Abstract
Six marked brands of black tea (S1, S2, S4, S5, S6, and S7) and one type of green tea (S3) which commonly consumed in Egypt, were collected from local markets. The total alpha and beta gross activities in different tea samples were measured. The annual effective dose (mSv/y) for both total alpha and beta gross activities (Bq/2 gm) related to different types of tea drink corresponding to each radionuclide was calculated based on the dose conversion factors. The qualitative and quantitative assessment of tea sample S1 supplied from Ceylon proved the presence of different naturally occurring radionuclides. Also, the total contents of heavy metals in different types of tea were measured and the data obtained show the ability of them to accumulate the heavy metals, particularly Mn and Fe. The results of metal contents in infusion of different types of tea show that the concentration values of Mn for the all types were the highest concentration values and the concentration levels of Cu were the lowest concentration values. The studied heavy metals could be arranged in descending order according to their contents in tea brew as the following Mn > Fe > Zn > Cu > Pb.