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Skip to main content. Log In Sign Up. Radon concentrations in air, soil and water in a granitic vida de loco mente en blanco instrumental s Gutierrez Vill Radon concentrations in air, soil, and water in a granitic area: Luis M. Ma Elena Charro Huerga Fdo.: Gracias a vosotros, Alejandro y Pepe, por haberme concedido el inmenso honor trophy hunter 2007 torrent tpb pirate haberos cono- cido.
Gracias a Susana y espero que la sobrinita pronto ingrese en este mundo. Eduardo, pibe, loco, mi gratitud hacia ti es muy grande. A Pepe Nalda, que sin ti nada de este trabajo hubiera sido posible. Como no, gracias por tu amistad Silvia. A Susana B. Finalmente, merecen un lugar destacado en este apartado los viejos ami- gos Nacho, Pablo y Vito.
Special thanks are due to Lorraine, Fran and little monsters. Thanks so much for make my stay in Dublin so happy. You are always in my heart. My gratitude to Tony. Thanks for your help allowing me to carry out the stay at the RPII. Thanks for your disposal to help me when I have needed it.
Dear O. Heinz Surbeck, my stay in the country of the Alps was wonderful thanked to you. Thanks a million for it. Rose and Peter, my Irish host family, you are simply great. Thanks to A. Kies and Catherine for the good moments. Gracias a todos vosotros. Liquid Scintillation Counting. Alpha spectrometry. Proportional counter. Bottom Up and Top Down approaches. Radon measurements indoors. Despite the fact we are obliged to use units according to SI, in some parts of the work this is not the case.
In the case of pressure, we use in some cases atm instead of Pa. Thesis is focused on the development of a measurement system for radon detection and the determinations of natural radioactive radionu- clides in air, soils and drinking water. All of the measurements in this Ph. This thesis deals with radon measurements, a gaseous radioactive element belonging to uranium decay chain.
This gas is more common in places where its geology is composed by radium and uranium minerals, although this ele- ment can be found very far away from its origin due to its good solubility in water. Due to radon being a gas, it can be found everywhere: All the samples analysed in this work black ops 2 aimbot pc radon indoors measurements made have been carried out in a Spanish granitic area.
This is one of the most in- teresting Spanish zones with the greatest levels of natural radioactivity see MARNA map in Figure 1 vida de loco mente en blanco instrumental s the area covered in this work is highlighted in red.
An instrumental development of a radon exhalation measurement has been done too. When we are talking about radon in soil, one of the most important pa- rameter to be studied is vida de loco mente en blanco instrumental s exhalation and the emanation factor.
The measurement system developed in this work is based on the use of Silicon PIN photodiodes as radon detectors, due to the fact that radon is an alpha emitter. MARNA map: Silicon PIN photodiodes are suitable for the measurement of radon exha- lation from soil samples and building materials.
The designed exhalation measurement system works with samples in the laboratory where conditions such as temperature and pressure are under control. The measurement of radon and its daughters in air is very important, es- pecially from the point of view of radiological protection in order to prevent population from the hazard of radon gas. Nowadays two of them are of interest which are active methods and passive methods.
Active methods are interesting if a precise second by second or minute by minute study is re- quired. In cases where it is necessary to develop a screening study passive vida de loco mente en blanco instrumental s like the use of track detectors and activated charcoal canisters can be used. Indoor radon measurements have been carried out in this work using passive and active methods. This spectrometer is a Quantulus Model. When etching track detectors were used, part of the work was made under collaboration with radon Group of Universidad de Cantabria Spain and a special training on the use of these detectors was carried out at the Radiological Protection Institute of Logo facebook toolbar RPII, Dublin, Ireland.
Radon concentration in water is of a high importance too, specially be- cause this is one of the main sources of radon in a house, especially water drawn from underground sources. The use of liquid scintillation counting LSC is particularly inter- esting when it is necessary to measure high volumes of samples in a short period of time. For the determination of radium in drinking water, alpha spectrometry is usually used. This technique uses a metal disc for the ad- sorption of radium and uranium.
Heinz Surbeck. The use of LSC for the determination of radon and radium in water has been also used widely. All the techniques mentioned have been applied to the measurements of radioactivity in air, soil and water samples in locations in the neighbourhood of an off the record messaging sparkletts uranium mine site in Saelices el Chico located in one of the Spanish zones with the greatest radioactivity levels.
Finally, the main purposes of this work can be summarized as follows: This nuclear emission is due to the bounding energy of alpha particles. The next expression shows an schematic view of this radioactive decay: Mean life of gamma decay uses to be short: Isomers are written with an m close to mass number of the nucleus, e. It is a process where electrons are emitted from a nucleus instead of photons. They are mono—energetic electrons and this process is followed by the emission of an X—ray.
Sources of this type of process are used as standards in energetic calibrations of particle detectors. Table 1: Internal conversion sources. Source Energy keV Sn Ba First of all, we need to know how dangerous radiation can be. This magni- tude is similar to the velocity and the activity of a radioactive substance indicates how fast the substance disintegrates with time.
One Curie, was the activity of one gram of radium Ra. This new unit was called Becquerel Bq and it implies the unit counts per second. We can try to give an overview only from a qualitative point of view of the magnitude of these units and the danger they imply: First of all, the energy absorbed per mass unit is called absorbed dose D. The SI unit for absorbed dose is called gray Gy. The SI unit for equivalent dose is called sievert Sv and the equivalence between sievert and an old unit called rem is the next: The SI unit for this magnitude is called sievert Sv.
There are four natural radioactive chains containing the majority of natural radioactive isotopes. Figure 2 shows the natural radioactive chain of U: Figure 2: Natural radioactive serie of U showing the decay modes and life times. If we know the activity or number of elements of a particular member of a family, it is possible to know the same parameter of other members using the Bateman equations.
For a radioactive chain with n isotopes, the variation of the number of nucleus of the isotope i with time can be written as follows: The values considered in the denomi- nator of equation 2. Taking into account equations 2. The time tmax we obtained is the necessary time for the ideal equilibrium between parent and daughter: Vida de loco mente en blanco instrumental s equation 2.
Secular equilibrium If the decay constant, or the probability of decay of the daughter is much bigger than the vida de loco mente en blanco instrumental s constant of the parent, equation 2. So an equilibrium situation is reached where daughter nuclei decays at the same velocity as parent. Transient equilibrium. No equilibrium. In particular, an interesting discovery was made while working with phosphorescent materials by the French scientist Henri Becquerel.
Becquerel thought that the glow produced inside a cathode ray tube by x— rays was caused by phosphorescent materials. Fortunately, Henri Becquerel was studying phosphorescence using materials composed by uranium.
He put a uranium salt over a photographic plate.