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The activity concentrations of natural radionuclides 226Ra, 232Th and 40K in bauxite ore, alumina, dross tailing, aluminium scraps and soil samples collected from an aluminium industry in Nigeria were determined by gamma ray spectroscopy method. The mean values of 226Ra, 232Th and 40K content of the samples ranged from 16 ± 6 (alumina) to 31 ± 10 (scrap), 41 ± 0.12 (scrap) to 134 ± 21(bauxite) and 47 ± 14 (bauxite) to 354 ± 8 (scrap) Bq·kg-1, respectively. The mean activity concentrations of 226Ra and 40K in all the samples are lower than the world average for soil while 232Th is higher with the exception of alumina and scrap. As a measure of radiation hazard to the occupational workers and the members of the public, the radium equivalent activities and external gamma dose rates due to the radionuclides at 1 m above ground surface were calculated. The radium equivalent activities which varied between 88 ± 10 (alumina) and 222 ± 34 (bauxite) Bq·kg-1 are within the safety recommended limit of 370 Bq·kg-1. The mean annual effective doses calculated from the absorbed dose
A 10 y (1999-2008) birth
records from two public and most accessible maternity hospitals locally in
the city of Abeokuta, Nigeria were used to investigate the possible association
of high outdoor gamma radiation exposure on reproductive abnormalities in the
city. From the delivery record of 11,923 births in the period under study, a
total number of 485 incidences of reproductive abnormalities were recoded.
These incidences comprise 228 multiple births, 190 still births and, 67
premature births. Using the available terrestrial gamma radiation exposure data
for the city and different reproductive abnormalities, regression assessment
was carried out using the Pearson Product Moment (PPM) correlation statistics.
The correlation showed that the incidences of reproductive abnormalities and
the radiation dose levels were negatively correlated and correlation
coefficient values were very low for each of the reproductive abnormalities
considered. Factors such as socio-economic potentials of patients, dietary
and other environmental factors may have substantial influence on the
reproductive defects in the area other than radiation. However, the present
study has added to the radiometric information needed in understanding the
relationship between natural outdoor radiation exposure and occurrences of
reproductive abnormalities in areas of high radiation in the country.