Origin of Reactor Effluent Water Radioisotopes: 1, The Effect of Turco Purging on the Radioisotope Concentration in Reactor Effluent Water and Radioisotope Deposition on Metal Surfaces
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The concentrations of nine radioisotopes in the effluent water from a chemically cleaned (with Turco 4306B) reactor process tube were followed for 1.5 months. The cleaning process reduced the initial concentration of all of the radioisotopes except Na sup 24 by a factor of 5 to 100, and several of the radioisotopes including As sup 76 and P sup 32 were less than 25% of normal after two weeks of operation. The adsorption of 16 reactor effluent water radioisotopes on metal surfaces downstream from a normal and a chemically cleaned process tube was measured. The amounts of most of these radioisotopes on aluminum and stainless steel surfaces were a factor of two to seven lower for the cleaned than for the normal tube. A smaller difference was observed for the carbon steel. The relative affinity of the metal surfaces for these radioisotopes was found to vary by a factor of about 3 x 10 sup 3 , the most readily adsorbed radioisotopes being the lanthanons and the least readily adsorbed being Np sup 239 . The observed relative concentrations of radioisotopes found on short exposure surfaces (35 days) and long exposure surfaces (15 years) are compared, and the contribution of each radioisotope to the gamma-ray dose of these mixtures is given.
Origin of Reactor Effluent Water Radioisotopes: 1, The Effect of Turco Purging on the Radioisotope Concentration in Reactor Effluent Water and Radioisotope Deposition on Metal Surfaces