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利用加速器质谱仪和高精度热离子质谱仪对沧州地区地下水的宇宙成因核素３６Ｃｌ以及稳定同位素３７Ｃｌ／３５Ｃｌ进行了测试，并利用氯同位素有效地确定了沧州地区咸水成因．同时，根据３６Ｃｌ资料计算出该区第四纪第三含水组（Ｑ２）地下水３６Ｃｌ年龄为２５０ｋａ，第四含水组（Ｑ１）地下水３６Ｃｌ年龄为３００ｋａ．
The cosmogenic 36Cl and 37Cl / 35Cl stable isotopes of groundwater in Cangzhou were tested by accelerator mass spectrometry and high-precision thermal ionization mass spectrometry. The formation of salt water in Cangzhou was effectively determined by using chlorine isotopes. At the same time, the 36Cl age of the groundwater in Quaternary Third Water Group (Q2) is 250ka and the 36Cl age of the groundwater in the Fourth Water Group (Q1) is 300ka.