体外放射線被曝における実効線量当量, 1cm深部線量当量および中軸線量当量の適応に関する考察

概要

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We investigated a practical method for assessing effective dose equivalent, one-cm-depth dose equivalent and mid-line dose equivalent by using personal dosimeters. Film badge, CaSO4-TLD and pocket dosimeter were used as the personal dosimeters. All these dosimeters were put on the chest surface of a Mix-DP phantom. BeO-TLDs were set in the phantom in order to measure depth-dose distributions. The phantom was irradiated to unidirectional or isotropic radiations from 137Cs, 226Ra and 241Am. From the view point of radiation protection practice, we calculated the factors for converting the reading values of dosimeters to effective dose equivalent, one-cm-depth dose equivalent and mid-line dose equivalent. The conversion factors to these dose equivalents were proposed 0.9, 2.0 and 1.1, respectively, from the present experiment. We considered that mid-line dose equivalent was the most appropriate value for external radiation, since it was close to effective dose equivalent and simple to estimate.