Authors:O. Kindel, F. Herrmann, L. Schmidt, and P. Patzelt
In kerosene samples from nuclear fuel reprocessing, iodoalkanes with chain-lengths from C4 to C13 have been identified. The kerosene samples were purified by means of solid-phase extraction. By this method other fission products like125Sb and106Ru were quantitatively removed from the solution. The only remaining radioactive nuclide was thus129I. The iodoorganic compounds in the kerosene from the solvent were enriched from 6000 Bq/L to 100 000 Bq/L129I by vacuum distillation. Chromatographic separation by HPLC, fractionation, and -measurement of the fractions showed that at least one polar and one nonpolar iodoorganic compound were present. Derivatisation of the iodoorganic compounds with, 1,4-diazabicyclo-2,2,2-octane to quatermary ammonium salts and252Cf plasma desorption mass spectrometry of the products revealed that the main iodoorganic constituents in the kerosene were iodobutane as polar and iodododecane as nonpolar compound in approximately equal concentrations.
Authors:O. Kindel, V. Hoeflich, F. Herrmann, and P. Patzelt
A 10–5 mol 1–1 solutiopn of idododecane in n-dodecane was used to simulate a kerosene sample from nuclear fuel reporcessing. Several methods were developed for the quantitative removal of iodododecane from the n-dodecane solution. Decomposition to elemental iodine was achieved either by washing with hyperazeotropic nitric acid or by exposure to a high-intensity UV-light. Quantitative removal of iodododecane from n-dodecane was achieved by absorption on silver nitrate impregnated materila or on activated charcoal, which was impregnated with potassium thiocyanate or 1,4-diazabicyclo-2,2,2-octance. The reaction could be accelerated by stirring or heating. Thus a quantitative absorption of idododecane could be achieved within a few minutes. The results of the experiments were confirmed by absorption of iodoorganic compounds from kerosene of the Karl sruhe nuclear fuel reprocessing plant (WAK) on the tested material.
Authors:R. Esterlund, D. Molzahn, R. Brandt, P. Patzelt, P. Vater, A. Boos, M. Chandratillake, I. Grant, J. Hemingway, and G. Newton
According to calculations of NIX and others, the formation of superheavy elements might occur in heavy-ion reaction systems
such as the one under investigation in the present work i.e.,238U+63,65Cu at 9.6 MeV/nucleon. Since previous experiments have indicated that upper limits to the production cross-section for superheavy
elements are extremely low, we have carried out two rather long irradiations of 27 hrs and 42 hrs, respectively, at the University
of Manchester LINAC. The first run has already been reported on in the literature. In the case of the second run, after chemical
separation into HgS, CdS, and La(OH)3 fractions, the samples were assayed simultaneously and continuously over a period of 6 months for alpha-and spontaneous-fission
activity, using Si surface-barrier detector. Each sample was at the same time mounted on mice, for the purpose of scanning
for fission tracks at a later date. No indications from the data have so far been found that superheavy elements were produced.