The evaluation of gross alpha and beta activities in crude oil contaminated soil, sediment and water samples was conducted in ten oil polluted environment of Delta State using Gas-flow proportional counter. Samples we...The evaluation of gross alpha and beta activities in crude oil contaminated soil, sediment and water samples was conducted in ten oil polluted environment of Delta State using Gas-flow proportional counter. Samples were collected from the oil polluted environment in each oil field and samples were prepared and analyzed following standard procedures. The mean gross alpha and beta activities obtained are 331.4 ± 24.5 Bq kg<sup>-1</sup> and 11,335 ± 112 Bq kg<sup>-1</sup> respectively for soil, 259.2 ± 17.6 Bq kg<sup>-1</sup> and 4508 ± 96 Bq kg<sup>-1</sup> respectively for sediment, and 1.00 ± 0.09 Bq kg<sup>-1</sup> and 20.3 ± 1.7 Bq kg<sup>-1</sup> respectively for water. The estimated average values of the total annual effective dose equivalent (<i>AEDE</i><i><sub>T</sub></i> (<i>α,β</i>)), the total annual gonadal dose equivalent (<i>AGDE</i><i><sub>T</sub></i> (<i>α,β</i>))), and the total excess lifetime cancer risk (<i>ELCR</i><i><sub>T</sub></i> (<i>α,β</i>)) are 10.64 mSv y<sup>-1</sup>, 0.037 μSv y<sup>-1</sup> and 0.037 μSv y<sup>-1</sup> respectively. The gross alpha and beta activities values obtained in soil and sediment were relatively high compared to values reported in some parts of the country and other regions and countries of the world. The radiological risk parameters examined show that <i>AEDE</i><i><sub>T</sub></i> (<i>α,β</i>) and <i>AGDE</i><i><sub>T</sub></i> (<i>α,β</i>) are above recommended permissible limits while <i>ELCR</i><i><sub>T</sub></i> (<i>α,β</i>) is within the recommended permissible limit. The overall results obtained in this study indicate that the environmental samples have been radiologically impaired due to the crude oil spillage. An appropriate remediation technique was therefore recommended to remediate the polluted soil, sediment, and water to their near original state.展开更多
Drinking good quality water is essential for better health. It is therefore essential to assess the radiological quality of all water consumed in the District of Abidjan in order to prevent related hazards. Thus, the ...Drinking good quality water is essential for better health. It is therefore essential to assess the radiological quality of all water consumed in the District of Abidjan in order to prevent related hazards. Thus, the objective of this study was to assess the risk of cancer due to the ingestion of alpha and beta emitting radionuclides in the different types of water consumed in the region. A total of 63 water samples with 43 tap water samples, 5 bottled mineral water and 15 sachet water samples was collected and taken to GAEC laboratory for analysis. The low background Gas-less Automatic Alpha/Beta counting system (Canberra iMatic<sup>TM</sup>) was used to determine alpha and beta activity concentrations. Activity concentrations of both gross alpha and gross beta obtained in water sample were respectively lower than the WHO recommended limits of 0.1 Bq/l and 1 Bq/l. Also, the annual effective dose and total equivalent effective dose found in mineral bottled water samples were higher than in other types of water. The assessment of radiological lifetime risk has shown values of cancer risk due to ingestion alpha and beta emitters lower than recommended limit. These results indicate that there is no health hazard associated to consumption of water in the District of Abidjan.展开更多
Dear Editor,Parkinson’s disease(PD),is the most common neurodegenerative movement disorder with robustly identifiable electrophathophysiological hallmarks,namely increased beta and reduced narrow gamma oscillatory ac...Dear Editor,Parkinson’s disease(PD),is the most common neurodegenerative movement disorder with robustly identifiable electrophathophysiological hallmarks,namely increased beta and reduced narrow gamma oscillatory activity.1 In PD abnormal synchronization of the basal ganglia-thalamo-cortical circuits,which converge on the primary motor and the premotor cortex,is widely accepted to underlie debilitating motor symptoms.Deep brain stimulation(DBS)effectively improves motor symptoms in PD by decreasing cortical beta and increasing gamma activity,as well as modifying gamma-to-beta coupling.1 Yet,little is known about the link between pathological oscillatory activity and the underlying molecular signatures of the degenerating brain tissue in PD.展开更多
