Measurement of Absorbed Dose with Calorimeter and Determination of W

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Abstract
A microcalorimeter was used to measure the energy absorbed from beams of Co60 and Cs137 by small cylindrical and pancake absorbers of carbon and aluminum. A true determination of energy absorbed at a "point" in terms of the rad can be made with an absolute accuracy of about 1%. It is recommended that the calorimeter be used as the standard to determine absorbed doses for gamma-ray energies above 1 Mev. Ionization currents in chambers of carbon and aluminum were determined for the same radiation beams. Combining these with the energy absorption measurements and using the Bragg-Gray formula one obtains for Wair the value 33.8 [plus or minus] 0.4 ev/ion pair. A review of comparable determinations by other authors of Wair is given and the results of the present measurements are combined with these to yield an average value for wair of 33.7 [plus or minus] [degree].2 ev/ion pair.
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