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The absorbed dose in graphite fro m a cobalt·60 gamma·ray source was measured with a spherical air·filled cavity ionization chamber and with two s pherical calorimeters. The ins truments were constructed from hig h·purity graphite . The curre nt per unit mass of air and the absorbed power per unit mass of graphite were determined with uncertainties of 0.40 and 0.17 percent respectively. Whe n the two results are combined the value of Wa lr • ~m is found to be 33.72 electron volts in graphite per ion pair in air, with an uncerta inty of ± 0.14 electron volts.

A comparison of absorbed dose determinations in graphite by cavity ionization measurements and by calorimetry