Production of ³⁵S by the neutron irradiation on potassium chloride. Separation of ³⁵S by the combined method of precipitation and anion exchange

Ten grams of the neutron-irradiated potassium chloride were dissolved in 20 ml of boiling water, which contained 10 mg of phosphate. Sixty milliliters of ethanol were added to the solution. After being cooled to room temperature potassium chloride precipitate was filtered off. The filtrate was diluted by the addition of 300 ml of water and passed through an anion exchange resin column in chloride form. The column was washed with water. ³²P was eluted with 0.05 N hydrochloric acid and then ³⁵S with 2 N hydrochloric acid. Various conditions of the separation and the quality of ³⁵S prepared by this method were investigated. By the pre-treatment with ethanol prior to the anion exchange separation, the K_d value of ³⁵S(³⁵SO₄^2-) against the anion exchange resin was increased without increasing the volume of the solution and the separation was made easily. The specific activity of ³⁵S prepared by this method was about ten times as high as that prepared by the cation exchange method. The percentage of ³⁵S recovered was about 80%. The separation factor against ³²P formed simultaneously by the neutron irradiation was 1.3 x 10⁴ at maximum. (author)