These results are obtained without reference to absorber material properties (except that k appears in the definition of N). However, it is clear that for a material with a given specific heat, c, the lowest required mass will have the lowest Me product. Hence, the design problem is one of selecting (or designing) a material with high specific heat, and high allowable operating temperature to minimize N. Such calculations are carried out in Table 2 for various candidate materials and properties, taking the allowable temperature to be 95% of the "melting" temperature shown and determining the associated minimum transfer units, Nmn. Here, the respective materials are Beryllium, Beryllium Oxide, and Boron [12]; Pyrolytic Graphite [13]; and type AJ-S Graphite [14],
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