Abstract
A description is given of work carried out to determine the optimum condition for maximum extraction of a number of alpha emitting radioactive elements with dinonyl naphthalene sulfonic acid from urine dissolved in perchloric acid. The extraction yield of plutonium, thorium, uranium, and their mixture is about 90% using this procedure. Emphases are given to the acidic effect of the aqueous phase, the concentration effect of the organic phase, and the shaking and the settling time.
