A delta-phase (fcc) stabilised plutonium alloy will retain typical metallic characteristics of ductility and malleability from ambient temperature to 450 degrees C. The alpha'-phase (monoclinic) which is hard and brittle may be induced to form within the stabilised delta-phase depending on the degree of homogeneity of the alloy and the alloying content, thermal treatment and applied pressure. It is therefore of considerable interest to understand the conditions that will allow alpha'-phase to form and what impact this may have on the delta-phase properties. The scope of this study was to investigate the phase stability of a plutonium 1 at% gallium alloy (Pu-0.274 wt% Ga alloy) following treatment at low temperatures. The transformation of the induced alpha'-phase back to the delta-phase has been reported to occur either by an indirect path via the beta and gamma-phases or via both direct alpha'-delta phase transformation and indirect transformation paths. This work reports how differential scanning calorimetty (DSC) can be advantageously used to differentiate between the different mechanisms and transformation paths. This study also demonstrates that by conducting recovery anneals, inducing isothermal transformation and optimising the heating rates for each transformation, a different mechanism and transformation path may be favoured. Crown Copyright (C) 2014 Published by Elsevier B.V. All rights reserved.