isotopesn.同位素名词isotope的复数形式.isotopen.同位素isotope exchange reaction同位素交换反应isotope dilution analysis同位素稀释分析isotope reaction kinetics反应动力学isotope derivative method同位素衍生物法isotope dilution doubling同位素稀释法isotope specific activity同位素比活度isotope separation factor同位素分离因数isotope separation method同位素分离方法isotope tagging detection同位素示踪探测isotope seperator on line在线同位素分离器