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luminescence characteristics of feldspar from Nigeria were investigated.
Without preheat treatment, the TL glow curve exhibited two peaks at 136°C and
175°C. When preheated to a temperature of 200°C only one peak was observed at
240°C. The highest net IRSL intensity was obtained for a stimulation
temperature of 250°C. The TL signal is reduced by IR stimulation, and the
longer the stimulation the more pronounced the effect. The dose response curves
for both the TL and the IRSL showed a linear relationship for the doses
considered in the study. Dose recovery test performed using the SAR method
showed consistency with given dose for both TL and IRSL.
Contamination of land could occur during the
extraction and handling of materials containing high levels of naturally
occurring radionuclide materials. These radionuclides find their ways into the
food chain. The activity concentrations of natural radionuclides 40K, 226Ra, and 232Th in heart, liver,
kidney, lungs, spleen and beef of cattle slaughtered and consumed in a tin
mining area of Jos Plateau, Nigeria were determined by gamma ray spectroscopy
method. The activity concentration of 40K is the highest in all the samples. The annual
effective dose to man through the ingestion of the radionuclides in the organs
was estimated. The mean annual effective doses calculated are 35.35 ± 13.84,
57.89 ± 38.27 and 46.93 ± 10.28 μSv?y?1 for heart, liver and
kidney, respectively. Those of lungs, spleen and meat are 28.44 ± 15.70, 48.34
± 28.85 and 41.24 ± 3.56
μSv?y?1, respectively. These are of the order of two magnitudes
higher than those obtained for food in Abeokuta, Nigeria.
Aim: To highlight the imaging features and the peculiarities associated with a giant ascending aortic aneurysm in a typical developing world setting. Presentation of Case: A 78-year-old known hypertensive and asthmatic woman of 25 and 10 years duration respectively. She had an untreated degenerative aortic valve lesion and moderate aortic regurgitation. This case study showed the complex interplay of background untreated aortic valve disease, aortic insufficiency, chronic hypertension, chronic airway obstructive disease and ageing in a case of giant aneurysm of the entire ascending aorta. It also emphasizes the role of imaging in diagnosis and follows up of ascending aortic aneurysm particularly where prevention is key to prevent the high mortality associated with Thoracic aneurysymal rupture. Conclusion: Timely institution of appropriate treatment of aortic valve disease, prevention and adequate control of hypertension is key to prevent the development and the grave prognosis of ascending aortic aneurysm, particularly in the developing world where appropriate medical facilities, expertise and treatment are scarce.