This report describes a test performed on April 2, 1947 to determine the reactivity power coefficients and the graphite relaxation period of the F Pile in accordance with the procedure described by this Production Test.

It was desired to investigate the precipitation of UO{sub 4} in acid solution, in order to determine the suitability of this reaction for use in the purification of uranium. A series of tests was performed to establish the conditions for precipitation of UO{sub 4}. It was found that uranium could be completely precipitated from pure uranyl sulfate solution at a pH of 2.5 to 3.5, with only silght excess of H{sub 2}O{sub 2}. The presence of sodium sulfate interferred with complete precipitation. It was established that vanadium was preferentially oxidized, when present.

Report is made of chemical procedures for determination of plutonium in human urine. The procedures are provided in outline form and statistical methods are provided for interpretation of the results.