Simplified, laboratory scale systems, namely ordinary laboratory desiccators and cylindrical containers were tested with regard to their reliability as exposure systems for determining certain parameters of radon emanation from locally obtained crushed granite rock samples. The samples were placed inside the exposure systems. Activity concentration of emanated radon in the exposure systems air increased with increase of mass of granite sample in the desiccator and with length of the exposure period. Activity concentration of radon was high near the granitic source but decreased with vertical distance from it when the exposure system was semiclosed but activity was homogeneous when the system was completely closed. The cylindrical exposure system was used in assessing Ra-226 content in some crushed granitic samples identified as altered alkali granite and found to be: 0.024 Bq g−1 (0.65 pCig−1). Rn-222 emanation rate from the same samples was: 0.013 Bq m−2 s−1 (0.34 pCi m−2 s−1). Saturation density thickness for a mixed sample of pure and alkali granites was found to be 116 g cm−2. The results agree in general with reported observations and support the reliability of the exposure systems used.