured with its analytical method. A selective TEVA resin was used to separate and purify the $^{99}Tc$ in the soil sample. $^{99m}Tc$ from a commercial $^{99}Mo/^{99m}Tc$ generator was used as a yield tracer for the chemical separation of $^{99}Tc$ and its problem when using $^{99m}Tc$ as a tracer was discussed. The chemical recovery yield of $^{99}Tc$ was above 70%. The optimum conditions of inductively coupled plasma mass spectrometry system(ICP-MS) were set up to determine the $^{99}Tc$ after the separation process. The minimum detectable activity(MDA) was 15 mBq/kg-dry in this analytical procedure. The $^{99}Tc$ concentration in soils of Jeju and Kori were measured in the rage of 33.73-89.16 mBq/kg-dry. Those values were less than those reported in other countries and seemed to be originated from atmospheric fallout.

토양중 $^{99}Tc$의 배경준위를 측정할 수 있는 분석법을 수립하고 한국 토양중의 $^{99}Tc$ 농도를 비교 검토하였다. 토양중의 $^{99}Tc$을 분리 정제하기 위해서 선택성 TEVA수지를 사용하였다. 화학분리 회수율을 계산하기 위해 $^{99}Mo/^{99m}Tc$ 생성기에서 생산한 $^{99m}Tc$를 추적자로 사용하고 그 문제점을 검토하였다. $^{99m}Tc$추적자를 사용하여 계산한 화학분리 회수율은 70% 이상이 가능하였다. 순수 분리된 $^{99}Tc$의 측정을 위한 유도결합프라스마 질량분석기(ICP-MS)의 최적 조건을 수립하였다 이 분석법에 의한 토양의 최소검출하한치(MDA)는 15 mBq/kg-dry 이었다. 제주와 고리 주변 토양 시료의 $^{99}Tc$ 농도는 33.73-89.16 mBq/kg-dry 였다. 이러한 수치는 다른 보고치에 비하여 낮은 편이며 대기권 핵실험에서 기인한 낙진의 영향으로 추정된다.