文摘The evaluation of gross alpha and beta activities in crude oil contaminated soil, sediment and water samples was conducted in ten oil polluted environment of Delta State using Gas-flow proportional counter. Samples were collected from the oil polluted environment in each oil field and samples were prepared and analyzed following standard procedures. The mean gross alpha and beta activities obtained are 331.4 ± 24.5 Bq kg<sup>-1</sup> and 11,335 ± 112 Bq kg<sup>-1</sup> respectively for soil, 259.2 ± 17.6 Bq kg<sup>-1</sup> and 4508 ± 96 Bq kg<sup>-1</sup> respectively for sediment, and 1.00 ± 0.09 Bq kg<sup>-1</sup> and 20.3 ± 1.7 Bq kg<sup>-1</sup> respectively for water. The estimated average values of the total annual effective dose equivalent (<i>AEDE</i><i><sub>T</sub></i> (<i>α,β</i>)), the total annual gonadal dose equivalent (<i>AGDE</i><i><sub>T</sub></i> (<i>α,β</i>))), and the total excess lifetime cancer risk (<i>ELCR</i><i><sub>T</sub></i> (<i>α,β</i>)) are 10.64 mSv y<sup>-1</sup>, 0.037 μSv y<sup>-1</sup> and 0.037 μSv y<sup>-1</sup> respectively. The gross alpha and beta activities values obtained in soil and sediment were relatively high compared to values reported in some parts of the country and other regions and countries of the world. The radiological risk parameters examined show that <i>AEDE</i><i><sub>T</sub></i> (<i>α,β</i>) and <i>AGDE</i><i><sub>T</sub></i> (<i>α,β</i>) are above recommended permissible limits while <i>ELCR</i><i><sub>T</sub></i> (<i>α,β</i>) is within the recommended permissible limit. The overall results obtained in this study indicate that the environmental samples have been radiologically impaired due to the crude oil spillage. An appropriate remediation technique was therefore recommended to remediate the polluted soil, sediment, and water to their near original state.
文摘Drinking good quality water is essential for better health. It is therefore essential to assess the radiological quality of all water consumed in the District of Abidjan in order to prevent related hazards. Thus, the objective of this study was to assess the risk of cancer due to the ingestion of alpha and beta emitting radionuclides in the different types of water consumed in the region. A total of 63 water samples with 43 tap water samples, 5 bottled mineral water and 15 sachet water samples was collected and taken to GAEC laboratory for analysis. The low background Gas-less Automatic Alpha/Beta counting system (Canberra iMatic<sup>TM</sup>) was used to determine alpha and beta activity concentrations. Activity concentrations of both gross alpha and gross beta obtained in water sample were respectively lower than the WHO recommended limits of 0.1 Bq/l and 1 Bq/l. Also, the annual effective dose and total equivalent effective dose found in mineral bottled water samples were higher than in other types of water. The assessment of radiological lifetime risk has shown values of cancer risk due to ingestion alpha and beta emitters lower than recommended limit. These results indicate that there is no health hazard associated to consumption of water in the District of Abidjan.
文摘Dear Editor,Parkinson’s disease(PD),is the most common neurodegenerative movement disorder with robustly identifiable electrophathophysiological hallmarks,namely increased beta and reduced narrow gamma oscillatory activity.1 In PD abnormal synchronization of the basal ganglia-thalamo-cortical circuits,which converge on the primary motor and the premotor cortex,is widely accepted to underlie debilitating motor symptoms.Deep brain stimulation(DBS)effectively improves motor symptoms in PD by decreasing cortical beta and increasing gamma activity,as well as modifying gamma-to-beta coupling.1 Yet,little is known about the link between pathological oscillatory activity and the underlying molecular signatures of the degenerating brain tissue in PD.
