Abstract
Radon exhalation rates from five studied laboratory waste samples resulted from five different sedimentary rock types named sandy dolostone, siltstone -two samples-, marly claystone and black shale were measured using ''Sealed Can technique". These rates were found to vary between 0.005 and 0.015 Bq m
−2
h
−1
. A positive correlation was found between the radon exhalation rates and the radium activities. The emanation coefficients were calculated for these laboratory waste samples which varied between 0.0004 and 0.0007 according to the physical and chemical characterize of the wastes. These results are partially in accordance with autonite acid leached tailings on laboratory scale (USA). These results led us to pay attention about the effect and impact of these wastes on the environment.