The International commission on radiological protection has recently approved a new model of the human respiratory tract. This model has been designed to represent realistically the deposition and biokinetic behaviour of inhaled radionuclides, and to calculate doses to the respiratory tract. In order to examine the practical application and radiological implications of the new model, a personal computer program has been developed. LUDEP 1.0 (LUng Dose EvaluationProgram) is a user-friendly program for the IBM-compatible PC which enables the user to calculate doses to the respiratory tract and to other organs.
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