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介绍了加速器质谱计测定３６Ｃｌ的原理和方法以及应用前景，并对沧州地区第四纪地下水的３６Ｃｌ进行了测定，利用氯同位素确定了沧州地区的咸水成因，同时根据３６Ｃｌ资料计算出该区第四系第三含水组地下水的年龄为２５０ｋａ，第四含水组地下水年龄为３００ｋａ。
The principle and method of accelerator mass spectrometer 36Cl and its application prospects are introduced. The determination of 36Cl of Quaternary groundwater in Cangzhou area is carried out. The causes of salt water in Cangzhou area are determined by using chlorine isotopes. According to 36Cl data, The age of the groundwater in the Quaternary Third Aquifer is 250ka, and that of the Fourth Aquifer is 300ka.