Evaluation of 226Ra, 232Th, 137Cs and 40K " Agaricus Bisporus" Activity in Cultivated Edible Mushroom formed in Tehran Province- Iran

Natural and man made radioactive sources exist in our environment they can enter into our food chains. One of these is the soil-mushroom-human chain. High level doses of natural radiation can cause hazards to humans. Samples of Agaricus bisporus cultivated edible mushroom in Tehran province- Iran were collected from 7 farms. Specific activity of 226Ra, 228Ra, 137Cs, 40K and 235U of the samples were measured by two HPGe detectors. Specific activity of 226Ra, 228Ra, 137Cs and 40K in the edible mushroom samples were equal to 0.06 ± 0.03 - 0.7 ± 0.2 Bq kg-1 dry, 1.4 ± 0.7 Bq kg-1 dry, 0.1 ± 0.03- 0.3 ± 0.1 Bq kg-1dry and 920 ± 400 - 1370 ± 900 Bq kg-1dry, respectively. As the measured concentrations of the radionuclides of interest are close or lower than MDA (Minimum Detectable Activity). Consumption of the mushrooms would impose no health consequences to the consumers.