Analytical calculations of the effective A, Z, density based on the volume ratios of these materials in the composition of the Barrel Calorimeter of the GlueX Project are presented, as well as the resulting radiation length, shower profile development, Moliere radius and critical energy. Comparisons with the Review of Particle Physics numbers and those from other sources are shown, together with detailed explanations of the employed formulae. An overview of general calorimetry concepts, a description of the properties of sampling calorimeters and the expected energy and timing resolutions are also included.
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