Abstract
A method to determine the reactivity worth of material samples within an undisturbed environment by a pile oscillator is described. In contrast to the usually performed pile oscillator measurements the oscillator rod consists of a tube filled with the material of the environmental core in which the sample is embedded. By this method, perturbations of the real and adjoint spectra, and of the angular neutron distribution are considerably reduced. A simple, theoretical model that describes the kinetic behaviour of the reactor during the oscillation is presented. The method and the theoretical model have been investigated on the Fast-Thermal Argonaut Reactor STARK. Results show the benefits of the proposed procedure and the applicability of the model.
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