In general, the trend of Raeqin the soil samples was found to
mirror the mean ACs, as did the calculated external gamma-ray
dose rate (D) for the samples. The ash samples showed the highest
average dose rate with 143.3 nGy/h, whereas surface soil collected
near the power plant (S3) showed the highest dose rate associated
with soil, at 112.1 nGy/h. The calculated committed effective doses
for the studied samples followed the similar trend to their average
activities as presented inTables 6and7. The highest committed
effective dose in the case of soil samples was found for the
activities measured in surface soil samples S3 (collected near to
the power plant), while samples S6 (collected from inhabited and
rural grass land areas) showed the lowest. The maximum committed effective dose for the respective S3 soil samples was
projected to be 5.3mSv for 1 year of ingestion, 240mSv for 1 year
of inhalation, 23mSv for 30 years of ingestion and 5.6 mSv for 30
years of inhalation, obtained assuming that all the radionuclides
were taken in by adults. Even under extreme intake situations the
accumulated doses would still be very small, as for example
220mSv and 6.1 mSv for inhalation intake of pure bottom ash
following a period of exposure of 1 year and 30 years, respectively