[en] A method is suggested for determination of the thickness of nuclear photoemulsions applied in luminous- and electron-microscopy autoradiography. The method is based on measuring both the speed of sample withdrawal out of the emulsion melt and the thickness of the emulsion layer applied. The emulsion layer is obtained by the slide submergence technique. Using the least square fit the curve was obtained for the dependence of the emulsion applied layer thickness on the speed of sample withdrawal out of the emulsion melt. The proportionality coefficient, k, has been defined, to characterize the emulsion properties. Thus, basing on the emulsion thickness required for the autoradiography system and knowing the k value, it is possible to determine the sample withdrawal speed corresponding to the given thickness. Every type of emulsion has its own k-value which also depends on the batch of the nuclear emulsion used