As a part of treatment of low level active waste, co-precipitation of plutonium (Pu) and americium (Am), with thorium oxalate,
from oxalate supernatants generated during plutonium oxalate precipitation has been investigated. A simple method for the
simultaneous removal of both Pu and Am from oxalate supernatants could be developed. This simple process achieves incorporation
of these alpha active nuclides into small volumes of solid matrix from large volumes of aqueous waste.