Abstract

Abstract The main aim of this study is to determine the activity concentrations of uranium series and thorium series radionuclide in crops cultivated in Upper Egypt. Fifteen types of cereal crops were collected from local markets and analyzed by γ-ray spectrometry. The mean activity concentrations of the natural radionuclides 238 U, 226 Ra and 232 Th were 0.67, 1.27 and 0.56 Bq·kg -1 , respectively. The annual effective doses from these radionuclides were estimated for different age groups. Key words Cereal crops, Gamma spectrometer, HPGe detector, Annual committed effective dose, Age groups 1 Introduction The concentration of natural radionuclides in the environment and man is especially important in areas where the radionuclide concentrations are elevated or enhanced as a result of human activity. The purpose of this study was to evaluate the intake of 238 U, 226 Ra and 232 Th with crops by inhabitants of the Qena region in Egypt. In this area the mean values of 232 Th and 226 Ra in soil are 13.7±7, and 12.3±4.6 Bq kg

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