Cesium has only one naturally occurring stable isotope, 133Cs.
The radiogenic isotope 137Cs has been used in hydrologic studies,
analogous to the use of 3H. 137Cs is produced from
detonation of nuclear weapons and emissions from nuclear power plants.
Beginning in 1954 with the commencement of nuclear testing, 137Cs
was released into the atmosphere where it is absorbed readily into solution.
Once 137Cs enters the ground water, it is deposited on soil
surfaces and removed from the landscape primarily by particle transport.
As a result, the input function of these isotopes can be estimated as a
function of time. The resulting activities of 137Cs in sediments
can thus be used to understand the geomorphic history of catchments by
dating cores and estimating rates of sediment deposition and thus catchment
134Cs has also been used in hydrology as a measure of cesium
output by the nuclear power industry. This isotope is used because, while
it is less prevalent than either 133Cs or 137Cs,
134Cs can be produced solely by nuclear reactions. 135Cs
has also been used in this function.
134Cs and 135Cs, while less prevalent than either
133Cs or 137Cs, have also been used in hydrology
as a measure of cesium output by the nuclear power industry, as they too
are produced solely by anthropogenic sources.
Source of text: This review was assembled by Eric Caldwell
and Dan Snyder from the references below.
||Bierman, P.R., Albrecht, A., Bothner, M., Brown, E.T., Bullen, T., Gray,
L.B. and Trupin, L. (1998). "Erosion, Weathering and Sedimentation."
In: C. Kendall and J.J. McDonnell (Eds.), Isotope Tracers in Catchment
Hydrology. Elsevier, Amsterdam, pp. 647-678.
||Brauer, F. P., and Ballou, N. E. (1975). "Isotopic ratios of iodine
and other radionuclides as nuclear power pollution indicators", In:
Isotope Ratios as Pollutant Source and Behaviour Indicators, International
Atomic Energy Agency, Vienna.
||Krishnaswami, S., Lal, D., Martin, J.M. and Meybeck, M. (1971). "Geochronology
of lake sediments." Earth and Planet. Sci. Lett., 11:
||Ritchie, J.C., Spraberry, J.A. and McHenry, J.R. (1974). "Estimating
soil erosion from the redistribution of fallout 137Cs."
Soil Sci. Am. Proc., 38: 137-139.
||Schell, W. R., and Nevissi, A. (1983). "Sedimentation in lakes
and reservoirs", in Guidebook on Nuclear Techniques in Hydrology,
1983 Edition, International Atomic Energy Agency, Vienna. pp. 163-176.
||Walling, D. E., He, Q., and Quine, T. A. (1995) "Use of caesium-137
and lead-210 as tracers in soil erosion investigations." In: Ch. Leibundgut
(Ed.), Tracer Technologies for Hydrological Systems, Galliard, Great