[en] In the countrywide contrasting survey of ¹⁵⁵Eu activity, ¹⁵⁵Eu liquid activity was determined for the first time through using liquid scintillation spectrometer survey ¹⁵⁵Eu β ray. In survey total uncertainty, determining activity accord with determining activity average value of all a wide variety of survey instrument entering into contrasting survey. But using liquid scintillation spectrometer survey, it is simple and save time, is beyond compare for other survey method. It indicate liquid scintillation spectrometer survey β-γ nuclide activity is effective as well