Distribution of gamma-emitting natural radionuclides in soils and water around nuclear research establishments, Ile-Ife, Nigeria

Gamma radioactivity levels and their corresponding external exposure of soil samples from tantalite mining areas in Oke-Ogun, South-Western Nigeria

“…Sieved samples were weighed and a mass of 200 g of each sample was placed in a plastic container (6.5 cm in diameter and 7.0 cm in height). The plastic containers were hermetically sealed with adhesive tape (AERB, 2003) for 30 d, which is enough for secular equilibrium to take place (Olomo et al, 1994).…”

Natural activities of 40K, 238U and 232Th in elephant grass (Pennisetum purpureum) in Ibadan metropolis, Nigeria

“…A great deal of effort has been made in establishing baseline radioactivity levels in the different environments in the country. Some of the reported studies for the Nigerian environment (Ajayi et al, 1996;Babalola, 1984;Farai andJibiri, 2000a, 2000b;Jibiri and Farai, 1998;Jibiri, 2001;Olomo et al, 1994;Oresegun and Babalola, 1990;Sanni et al, 1985) were very fundamental and are expected to form a yardstick against which any future artificial release of radioactive elements and radiobiological assessment in the environment shall be based.…”

Radionuclide Concentrations in Some Fruit Juices Produced and Consumed in Lagos, Nigeria

“…This is coupled to a set of electronics made up of pre-amplifier, main amplifier, Analog-to-Digital Converter (ADC) and a Canberra Multichannel Analyzing (MCA) computer system. Accurate energy and efficiency calibrations of the gamma-spectrometry system were made using a standard source of radionuclides present in a sample since the accuracy of all quantitative results depends on the attainable accuracy of the system's calibration [14]. Energy calibration of the detector system is performed by measuring mixed standard sources of known radionuclides with well defined energies within the energy range of interest, usually 60-2000 keV [15].…”