The aim of this proposal is to measure inelastic neutron spectra using the TOSCA instrument for a series of samples of the widely used secondary explosives RDX and HMX. During a previous scoping experiment, we obtained INS spectra of several samples of RDX known to have varying sensitivities. The results obtained provide tantalising evidence that INS may be a valuable non-destructive technique to distinguish between samples of RDX with differing shock sensitivity. This proposal seeks to develop a quantitative, non-destructive method for distinguishing between the sensitivities of RDX samples, including samples that have previously been damaged in some way. At the same time, the results will provide insight into energy transfer mechanisms involved in initiation processes.