Direct determination of cesium in pilot plant effluents by isotope dilution mass spectrometry Page: 4 of 26
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SLIDE 7 Cesium is monoisotopic in nature (133Cs). Thus, only
radioactive isotopes are available for isotope dilution analyses.
The 135Cs isotope with a half-life of 2 x 106 years would be
preferred, but it is not available as a separated isotope.
Therefore, the more-active 137 Cs isotope with a half-life of
30.1 years must be used. The most-enriched mixture available
was 35% 137Cs material from Oak Ridge, which had a 133/137 mass
SLIDE 8 ratio of 1.43. Two spike solutions were prepared from the Oak
Ridge material, one with about 0.3 ppb 137Cs and the other with
about 3 ppb 137Cs. The 133/137 mass ratios increased to 11 and
2.6, respectively, because of natural cesium contamination.
The high thermal ionization efficiency of cesium allows us
to limit the amount of radioactive cesium we use. In our method,
10 mm3 of sample are mixed with 10 mm3 of spike, and about half
of the solution is loaded into the mass spectrometer. Thus, the
total amount of 137Cs is about 3 or 30 pg per sample, depending
on which spike solution is used.
These spike solutions and pure cesium standards were used
SLIDE 9 to determine the sensitivity, precision, linearity, and bias of
this isotope dilution method. Replicate 10 mm3 portions of the
0.28 ng/cm3 spike showed a relative error of 0.68 ratio units at
the 95% confidence level. This is equivalent to a random error
of 0.2 ng/cm3 (ppb) in the cesium concentration at the 1 ng/cm3
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Chastagner, P. Direct determination of cesium in pilot plant effluents by isotope dilution mass spectrometry, article, January 1, 1980; Aiken, South Carolina. (digital.library.unt.edu/ark:/67531/metadc1052688/m1/4/: accessed January 20, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.