Shikata E, Kase T
Radioisotopes. 1978 May;27(5):229-34. doi: 10.3769/radioisotopes.27.5_229.
Potassium chloride was subjected to various kinds of pretreatments and irradiated in a nuclear reactor. Irradiated potassium chloride was dissolved in deaerated aqueous solution of several sulfur-salts. A portion of the solution was chromatographed on a thin layer chromatographic plate and the distribution of 35S-chemical species was determined. Irradiation of potassium chloride degassed at 3x10(-4)Torr resulted in the formation of about 60% of 35S in the form of thiosulfate and remainder was distributed among sulfide, sulfate and elementary sulfur. Thiosulfate[35S] was converted to elementary sulfur[35S] first by reducing to hydrogen sulfide [35S] with nascent hydrogen and then by oxidizing the latter to elementary sulfur[35S] with hexacyanoferrate(III). Elementary sulfur[35S] was finally extracted into benzene. Radiochemically pure elementary sulfur[35S] could be produced by simple procedures with a yield of about 60%. Thiosulfate[35S] was decomposed with acid to elementary sulfur[35S] and sulfur[35S] dioxide. The former was separated by centrifuging and dispersed in boiling water to form colloidal suspension of elementary sulfur[35S]. Approximately 40% of 35S was recovered as colloid.
氯化钾经过各种预处理后在核反应堆中进行辐照。辐照后的氯化钾溶解于几种硫盐的除气水溶液中。将一部分溶液在薄层层析板上进行色谱分析，并测定(^{35}S)化学物种的分布。在(3\times10^{-4})托下脱气的氯化钾辐照后，约60%的(^{35}S)以硫代硫酸盐的形式形成，其余部分分布在硫化物、硫酸盐和单质硫之间。硫代硫酸盐([^{35}S])首先通过与新生氢还原为硫化氢([^{35}S])，然后用铁氰化铁(III)将后者氧化为单质硫([^{35}S])，从而转化为单质硫([^{35}S])。单质硫([^{35}S])最终被萃取到苯中。通过简单的步骤可以生产出放射化学纯的单质硫([^{35}S])，产率约为60%。硫代硫酸盐([^{35}S])用酸分解为单质硫([^{35}S])和二氧化硫([^{35}S])。前者通过离心分离，分散在沸水中形成单质硫([^{35}S])的胶体悬浮液。约40%的(^{35}S)以胶体形式回收。
