Abstract
An attempt was made to estimate the degree of impurity of high-purity phosphorus, needed for semi-conductor work. Activation analysis was used as a general method, thus the deviations could be 2± 1 of the true values. After pile irradiation for 42 days the radionuclides produced in the phosphorus were separated chemically. The true activities of the radiochemically pure samples, were determined by a mathematical method, from measurements with a conventional counting assembly. The radionuclides were identified by their chemical and physical properties. In view of the low counting rates, E max of the β-emitters was estimated by means of half-thickness, a method which was found to be excellent in this case.
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