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\subsection{Energy dependence on attenuation}  Measurement of the attenuation coefficient for a series of materials of differing density was performed over a range of gamma ray energies. The materials analysed were lead, polyethylene (PE), aluminium and steel. Lead and PE discs of differing thicknesses were used, whilst sheets of steel and aluminium were added to record to attenuation of a variety of thicknesses. This process was repeated for each source. Table ### shows the corresponding energies and sources that were used in this study. The mass attenuation coefficient was also recorded using density values provided by NIST.  Each sample was recorded for 60 seconds using the parameters specific for the source, where the resultant parameters are outlined in the results section. Samples were also subject to the Grubbs test prior to processing (at g<0.05).