Investigation of the soil–plant transfer of primordial radionuclides in tomatoes by low-level γ-ray spectrometry

Soil to plant transfer of 238U, 226Ra and 232Th on a uranium mining-impacted soil from southeastern China

“…Martı´nez-Aguirre et al (1995) reported that Th exhibited a much lower mobility than U, which is consistent with our observations that 232 Th has smaller TF values. The magnitude and range of TFs of 238 U, 226 Ra and 232 Th found in this study appeared to be generally similar to values obtained in other studies where root uptake was the primary mechanism of accumulation (IAEA, 1994;IUR, 1994;Bettencourt et al, 1988;Frissel and Koster, 1988;Ko¨hler et al, 2000).…”

“…Up till now, several investigations on mobilization of natural radionuclides (such as 238 U and 226 Ra) in different compartments (soil, plant, and water), as well as the transfer between them, have been performed at different uranium mining sites around the world (Petterson et al, 1993;Krizman et al, 1995;Fernandes et al, 1996). However, there is no information about the transport of 238 U, 226 Ra and…”

Geoquímica de radionuclídeos naturais em solos de áreas circunvizinhas a uma Unidade de Mineração e Atividade de Urânio

“…Os pequenos percentuais de 210 Pb na F1 (fração biodisponível) têm sido observados em alguns trabalhos e estão relacionados com a baixa mobilidade e biodisponibiliddae desse radionuclídeo (Köhler et al, 2000;Ewers et al, 2003). Os resultados de baixa biodisponibilidade obtidos para 210 Pb em Caetité estão de acordo com os obtidos por Vasconcellos et al (1987) (Langmuir, 1997).…”

“…A textura mais argilosa verificada no Latossolo Amarelo distrófico, no ponto 8, e no Argissolo Vermelho-Amarelo, no ponto 13, deve ter influenciado nessas maiores atividades. A alta afinidade do 210 Pb com os óxidos de Fe tem sido observada em vários trabalhos (Köhler et al, 2000;Ewers et al, 2003).…”

The influence of historical forestry practices and climate on the sediment retention function of wetlands.

“…Approximately 1-3 g of sediment from each 1 cm core section was packed into a 4 mL plastic vial and left for three weeks to allow equilibrium to be reached between 214 Pb and its parent radioisotope 226 Ra (Kohler et al, 2000). Measurements of total 210 Pb, supported 210 Pb and 137 Cs activities were undertaken at the Plymouth University Consolidated Ra dioisotope Facility, England, UK using a EG&G Ortec well (GWL-170-16-S N-type) HPGe…”