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Abstract  

Experimental arrangements and problems encountered in employing radioisotope X-ray fluorescence technique are described. Basic equations for an estimation of fluorescent and scattered radiation are discussed. By means of examples obtained in the field of environmental analysis and industry the applicability of radioisotope X-ray fluorescence analysis is shown and the need for further research and developments pointed out.

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Abstract  

Results are given which have been obtained by the application of relatively small252Cf sources for the neutron-activation analysis of vanadium in oils. It could be shown that by optimization the geometrical conditions for activation and counting with a 24 μg252Cf source detection limits down to the order of 1 ppm vanadium are attainable; the absolute error, e.g., at 1.3 ppm is 0.32 ppm.

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Abstract  

An application of distribution coefficients in transport models must take into account, among others, influences of solution-to-solid (V/M) ratios. Therefore, with batch tests the dependence of sorption and desorption coefficients on V/M in rock-groundwater systems of the Gorleben site was investigated. Experiments show that sorption (RS) and desorption (RD) coefficients of Ra, U, Pa and Ac decrease with decreasing liquid/solid ratios. In order to understand the V/M-effect sorption isotherms for different V/M ratios and, moreover, quantities for characterizing specific sorption of nuclides have been measured. The results allow the postulation of a model for describing approximately RS-V/M-relationships of different nuclide/rock/groundwater system with specific parameters.

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The use of differential scanning calorimetry in chemical education

II. A graduate experiment; the melting behaviour of ultra-high molecular weight polyethylene fiber

Journal of Thermal Analysis and Calorimetry
Authors:
G. van der Plaats
,
H. Aben
,
L. Meier
,
O. Scherrer
, and
R. Truttmann
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