一、引言在石油、化工、煤炭、冶金、地质、造纸、食品等各工业部门,γ射线密度计已获得越来越广泛的应用。特别是在橡胶生产自动化方面,γ射线密度计的应用有着十分重要的意义。西德Bunawerke Hiils丁苯橡胶厂,采用密度计自动测量转化率,实现了聚合过程的自动控制。美国Goodye_Mar轮胎和橡胶公司,Firestone合成橡胶 I. Introduction In the petroleum, chemical, coal, metallurgy, geology, papermaking, food and other industrial sectors, the gamma ray density meter has been more and more widely used. Especially in rubber production automation, the application of γ-ray density meter is of great significance. West Germany Bunawerke Hiils SBR plant, automatic measurement of the conversion rate using a densitometer, to achieve the polymerization process of automatic control. United States Goodye_Mar Tires and Rubber Company, Firestone synthetic rubber