Abstract: Gamma ray spectroscopy method and radiochemical method were introduced to detect ¹³⁷Cs. The activity concentrations detected by using the two methods were analyzed through comparison. Then lower detection limit and higher sensitivity was shown in radiochemical method. Gamma ray spectrometry, with acceptable range of results, could be applied on detection of environmental samples. In addition, less time consumed and higher recovery could be achieved by the gamma ray spectrometry, which is important for emergency monitoring.

Key words: gamma ray spectroscopy method, radiochemical method, ¹³⁷Cs, comparison