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handle: 10261/60649
[ES] Se presentan los datos relativos al poder generador del radón 222 de diferentes suelos de pradera gallegos -formados sobre roca madre granito y gneis y 160 cm. de pluviosidad media y se comparan sus actividades con otros grandes grupos mundiales. Los curies de radón 222 que se escapan de 2.500 gramos de suelo, en equilibrio con su ascendiente el radio, en alguno de los suelos locales, es mayor que en los demás grandes grupos que se comparan, alcanzando un máximo de 25 x 10-10 curies por litro de actividad en su atmósfera o 96 x 10-14 curies por gramo de suelo seco. La parte media y baja de los perfiles mostraron, en general, mayor poder generador, pero la relación encontrada entre éste y el contenido de la fracción arcilla fue muy pobre, aunque la actividad máxima corresponde al suelo de contenido más alto -11 por 100- en arcilla. Se dan también los valores de radón liberados por el suelo en agua hirviendo y en suspensión amoniacal. El radio cambiado con amonio, dado por el poder generador en radón, es superior al de la suspensión acuosa y que el encontrado en el material original del suelo. La acumulación de plomo en suelos y su absorción por plantas naturales -Ulex nanus, Pteris aquilina y Carinephorus ca nescens-, dominantes en las zonas de recogidas de muestras, parecen guardar poca relación con la generación de radón, aun cuando el suelo de más alto radón generado es el de mayor concentración en Pb en suelos y plantas.
[EN] Data are presented relative to the radon222 generating power of different Galician prairie soils-developed upon granite and gneiss parent material, being the mean rain-fall about 160 cm., and comparisons with a variety of several World Great Soils Groups are made. The curies of Rn222 escaping from 2.500 grams of soils material, at equilibrium with its parent radium, in some of Galician soils is much greater than in the other world great groups compared, reaching a maximum of 25 x 10- 10 curies per liter of soil atmosphere activity or 96 x 10-14 curies per gram of dry soil Middle and lower part of the soil profile showed, in general, higher generating power but a poor correlation was found between this and the clay fraction of the soil, although the maximum activity corresponds to the soil of the higher -11%- clay content. Values of radon released by the soil in boiling water and ammonium suspensions are also given. The radon generating power of the ammonium solution is greater than the water suspensions and than the one of the original soil material. The accumulation of Pb in soils and its absorption by natural plants -Ulex nanus, Pteris aquilina and Carinephorus canescens- seems to be of poor correlation with the radon generation, even though the soil of higher radon generated is the one of major Pb concentration in soils and plants.
Peer reviewed
Lead, Plomo, Soils, Radón 222, Galicia, Suelos
Lead, Plomo, Soils, Radón 222, Galicia, Suelos
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