Annual effective dose assessment for 226{sup left}Ra and 228{sup left}Ra due to consumption of foodstuffs by Tehran city residents

摘要

A total of 71 samples from 23 different foodstuffs, namely root vegetables (beetroot, carrot, onion, potato, radish and turnip), leafy vegetables (lettuce, parsley, spinach and white cabbage) and lentils, kidneys, soya, eggs, rice, meat, tomato paste, cooking oil, salami, tea, bread, sausage and cubic sugar, were purchased from markets and analysed by gamma spectrometry for their 226{sup left}Ra and 228{sup left}Ra concentrations. The highest concentrations of Ra and 228{sup left}Ra were determined in tea samples with 2000 and 1200 mBq kg{sup}(-1), respectively. The maximum estimated annual effective doses for 226{sup left}Ra and 228{sup left}Ra due to consumption of foodstuffs were determined to be 1.843 and 0.890 μSv, respectively, from bread samples, whereas the minimum estimated annual effective doses for 226{sup left}Ra and 228{sup left}Ra were determined to be 0.016 and 0.028 μSV from lentil and tomato paste samples, respectively.