Determination of 40K, 232Th and 238U activity concentrations in ambient PM2.5 aerosols and the associated inhalation effective dose to the public in Jeddah City, Saudi Arabia.
Natural radioactivity of soil samples has been studied in many countries of the Arabian Peninsula, including Saudi Arabia. Radiological indices based on soil radioactivity have been widely used in these studies. However, there are no available data about natural radioactivity of fine aerosol particles in such countries. The objective of this study is to determine the activity concentrations of (40)K, (232)Th and (238)U in airborne PM2.5 and the associated internal inhalation radiation dose to the public in Jeddah City, Saudi Arabia. Twenty-four air samples in four locations throughout Jeddah were collected and analyzed for PM2.5 and the associated K, Th and U. The activity concentrations of the isotopes (40)K, (232)Th and (238)U were calculated. High atmospheric PM2.5 concentrations (mean: 50.81 ± 34.02 μg/m(3)) were found. The natural radioactivity associated with PM2.5 due to the isotopes (40)K, (232)Th and (238)U were 301.8 ± 76.1, 11.8 ± 4.2 and 10.8 ± 3.4 Bq/kg, respectively, and the Raeq was calculated as 44.9 ± 14.0 Bq/kg. The inhalation annual effective radiation dose to the public due to natural isotopes of the airborne PM2.5 was in the range 15.03-58.87 nSv/year, depending on the age group. Although these dose values were associated with the PM2.5 fraction only, they were higher than the world references values in air reported in the UNSCEAR, 2000 report.
Department of Industrial Engineering, Faculty of Engineering, King Abdulaziz University, P.O. Box 80204, Jeddah 21589, Saudi Arabia; Department of Occupational Health and Air Pollution, High Institute of Public Health, Alexandria University, Alexandria, Egypt. Electronic address: mzytoon@kau.edu.sa.
Mohamed A
MA
Zytoon
Department of Industrial Engineering, Faculty of Engineering, King Abdulaziz University, P.O. Box 80204, Jeddah 21589, Saudi Arabia.
Hani M
HM
Aburas
Department of Chemical and Materials Engineering, Faculty of Engineering, King Abdulaziz University, Jeddah, Saudi Arabia.
Mohammed I
MI
Abdulsalam
D000293:Adolescent; D000328:Adult; D000336:Aerosols; D000396:Air Pollutants, Radioactive / Q000032:analysis*; D002648:Child; D002675:Child, Preschool; D006801:Humans; D007223:Infant; D019570:Inhalation Exposure / Q000032:analysis*; D010316:Particle Size; D052638:Particulate Matter / Q000032:analysis*; D011197:Potassium Radioisotopes / Q000032:analysis*; D011829:Radiation Dosage; D011834:Radiation Monitoring; D012529:Saudi Arabia; D013910:Thorium / Q000032:analysis*; D014501:Uranium / Q000032:analysis*
D000336:Aerosols; D000396:Air Pollutants, Radioactive; D052638:Particulate Matter; D011197:Potassium Radioisotopes; D014501:Uranium; D013910:Thorium
Airborne PM(2.5); Inhalation radiation dose; Jeddah; Natural radioactivity