Cuestionario de distribuciones en el muestreo

Parcialmente financiado por el PIE13-02

Cuestionario de estimación por intervalos

Parcialmente financiado por el PIE13-02

Cuestionario de estimación puntual

Parcialmente financiado por el PIE13-02

Estimación por intervalos

Presentación de estimación por intervalos y cálculo del tamaño muestral en poblaciones infinitasParcialmente financiado por el PIE13-02

Temporal analysis of natural radionuclides deposition at Málaga(2005-2016)

Atmospheric deposition of radionuclides has been investigated in many studies from the aspects of both radiation protection and geochemistry. The present study, carried out in the city of Málaga, in the southeast of Spain, focuses on the assessment of the bulk depositional fluxes of three natural radionuclides: 7Be (cosmogenic origin), and 210Pb and 40K (crustal origin). These three radionuclides are useful markers of particles arising from their respective sources. To obtain fundamental information of atmospheric transportation, sedimentation and geological process of particulate matter, a long-term monitoring of atmospheric deposition has been carried out in Málaga from January 2005-December 2016. Samples of bulk deposition were collected on a monthly basis on a stainless steel tray from January 2005 to December 2016. Afterwards, a volume of 6 L of the bulk deposition was reduced via evaporation to 1 L approximately and transferred to a Marinelli geometry container for gamma counting. Additionally, aerosols samples were collected weekly in cellulose membrane filters of 0.8μm pore size and 47mm diameter with an air sampler lodged in an all-weather sampling station, situated on the roof near the bulk rain collector. Gamma counting of the aerosols and bulk deposition samples was performed using an intrinsic germanium coaxial detector, Re-Ge-type (CANBERRA). This study describes the results and then discusses characteristics of atmospheric deposition of mentioned radionuclides with respect to seasonal variations and dependency on controlling factors. The depositional fluxes of all radionuclides showed a clear seasonal trend with summer minimum and high values in wintertime

Natural radiactivity from building materials in Spain

The industrial construction sector is very important in Spain. Building materials used in this industry are sources of radiation from natural radionuclides they contain. The European Commission published some recommendations to facilitate the trade of these materials in the E.U. The studies about this subject have increased notably during last years. This, probably, can be associated with the increase interest from natural radiation radiological risk on indoor exposure.Universidad de Málaga. Campus de Excelencia Internacional Andalucía Tech. Consejo de Seguridad Nuclear. CSN-201

Radionuclides in arctic marine macroalgae from Kongsfjorden (Svalbard)

Seaweeds are known to be useful environmental bioindicators since they bioaccumulate radioisotopes at very low environmental concentrations. Levels of natural radionuclides in six ecologically relevant brown and red seaweed species from Arctic coasts (Kongsfjorden, Spitsbergen, Svalbard Islands) were analysed in the present study, in order to characterise the levels of natural radioactivity in this ecosystem and to compare this with previously published data in coastal areas from other latitudes. Thalli were collected by SCUBA divers at different depths in Hansneset in September 2014 and transported immediately to the laboratory. Young thalli, free from macroscopic epibiota, were dried, powdered and confined in a standard geometry before gamma spectrometry measurements. Then, the radioactivity of 7Be, 40K, 208Tl, 210Pb, 212Pb, 226Ra and 228Ra was measured by high-resolution gamma spectrometry using high-purity germanium detectors for 172800 s. Detectors were calibrated using a traceable multi gamma standard source and results are on a dry weight and fresh weight basis and are decay corrected to the date of sampling. Our results revealed the influence of cosmogenic radionuclides in the intertidal zone, as shown by the unique presence of 7Be in the brown macroalga Fucus distichus, the only analysed species inhabiting the intertidal. High concentrations of 40K were observed in all species, as this is one of the essential elements in biota. Remarkably is the high content of 210Pb in the red seaweeds Phycodrys rubens and Ptilota gunneri, suggesting that these species might possess a higher capacity for heavy metals bioaccumulation than the analysed brown seaweeds

Insecticide activity of bifenthrin nanoparticles synthesized by laser ablation of solids in liquids

ARTICULO DE INVESTIGACIONARTICULO DE INVESTIGACIO

Diagnóstico y medidas de remediación por altas concentraciones de radón en vivienda unifamiliar en el sur de España

Desde hace años existe una importante preocupación e interés en la comunidad científica por la exposición a altos niveles de radon en el interior de la viviendas, centros de trabajo y colegios. Esta preocupación se está extendiendo al conjunto de la población y son numerosas las referencias en artículos de prensa y medios de comunicación a este gas noble. Es bien sabido que las personas que inhalan altas concentraciones de radón tienen un riesgo mayor de padecer cáncer de pulmón, que es inducido por los descendientes del gas inhalado. En este trabajo presentamos los datos más relevantes obtenidos en una vivienda unifamiliar en la que los propietarios sospechaban de estar sometidos a altas concentraciones de radon. Para realizar el estudio utilizamos sistemas activos, concretamente 6 dispositivos con cámara de difusión con diodo de silicio, modelo Alpha E de Saphimo y un equipo AlphaGuard 2000 Pro, y sistemas pasivos mediante cartuchos de carbón activo para medidas en equipo de espectrometría gamma. Se trata de una vivienda de 550 m2 distribuidos en dos módulos con dos alturas y sótano acondicionado como vivienda del servicio. Tras una evaluación inicial en toda la vivienda, detectamos altos niveles de radon en tres estancias de la casa, registrando valores medios >6000 Bqm-3 con un valor máximo de 25350 Bqm-3. Se realizaron medidas correctoras mediante el uso de materiales impermeabilizantes y sistemas de extracción forzada en la zona no habitada del sótano consiguiendo disminuir los niveles de radon por debajo de los 100 Bqm-3 como valor medio

Distribuciones en el muestreo. Introducción a la inferencia estadística.

Presentación de los conceptos introductorios a la inferencia estadísticaParcialmente financiado por el PIE13-02