Correction for the effect of the gaps around the core of an absorbed dose graphite calorimeter in high energy photon radiation

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Abstract
The primary standard which is the basis of the NPL absorbed dose to water calibration service is a calorimeter for the measurement of absorbed dose to graphite. The graphite calorimeter is similar in design to that described by Domen and Lamperti (1974). The gaps around the core of a Domen-type graphite calorimeter have a small but significant effect on the measured dose. Adding graphite to the front of the calorimeter to compensate for the gaps in front of the core minimizes but does not eliminate the effect of the gaps. For the NPL calorimeter the total measured gap correction was +(0.53+or-0.14)% for 4 MV X-radiation, the correction decreasing for higher X-ray energies.

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