Abstract
Procedures are presented for determination of protactinium-231 in uranium ores and mill tailings, water, air dusts, bone ash, and other similar types of samples. Except for bone ash, the samples are dissolved by fusion with anhydrous potassium fluoride in a platinum dish, assuring complete dissolution of the most refractory forms. The fluoride cake is then transposed with sulfuric acid to a pyrosulfate fusion, simultaneously eliminating all fluoride and silicon by volatilization. Protactinium is removed from a hydrochloric acid solution of the pyrosulfate cake either by direct extraction into diisobutylcarbinol or by precipitation with barium sulfate prior to the extraction, depending on the interferences present. Any insoluble sulfates or acids are removed by centrifugation and treated separately. The separated protactinium can then be electrodeposited and determined by either ..cap alpha.. spectrometry or gross ..cap alpha.. counting, or precipitated on barium sulfate for gross counting when equipment for either electrodeposition or ..cap alpha.. spectrometry is not available. The effect of interfering elements is discussed. Directions are also given for purification and standardization of both protactinium-231 and -233 tracers for use in determination of counting efficiencies and chemical yields. 4 tables, 1 figure.
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