双重造影用硫酸钡制剂的研究和应用,已有文献报道。我们从1976年5月开始对超微粒硫酸钡进行了实验研究,现将结果报道如下。超微粒硫酸钡的合成我们采用工业用氯化钡和硫酸钠为原料经如下处理即可制成超微粒硫酸钡。称取上述两种原料各25kg,分别按0.2%(w/w) 加入活性炭。在氯化钡中加浓硝酸200ml 和常水50l,使氯化钡溶液成50%浓度后,加温至80～90℃使其溶解后过滤。滤液以稀盐酸 Double contrast barium sulfate preparation and application, has been reported in the literature. We started from May 1976 on the experimental ultrafine barium sulfate, the results are reported below. Ultrafine barium sulfate synthesis We use industrial barium chloride and sodium sulfate as raw materials can be processed by the following ultrafine barium sulfate. Weigh the two raw materials of 25kg, respectively, according to 0.2% (w / w) added activated carbon. In barium chloride plus concentrated nitric acid 200ml and 50l of water, the barium chloride solution to 50% concentration, heated to 80 ~ 90 ° C to dissolve and filtered. The filtrate to dilute hydrochloric acid