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Radon Risks Assessment with the Covid-19 Lockdown Effects

Journal of Applied Mathematics and Physics 2020年第7期8卷 1402-1412页

作者： josue maya Lawan Loubou Mohamadou Serge Mbida Mbembe André Atangana Likéné Bertrand Akamba Mbembe Maimounatou Boubakari National Radiation Protection Agency Yaoundé Cameroon Department of Physics Faculty of Science University of Ngaoundere Ngaoundere Cameroon Faculty of Health Sciences University of Buea Buea Cameroon Laboratory of Nuclear Physics Department of Physics Faculty of Science University of Yaounde I Yaounde Cameroon Centre for Atomic Molecular Physics and Quantum Optics University of Douala Douala Cameroon

This work draws attention to the effects of the second cause of lung cancer which is also the largest source of exposure to ionizing radiation, radon, during the lockdown recommended by the World Health Organization (WHO) due to the Covid-19 pandemic. The basic assumption is that the exposure times have been assimilated to the 03-month lockdown time and the 02-week maximum incubation period of the disease. Doses during these periods and Relative Risk of Lung Cancer (RRLC), Lung Cancer Cases per year per million people (LCC) and Excess Lifetime Risk of Cancer (ELRC), were evaluated based on the concentrations obtained in high natural background radiation area in Cameroon. The existing exposure situation due to radon is then reevaluated and ranged from 0.76% to 17.55%. These results show that the reconsidered exposure time would be equivalent to the exposure time of a worker over one year, with their respective doses values becoming equivalent. The risks of developing lung cancer were also evaluated and it has been found that due to this pandemic it unfortunately increased.

关键词： Radon Lockdown Lung Cancer Doses Risks

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Accuracy and Precision of Energy Dispersive X-Ray Fluorescence (EDXRF) Analysis of Trace and Major Elements in Rock Standard Reference Materials Using Fine Powder

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Journal of Geoscience and Environment Protection 2023年第6期11卷 83-95页

作者： Jean Faustin Sabouang Jean Félix Beyala Ateba Cebastien Joel Guembou Shouop josue maya Cedric Tayou Kamkumo Lawan Loubou Mohamadou Augustin Simo National Radiation Protection Agency Yaounde Cameroon

In this work the performance of a screening analytical method for Energy Dispersive X-Ray Fluorescence (EDXRF) analysis in terms of accuracy and precision was evaluated through analysis of rock standard reference materials. The method allowed the division of elements into four groups taking into account the excitation energies and measurement conditions of the sample. Two standard reference materials were used and 15 sample replicates were prepared and analyzed, then statistics were applied to assess the precision and accuracy of analytical results. The obtained results show that major compounds or elements (SiO2, P2O5, K2O, CaO, Fe2O3, Ti) can be determined in fine powder sample with a deviation lower than 15%, and a relative standard deviation in the range (1 - 10)%. The deviation was found to be lower than 5% for major compounds such as K2O, and CaO, which suggest that the EDXRF is accurate in evaluating major elemental concentrations in rock samples. It was also found that the method seems to be more accurate and precise for major elements than for trace element investigation. This screening analytical method can be used for routine analysis with acceptable results, even though the method should be optimized to increase its precision and accuracy.

关键词： ED-XRF Screening Method Rock Material Accuracy Precision

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