Experimental Approach to Application of Effective Dose Equivalent, One-cm-Depth Dose Equivalent and Mid-Line Dose Equivalent to Radiation Protection Practice

Abstract

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.