Uncertainty evaluation of absorbed dose measurement based on temperature rise using a water calorimeter for 60Co gamma rays
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A water calorimeter has been used to establish the measurement standard of absorbed dose to water for 60Co gamma-ray beams. While heat defect and heat conduction have been thoroughly investigated in previous studies, the uncertainty in temperature rise measurement has not received the same level of attention. This work reevaluated that component, identifying the dominant contributions from type A uncertainty due to repeated irradiation experiments (0.10 %), sensitivity calibration of the bridge circuit (0.075 %), and the extrapolation procedure used to determine signal change (0.07 %). Other sources, such as thermistor calibration and resistance measurements, contributed 0.047 %. As a result, the standard uncertainty of the temperature rise measurement was estimated to be 0.15 %, leading to a combined standard uncertainty of 0.26 % for the absorbed dose to water.
Abstract
A water calorimeter has been used to establish the measurement standard of absorbed dose to water for 60Co gamma-ray beams. While heat defect and heat conduction have been thoroughly investigated in previous studies, the uncertainty in temperature rise measurement has not received the same level of attention. This work reevaluated that component, identifying the dominant contributions from type A uncertainty due to repeated irradiation experiments (0.10 %), sensitivity calibration of the bridge circuit (0.075 %), and the extrapolation procedure used to determine signal change (0.07 %). Other sources, such as thermistor calibration and resistance measurements, contributed 0.047 %. As a result, the standard uncertainty of the temperature rise measurement was estimated to be 0.15 %, leading to a combined standard uncertainty of 0.26 % for the absorbed dose to water.