Studies on environmental radioactivity radioprotection in Brazil

This work presents the results of the continuous environmental survey programmes carried out by the Radio-Ecological Coastal Laboratory (LARELI) of the Sao Paulo State Agency for the Coordination of Special Projects (COPESP). Artificial radionuclides in marine samples were routinely monitored through the laboratory's research monitoring programme since 1990. Some examples of analysis carried out in our laboratory are discussed, mainly as large samples volumes are required. Marine samples (seawater, fish) are collected monthly of the Brazilian coast between the State of Rio Grande do Sul (latitude 320 11'S) and the state of Para (latitude 000 26'S), evaluating the artificial radionuclide concentration. Data are used to describe the radio-ecological situation along the Brazilian coast to obtain radionuclide reference levels, as well as data for estimating the exposure of our population to fallout radionuclides. This information is used as a base for detecting any future contamination. The main origin of the radionuclides detected are nuclear device test in the atmosphere and accidents (like Chernobyl) in the northern hemisphere. (author). 6 refs., 1 fig., 3 tabs