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A spatial survey of iodine and its long‐lived isotope, 129 I, in 40 rivers of the USA, Canada, and western Europe, reveals that the ratio of 129 I/I is a sensitive indicator for the influence of nuclear fuel reprocessing facilities. Rivers with point sources for 129 I in their watersheds are drastically affected, while all rivers sampled show evidence for atmospherically transported 129 I from the world's major nuclear fuel reprocessing facilities. Varying mixtures of oceanic cyclic salt and soil‐derived iodine account for the observed spatial variation in iodine concentrations. A comparison of 129 I concentrations in river and rainwater reveals concentration effects due to evapotranspiration.
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Moran et al. (2002) studied this question.
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