Measurement of natural radioactivity in marble found in Pakistan using a NaI(Tl) gamma-ray spectrometer

Assessment of Radioactivity Contents and Associated Risks in Some Soil Used for Agriculture and Building Materials in Cameroon

“…It allows both qualitative identification and quantitative determination of the radionuclides in the sample. The counting time for both the sample and the background was 36,000 s. The photopeaks observed with regularity were identified to belong not only to the naturally occurring series decay radionuclide headed by 238 U and 232 Th, and non-series natural radionuclide 40 K, but also the presence of 137 Cs in most of the soils samples investigated. Other radionuclides if present, appeared rather infrequently at low levels or occurred at levels below the maximum detectable limits (MDL) statistically determined a two-standard deviation analytical error.…”

“…The characteristics of the selected gamma-emitting radionuclides used as monitor lines for this work are as shown in Table 1 Ac at 911.1 keV. 40 K and 137 Cs were determined directly from the 1460.3 and 661.6 keV gamma-emission respectively. The activities of the radionuclides in the measured samples were computed from the difference between the net peak and net background areas, accumulation time, absolute peak efficiency, absolute -ray emission probability and the sample mass.…”

“…This is favourable as a result of erosion which washes out soil to settle at the valley. 40 K is a naturally occurring radionuclide present abundantly in the earth crust as one of its major constituents. 40 K content in soil shows a more homogeneous distribution in the horizontal micro scale.…”

“…40 K is a naturally occurring radionuclide present abundantly in the earth crust as one of its major constituents. 40 K content in soil shows a more homogeneous distribution in the horizontal micro scale. The variability of 40 K among locations could be due to the differences in land management, for example, fertilization, plowing practices, geology and geography.…”

Radiological risk analysis of sediment from Kutubdia island, Bangladesh due to natural and anthropogenic radionuclides

“…The decay of these radionuclides in soil produces a β-γ radiation 0ield that crosses the soil-air interfaces and produces exposure to humans (2) . Again natural environmental radioactivity and the associated external exposure due to gamma radiation depend primarily on the geological and geographical positions, and appear at different levels in the soils of each region in the world (3)(4)(5)(6) . Due to these reasons our study was carried out in this island.…”