Keywords

References

  1. 과학기술부, 중,저준위 방사성 폐기물 인도 규정, 과학기술부 고시 제200-15호(2005).
  2. 백정석, 정의영, 안상복, 김완, "방사성폐기물 처분시설 주변의 방사선 환경조사," 방사성폐기물학회지, 6(4), p 387-398(2008).
  3. V. Smith, M. Fegan, D. Pollard, S. Long, E. Hayden and T. P. Ryan, "Technetium-99 in the Irish marine environment," Journal of Environmental Radioactivity. 56, pp. 269-284 (2001). https://doi.org/10.1016/S0265-931X(00)00209-5
  4. K. S. Leonard, D. McCubbin, P. McDonald, M. Service, R. Bonfield and S. Conney, "Accumulation of technetium-99 in the Irish Sea," Journal of Environmental Radioactivity. 322, pp. 255-270(2004).
  5. R. Bennett and N. Willey, "Soil availability, plant uptake and soil to plant transfer of $^{99}Tc$ - a review," Journal of Environmental Radioactivity. 65, pp. 215-231 (2003). https://doi.org/10.1016/S0265-931X(02)00098-X
  6. K. Tagami, S. Uchida, T. Hamilton, and W. Robison, "Measurement of technetium-99 in Marshall Islands soil samples by ICP-MS," Applied Radiation and Isotopes. 53, pp 75-79 (2000) https://doi.org/10.1016/S0969-8043(00)00115-9
  7. R. Seki and M. Kondo, "An improved method for technetium determination in environmental samples," Journal of Radioanalytical and Nuclear Chemistry, 263(2), pp. 393-398 (2005). https://doi.org/10.1007/s10967-005-0068-3
  8. L. Skipperud, D. H. Oughton, L. S. Rosten, M. J. Wharton and J. P. Day, "Determination of technetium-99 using electrochemical vaporization inductively coupled plasma-mass spectrometry (ETV-ICP-MS) and NH4OH as chemical modifier, 98, pp. 251-263 (2007). https://doi.org/10.1016/j.jenvrad.2007.05.004
  9. S. Uchida and K. Tagami, "Improvement of $^{99}Tc$ separation procedure using a chromatographic resin for direct measurement by ICP-MS," Analytica Chimica Acta, 357, pp. 1-3 (1997). https://doi.org/10.1016/S0003-2670(97)00562-X
  10. A. Bartosova, P. Rajec and M. Reich, "Preparation and characterization of an extraction and characterization of an extraction chromatography column of technetium separation based on aliquat-336 and silica gel support," Journal of Radioanalytical and Nuclear Chemistry, 261(1), pp. 119-124 (2004). https://doi.org/10.1023/B:JRNC.0000030944.93883.58
  11. F. Wigley, P.E. Warwick, I. W. Croudace, J. Caborn and A.L. anchez, "Optimized method for the routine determination of technetium-99 in environmental samples by liquid scintillation counting," Analytica Chimica Acta, 380, pp. 73-82 (1999). https://doi.org/10.1016/S0003-2670(98)00676-X
  12. S. Morita, C. K. Kim, Y. Takaku, R. Seki and N. Ikeda, "Determination of technetium-99 in environmental samples by inductively coupled plasma mass spectrometry," Applied Radiation and Isotopes, 42(6), pp. 531-534 (1991). https://doi.org/10.1016/0883-2889(91)90157-V
  13. J. L. Mas, M. Garcia-Leon, J.P. Bolivar, "$^{99}Tc$ atom counting by quadrupole ICP-MS. Optimasation of the instrumental response," Nuclear Instruments and Methods in Physics Research. A484, pp. 660-667 (2002).
  14. K. Tagami and S. Uchida, "Analysis of technetium-99 in soil and deposition samples by inductively coupled plasma mass spectrometry," Applied Radiation and Isotopes, 47(9/10), pp. 1057-1060 (1996). https://doi.org/10.1016/S0969-8043(96)00106-6
  15. M. Attrep, A. Enochs and L. D. Broz, "Atmospheric Technetium-99," Environmental Science and Technology, 5(4), pp. 344-345 (1971). https://doi.org/10.1021/es60051a006
  16. X. Hou, M. Jensen and S. P. Nielsen, "Use of 99mTc from a commercial $^{99}Mo/^{99m}Tc$ generator as yield tracer for the determination of 99Tc at low levels," Applied Radiation and Isotopes, 65, pp. 610-618 (2007). https://doi.org/10.1016/j.apradiso.2007.01.013
  17. J. L. Mas, M. Garcia-Leon, J. P. Bolivar and C. Sanchez-Angulo, "The use of $^{99m}Tc$ as a tracer in the determination of $^{99}Tc$ by ICP-mass spectrometry," Journal of Analytical Atomic Spectrometry, 15, pp. 1369-1373 (2000). https://doi.org/10.1039/b004273k
  18. M. H. Lee, C. W. Lee and B. H. Boo, "Distribution and characteristics of $^{230,240}Pu\;and\;^{137}Cs$ in the soil of Korea," Journal of Environmental Radioactivity, 37(1), pp. 1-16 (1997). https://doi.org/10.1016/S0265-931X(96)00080-X
  19. M. H. Lee and C. W. Lee. "Association of falloutderived $^{137}Cs,\;^{90}Sr\;and\;^{230,240}Pu$ with natural organic substances in soils," Journal of Environmental Radioactivity, 47, pp. 253-262 (2000). https://doi.org/10.1016/S0265-931X(99)00033-8
  20. A. Aarkrog, H. Dahlgaard, L, Hallstadius, E. Holm, S. Mattson and J. Rioseco, Technetium in the Environment : Time trend of $^{99}Tc$ in seaweed from Greenland waters, pp. 69, Elsevier App!. Sci. Pub., New York (1986).
  21. T. R. Garland, D. A. Cataldo, K. M. McFadden, R. G. Schreckhise and R. E. Wildung, "Comparative behavior of $^{99}Tc,\;^{129}I,\;^{127}I,\;and\;^{137}Cs$ in the environment adjacent to a fuel reprocessing facility," Health Physics, 44, pp. 658 (1983).
  22. K. Tagami and S. Uchida, "Separation procedure for the determination of technetium-99 in soil rCP-MS," Radiochimica Acta, 63, pp. 69(1993).
  23. S. Morita, K. Tobita and M. Kurabayashi, "Determination of technetium-99 in environmental samples by inductively coupled plasma mass spectrometry," Radiochimica Acta, 63, pp. 63(1993).