[en] In this memory we describe the design, testing and calibration of different spectrometers to measure transition probabilities from the vacuum ultraviolet to the infrared spectral region. For the infrared measurements we have designed and performed a phase sensitive detection system, using an InGaAs photodiode like detector. With this system we have determined the transition probabilities of infrared lines of KrI and XeI. For these lines we haven't found previous measurements. In the vacuum ultraviolet spectral region we have designed a 3 m normal incidence monochromator where we have installed an optical multichannel analyzer. We have tested its accurate working, obtaining the absorption spectrum of KrI. In the visible region we have obtained the emission spectrum of Al using different spectral: hallow-cathode lamp and Nd: YAG laser produced Al plasma. With these spectra we have determined different atomic parameters like transition probabilities and electron temperatures.(author). 83 refs

[en] When dealing with more than two classes, classification problems become more complex, and hence the variable importance analysis. In this article, we present a comparative study of variable importance analysis in the multiclass case. The applied methodology uses the Conditional Inference Tree algorithm (CIT) (as it perfoms well in pronounced imbalanced data sets) along with the permutation importance technique. The comparison consists of evaluating the methodology using different performance measures: The Volume Under the Surface (VUS) and its computation alternatives, the G-Mean measure and the generalization of the Are Under the Curve (AUC). Several simulated scenarios characterized by their linearity and multiclass imbalance levels are built and tested.

[en] In this paper, a set of simultaneous measurements of Rn, DRn and ThB concentrations in the atmospheric air 2m above the ground have been carried out over a 6 month period. This research has allowed us to demonstrate that the evolutions of Rn, DRn and ThB are very similar. The parallels in the behaviour of the three tracers has been shown because they have evolved analogously in relation to the influence of the air mass and in their correlations with meteorological variables. On the other hand, the location of Malaga on the coast, with its characteristic orography, permitted us to analyze some special situations which had not previously been analyzed. (author)

[en] Measurements of gross-α and gross-β activities were made every week during the years 1992-1997 for airborne particulate samples collected using air filters at a clear site. The data are sufficiently numerous to allow the examination of variations in time and by these measurements to establish several features that should be important in understanding any trends of atmospheric radioactivity. Two models were used to predict the gross-α and gross-β activities. A good agreement between the results of these models and the measurements was highlighted

[en] The Rn gas exchange velocity through the interface sea atmosphere has been estimated. Our measurements have been made in a sampler station located in Malaga bay, obtaining a mean value of 0.45 m/d. The corresponding magnitude of the thickness of boundary layer is 316μ. Experimental results are discussed. No clear relationship can be found between the gas exchange rate and wind speed. (author)

[en] The flux of ²²²Rn from shallow water off the bay of Malaga has been measured by the accumulation method. The mean value of 67 atoms m^-2 s^-1 was obtained compared with a range of values from 11 to 116 atoms m^-2 s^-1 calculated from near-surface ²²²Rn profiles in seawater obtained by other investigators. Quanititative relations between the flux of ²²²Rn and ²²²Rn concentrations in surface water and the temperature of seawater were found. A correlation was also found between the flux of ²²²Rn and the wind speed at the moment of taking the sample

[en] The atmospheric air Rn concentrations have been measured in two sampling points in Spain. These points show very different geographic and climatological characteristics. Hourly measurements were taken over a period of nearly one year. The study has been carried out on the results of both sampling points and contains the following aspects: (a) influence of the origin of air masses; (b) statistical analyses and Fourier series; (c) relationship between atmospheric air Rn concentrations and meteorological parameters; (d) relationship between atmospheric air Rn concentrations and Pasquill and Turner's stability indexes. These studies show atmospheric Rn dependency on the vertical stability of the lower atmosphere. The obtained results imply a more effective use of Rn as a tracer in areas with a continental climate rather than a coastal one. (Author)

[en] The flux of ²²²Rn and O₂ from shallow water off the Bay of Malaga has been measured. The mean value of flux of ²²²Rn is evaluated to be 74 atoms/m² · s. The Bay is a weak source of oxygen to the atmosphere, where the net production of oxygen is found to be 1.82 mol/m² · y. Moreover, the gas exchange rates of ²²²Rn and O₂ across the air-sea interface has been determined by the radon method. The gas exchange rates and the wind speed have been estimated. (author)

[en] Spain is a country rich in mineral springs. A nationwide study on the natural radioactivity has been made to determine the gross-α and gross-β activities in bottled water. These measurements are important for extracting radiological information of the activity present in a sample. Of all samples collected, only 26.2% have an α-activity higher than 100 mBq/1, and none of them have a β activity higher than 1000 mBq/1. An explanation for the different α and β activities in bottled water that relates to the geological composition of the source is suggested. (Author)

[en] Measurements of ²²²Rn soil concentrations were made by inserting stainless-steel sampling tubes into the soil. The samples of the soil interstitial air were taken in to pre-evacuated 1 L glass flasks. The glass flasks are cylindrical and coated with a film of ZnS(Ag). ²²²Rn was measured by counting the alpha particles emitted by ²²²Rn and its daughter products, ²¹⁸Po and ²¹⁴Bi, when they reached radioactive equilibrium. Measurements of ²²²Rn gas concentrations in the soil air interstices by the method at different depths were used to calculate the diffusion coefficient of the ²²²Rn in the soil air. This study has been carried out for diverse soils. (Author)