Degradation of chlorpyrifos by ionizing radiation |
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Authors: | M. N. Mori H. Oikawa M. H. O. Sampa C. L. Duarte |
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Affiliation: | (1) Radiation Measurement Division, National Research for Agriculture and Animals Resources Center, Riyadh, Kingdom of Saudi Arabia;(2) Radiation Measurement Division, National Research for Agriculture and Animals Resources Center, Riyadh, Kingdom of Saudi Arabia;(3) Radiation Measurement Division, National Research for Agriculture and Animals Resources Center, Riyadh, Kingdom of Saudi Arabia |
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Abstract: | Summary A survey was carried out to determine radioactivity concentrations and associated dose rates from the naturally occurring nuclides 232 Th, 238U and 40K in various surface soil formations of Alhkraje city. Samples were collected from different areas of the study, sieved through a fine mesh, sealed in 0.5-liter plastic Marinelli beaker, and measured in the laboratory for 24 hours each. From the measured g-ray spectra, radioactivity concentrations were determined for 232 Th ranging from 5.32±2.59 to 16.40±2.04 Bq . kg-1, 238U (2.87±0.18 to 18.83±0.81 Bq . kg-1), 40K (211.33±55.04 to 378.97±36.46 Bq . kg-1) and 137Cs (0 to 3.19±1.02 Bq . kg-1). Absorbed dose rates in air doors were calculated to be in the range of 15.29±2.65 to 30.00±3.24 nGy . h-1, the corresponding effective dose rates per person outdoors were estimated to be between 21.00±0.95 to 36.83±2.11 mSν. y-1, assuming a 20% occupancy factor. |
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