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The transmutation of the fission product technetium was studies by neutron irradiations in the High Flux Reactor at Petten. Six metallic rods of pure technetium, distributed over 3 capsules, were irradiated during eight reactor cycles to a total neutron fluence of about 2E26 m{-2}. Post-irradiation examination of four of the rods was performed at three different institutes. Metallographic examinations showed that no changes in the microstructure were visible after the irradiation. Electron probe microanalysis (EPMA) of the radial distribution of ruthenium, the product of the transmutation process, showed an increase from about 6% in the centre to 12-18% near the rim of the pellets. This effect is due to epithermal neutron capture in the rim region. Mass spectrometric analysis of the pellet-average ruthenium concentration showed that the extent of transmutation is about 6-7%.

Additional information

Authors: KONINGS R J M, Netherlands Energy Research Foundation ECN, Petten (NL);STALIOS A D, JRC Karlsruhe (DE);WALKER C T, JRC Karlsruhe (DE);COCUAUD N, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: Article: Journal of Nuclear Material
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