This study summarizes the usual management of radioactive liquid wastes from hospitals, including conventional and recent treatments applied. This is the case of liquid wastes from radioimmunoassay (RIA), a laboratory technique that allows to determine human substances in very low concentrations (below 10 -12 g/mL), like hormones, using 125I as radionuclide. Therefore, these wastes have to be treated and condition before discharge in spite of activity decay below discharge limit. In some cases, radioactive wastes have other hazards, such as chemical or biological ones, which can be more dangerous than radiological hazard, and do not allow direct discharge into sewage in spite of decaying activity below the clearance level. The most usual management of these wastes is temporary storage at the hospital for radioactivity decay and, then, discharge into sewage if not other pollutants are present in waste, always after authorization of the corresponding institution. Radioactive liquid wastes are produced at hospitals from diagnostic and therapeutic applications of radionuclides.
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