Anthropogenic I-129 concentration and I-129/I-127 ratio in rainwater from Seville (Spain) in the period 2005-2008 as affected by airborne releases from Sellafield and La Hague facilities

作者：Gomez Guzman J M^*; Enamorado Baez S M; Pinto Gomez A R; Abril Hernandez J M; Lopez Gutierrez J M; Garcia Leon M

来源：Atmospheric Environment, 2012, 56: 26-32.

DOI：10.1016/j.atmosenv.2012.03.075

• AMS
• ICP-MS
• I-129
• I-122
• Rainwater
• Reprocessing plants

I-129 is a very long-lived radionuclide (T-1/2 = 15.7 X 10(6) years) that is present in the environment both because of natural and anthropogenic sources. In this work I-129 concentration and I-129/I-129 ratio have been determined in rainwater samples collected at Seville (south-western Spain) during the period 2005-2008. Typical I-129 concentration range from (0.26-8.86)x 10(8) atoms/L, while I-129 deposition are normally in the order of 10(7)-10(8) atoms/m(2)d. Variability in the isotopic ratio I-129/I-129 indicates a range of (0.17-8.71) x 10(-8). Temporal evolution of the I-129 deposition seem to be related with the history of the I-129 gaseous releases from the European reprocessing facilities at Sellafield and La Hague. The results obtained in this work are lower than the reported in previous works for the same location during the period 1996-1999, probably due to the reduction of the total gaseous I-129 releases emitted by Sellafield and La Hague. The study of the dependence of the I-129 deposition with some atmospheric parameters suggests that deposition seems to be more important in wet than in dry periods and that also depends in the wind direction, being more important for winds with north to south component. The agreement between the I-129 concentration and the I-129/I-129 ratio suggest that the gaseous I-129 emitted by the reprocessing plants has enough time to equilibrate with the I-127 present in the atmosphere before arriving to southern Spain, probably due to the distance between Seville and these reprocessing plants.

• 出版日期2012-9