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It have been performed a study of the physical-radiological characteristics of sediments of the Havana Bay. The low background spectrometric measurements allowed to quantify the concentrations of the isotopes radioactive gamma emitters 210Pb, 137Cs, 238U, 226Ra, 232Th y 40K. The obtained results will be very useful to the studies on bay contamination, its conditions of sedimentation. [ABSTRACT FROM AUTHOR]

A new method to study some features of landslides on slopes is been used. The method is based on the measurement of the radioactive isotope caesium 137 at different points of the soil affected by the landslide. Three different landslides, which have recently happened in the north of Spain, have been studied through this method, by taking samples from the soil at 15 point altogether. The samples are cut every 5 cm depth and measured by gamma spectrometry to determine the caesium 137 in the points under study. The results obtained show important differences in the profiles and in the caesium inventories related to the position of the points along the soil. These differences have been used to describe some features of the landslides, namely age, zone of influence or evolution. [ABSTRACT FROM AUTHOR]

A study of the radioactivity existing in a high number of springs located in Cantabria, Northern Spain, was made. The springs analyzed are not seasonal and are distributed around the region. Water samples for each spring were analyzed in three sampling campaigns, and alpha and beta total activities and 226Ra and 222Rn concentrations were determined for each sample. The measuring techniques employed were gamma spectrometry with Ge detector, counting with gas flow proportional counter, and counting with ZnS(Ag) scintillating detector. Results show that springs with high radon water concentration have high values respect to the national mean. The springs with the highest radium and radon levels have thermal waters and are located on two deep fault, those have historic seismicity and seismical and geomorphological evidences of recent tectonic activity. [ABSTRACT FROM AUTHOR]