A method is presented for analysis of occupational dose distributions influenced by the effect of dose limits so that they deviate from the often-observed lognormal distribution in the high-dose range. It is based on a hybrid lognormal distribution, derived from realistic assumptions of exposure mechanisms. The properties of the hybrid lognormal distribution and methods of estimating its parameters from the observations are given. The method is applied to analysis of occupational radiation exposures reported by the U.S. Nuclear Regulatory Commission. These exposure data are shown to be far better fitted by a hybrid lognormal distribution than by a lognormal one. The applicability of the hybrid lognormal distribution to analysis of occupational exposure is discussed.
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