[en] A systematic study of some of the parameters that may affect sorption of radionuclides in geologic media is reported. All studies were made on three media, a quartz monzonite, an argillite, and several lithologic varieties of tuff. The nuclides studied were ⁸⁵Sr, sup(95m)Tc, ¹³⁷Cs, ¹⁴¹Ce, ¹⁵²Eu, sup(237,239)Pu, and ²⁴¹Am. The parameters studied were time, temperature, exchange capacity, available surface area, particle size, element concentration, groundwater composition, and of course, mineralogy. Sorption tends to increase somewhat with time. Particle size and available surface area are important for granitic-type materials. The dependence of the amount of sorption on temperature depends on the system studied. Sorption of technetium (VII) and uranium (VI) is generally low except when fine sieve fractions are used. A proper method for making batch measurements was developed, in which the solid and aqueous phases are assayed for radioactivity. Detailed studies of the behaviour of plutonium and americium in aqueous solutions at pH approximately 8 were made. (author)