Isolation and alpha-particle spectrometric determination of 238Pu and 239,240 Pu in sediments / S.R. Joshi. : En13-5/85-79E-PDF

"The title radioisotopes are introduced into the environment as a result of nuclear weapons testing (Pu-239,240) or due to satellite burnup in the atmosphere (Pu-238). However the possibility exists that all these may also reach aquatic environment due to nuclear fuel reprocessing activities such as those carried out until 1972 in West Valley, NY. In order to assess the significance of the latter, a technique was required to analyze sediment cores(from Lake Ontario at the mouth of Niagara River) for the presence of these radioisotopes. The present article describes the simple method developed for this purpose. The technique employs simple extraction with nitric acid prior to ion—exchange separation. A novellanthanum fluoride co-precipitation step eliminates conventional, expensive and time-consuming electro-deposition technique. In addition the described procedures also permit simultaneous determination of six thorium and uranium isotopes"--Exec. summary.

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