Abstract: Radon exhalation rates were measured from building
materials on the Garyounis University campus by using the can technique,
containing CR-39, to estimate the radiation exposure in the atmosphere. The
radon concentration from brick walls, marble ledges, and ceramic floors was
found to vary from 107.8 \pm 3.6 to 277.9 \pm 9.3 Bq m^-3 with a mean
of 172 \pm 5.8 Bq m^-3, 100.0 \pm 3.3 to 298.7 \pm 10.0 Bq
m^-3 with a mean of 174.5 \pm 5.8 Bq m^-3, and 87.0 \pm 2.9
to 275.3 \pm 9.2 Bq m^-3 with a mean of 145.1 \pm 4.9 Bq
m^-3, respectively. The average radon exhalation rate from the brick
walls and marble ledges showed approximately the same value, which was higher
than that of the ceramic floors by more than 15{%}. The levels of radon
concentrations caused by these construction materials in 15 work places were
found to be relatively low, giving an annual exposure dose within the
internationally recommended range.