Abstract
The first comparison of national standards of absorbed dose for 60Co gamma radiation has been carried out by the Laboratoire de Métrologie des Rayonnements Ionisants (LMRI) and the National Bureau of Standards (NBS). The graphite calorimeters were compared in the LMRI 60Co gamma-ray beam. The ratio of the response of the NBS calorimeter to the LMRI calorimeter was 1.003, with a 95% confident limit of ±0.6%, and an estimated upper bound to the systematic uncertainties of ±0.3%.
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