Samples of 238Pu-doped single-phase ceramics based on cubic zirconia,
Zr0.79Gd0.14Pu0.07O1.93, and
monazite, La0.9Pu0.1PO4, have been studied by
static leach test in distilled water. Before leach test accumulated doses were
(in alpha-decays/m3 x 1026): from 1.6 to 1.7 –
for cubic zirconia; and 1.0 – for monazite. Despite high radiation
damage both phases remained crystalline according to XRD analysis. The results
of static leach tests demonstrate the following Pu normalized mass loss (in
g/m2, 90°C, 28 days): from 0.3 to 0.7 – for
cubic zirconia; and 1.6 – for monazite. These data are discussed in
comparison with results of previous leach tests carried out at lower accumulated
doses.