disclosed is a method for the measurement of a cellular process , or for the measurement of the effect of a test compound on a cellular process , in one or more different populations of cells . the method comprises providing separate samples of one or more different populations of cells adhering to support particles , the support particles comprising a scintillant substance and being adapted for cell growth . in one embodiment , different samples of cells are introduced into separate reaction vessels in a fluid medium , together with a reagent labelled with a radioisotope , in the presence or the absence of the test compound , under conditions so as to cause a portion of said radiolabelled reagent to become associated with the cells . in another embodiment , multiparameter analysis may be performed to determine the effect of a test compound on a cellular process using two or more different cell populations present in the same well . measurement of the cellular process , or the effect of a test compound on a cellular process may be made by detecting light emission from the scintillant particles caused by radioactive decay of the radioisotope .