Transferencia de radionucleidos naturales del suelo a plantas en Savar Dhaka

M. Haque, J. Ferdous


Es necesario analizar la radioactividad de muestras medioambientales procedentes de emplazamientos de reactores nucleares antes de que el público en general tenga libre acceso a las plantas que crecen en sus suelos. Se muestrearon plantas y sus correspondientes suelos en los alrededores del reactor Savar, cerca de Dhaka (Bangladesh), y se midieron las concentraciones de actividad de los radionucleidos naturales 226Ra (de la cadena del 238U), 228Ra (de la cadena del 232Th) y 40K utilizando espectrometría de rayos gamma. Los suelos de Savar contenían más 40K radioactivo que 226Ra y 228Ra. Se investigó la influencia de algunas propiedades del suelo sobre las concentraciones de actividad y los factores de transferencia (TF) de estos radionucleidos naturales. Las concentraciones de actividad de 40K en plantas fueron mucho más elevadas que las de 226Ra y 228Ra debido a su mayor absorción por las plantas a partir del suelo. Los factores de transferencia para 226Ra, 228Ra y 40K variaron entre 0,04 y 0,10, entre 0.12 y 0.32, y entre 0.24 y 0.72, respectivamente. Se encontró que los factores de transferencia de suelo a planta para el 40K eran mucho más elevados en plantas, lo que puede ser atribuido a que este elemento es esencial para las plantas. Este estudio mostró que las concentraciones de actividad de estos radionucleidos en plantas y sus factores de transferencia a las mismas parecían depender de sus concentraciones de actividad en el suelo.

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