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Natural Radionuclides Content in Granites from Operational Quarry Sites

Detection 2019年第1期7卷 1-15页

作者： jamiu idowu lawal Department of Physics Skyline University Nigeria Kano Nigeria

Natural radionuclides content in granite from eight functional quarries in Osun State, Southwestern Nigeria was assessed. Eighty granite samples comprise?¾?inches.?½?inch and stone-dust were collected from Wolid, Slava, Ayofe, Espro, Ife/Modakeke, Krystal Vountein, Clario and Omidiran quarries in the State. Measurement was done using a high purity germanium (HPGe) detector. The statistical analysis was carried out using Statistical Package for Social Sciences (SPSS) software to determine if granite size has an impact on the activity concentrations. The results revealed that the mean activity concentrations of 238U (12.64 ± 1.89 Bq·kg -1) and 232Th (16.93 ± 2.46 Bq·kg -1) were highest in?¾?inch granite and lowest in stone-dust (5.01 ± 0.77 and 8.97 ± 1.37 Bq·kg -1 respectively), whereas 40K is highest in the ¾?inches (266.19 ± 35.53 Bq·kg -1) and lowest in?½?inches (151.85 ± 25.09 Bq·kg -1) granite. Espro has the highest (23.75 ± 3.74 Bq·kg -1) while Wolid has the lowest (4.11 ± 0.73 Bq·kg -1) 238U activity concentration and Slava has lowest for 232Th (8.21 ± 1.12 Bq·kg -1) and 40K (109.54 ± 11.06 Bq·kg -1). The radiological hazard parameters such as absorbed dose, annual effective dose radium equivalent, gamma index, external index, and internal index, were calculated to assess the radiation hazards associated with granite samples. The results obtained are lower than the recommended limits. The results were compared with the published data of other countries. Although, all the calculated radiation hazard indices were lower than the permissible limits. Therefore, people working in the quarries, granite end-users and the general public are safe from radiological health risks from the quarries, since there is no significant health hazard. The research will give reliable information on activity concentrations of natural radionuclides in granite rocks, contribute to a better understanding of radioactivity distribution in granite, and develop

关键词： Activity Concentration Radionuclides Granite Quarries Radiological Parameters

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Prevalence of Cryptosporidial Oocysts in Soil of Recreational Parks in Abuja, Nigeria

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Open Journal of Medical Microbiology 2014年第4期4卷 224-227页

作者： idowu Oluwabukola Olufemi Otalu Otalu Jr. Mohammed Bello Idris Alao lawal Jacob Kwada Pajhi Kwaga Department of Veterinary Public Health and Preventive Medicine Faculty of Veterinary Medicine Ahmadu Bello University Zaria Nigeria Department of Veterinary Parasitology and Entomology Faculty of Veterinary Medicine Ahmadu Bello University Zaria Nigeria

Contamination of soil with cryptosporidial oocysts poses a great health risk to people especially in individuals who are immune-compromised. Exposure to contaminated soil can cause diarrhoea in humans especially in children who play around the parks and may not wash their hands before handling food. The prevalence of cryptosporidial oocyst in soils of 4 recreational parks in Abuja, Nigeria was investigated. Four hundred soil samples were collected from various locations within the recreational parks and examined for the presence of cryptosporidial oocyst using modified acid fast staining technique. In nine (2.3%) of the samples, 8 were from park A and 1 was from park B contained cryptosporidial oocyst. There was significant association (χ2 = 20.1;df = 2;p = 0.00004) between prevalence of Cryptosporidium oocysts and level of hygiene of the parks. It was concluded that soil in recreational parks may be a source of infection with Cryptosporidium oocysts.

关键词： Cryptosporidial Oocyst Recreational Parks Abuja Health Risk

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