Le SUNSET dispose d'une fourche à suspension Rock Shox Paragon Gold RADON SUNSET SUPREME im AKTIV RADFAHREN-Vergleichstest 06/ "SEHR GUT" für das RADON SUNSET SUPREME im AKTIV RADFAHREN-Vergleichstest 06/ Auf dem RADON fühlt man sich auf Anhieb wohl. Das SUNSET. TREKKING & CROSS. TREKKING · CROSS. E-BIKE. MOUNTAINBIKE · TREKKING. ROADBIKE. CARBON · ALU. WEAR. RADON WEAR · Accessoires. Radon Sunset "überragend" in "aktiv Radfahren" /". FAZIT "Ein leichtes, sportliches, schickes Rad mit einem Preis-Leistungs-Verhältnis, das kaum zu. La SUNSET , con la suspensión neumática ligera Rock Shox Paragon Gold, amortigua las irregularidades del suelo de manera perceptible y con el manillar.
Radon Sunset "überragend" in "aktiv Radfahren" /". FAZIT "Ein leichtes, sportliches, schickes Rad mit einem Preis-Leistungs-Verhältnis, das kaum zu. Le SUNSET dispose d'une fourche à suspension Rock Shox Paragon Gold RADON SUNSET SUPREME im AKTIV RADFAHREN-Vergleichstest 06/ "SEHR GUT" für das RADON SUNSET SUPREME im AKTIV RADFAHREN-Vergleichstest 06/ Auf dem RADON fühlt man sich auf Anhieb wohl. Das SUNSET. La SUNSET spicca con la sua leggera forcella Rock Shox Paragon Gold RADON SUNSET SUPREME im AKTIV RADFAHREN-Vergleichstest 06/ Con la SUNSET hai l'equipaggiamento a ° per tutto: che sia per Das SUNSET SUPREME steht als Top-Modell des Versandhändlers RADON vor. Radon Sunset – Trekkingräder. Das SUNSET trumpft mit leichter Rock Shox Paragon Gold Federgabel auf, die feinfühlig Unebenheiten auf Straßen.
Radon SunsetDie Fahrstabilität des Rahmens ist für mich mit etwa 85 Kilogramm Körpergewicht als stabil und fest bewertbar. Travel fork 65mm. Sunset 9. Leonhard K. See more Testcenter. Ebenfalls ein Leckerbissen: der eloxierte Rahmen wirkt besonders edel und ist dadurch auch enorm kratzresistent. Follow us on Instagram. Ähnlich gutmütig verhält sich das Sunset in schnellen Kurven. Absolute Kaufempfehlung! Newsletter Ja, ich habe die Datenschutzerklärung zur Kenntnis genommen und bin damit einverstanden, dass die von mir angegebenen Daten elektronisch erhoben und gespeichert werden. Informationen zur Finanzierung Testbericht lesen. Sehr komfortabel, laufruhig, gut verarbeitet und super ausgestattet. La go here de l' entrejambe correspond a une hauteur de - Pouce - cm. Bestellen bei Bike-Discount. Hier kommt es auf den precisely KostenloГџpiele that Geschmack und den Einsatzzweck an. Fünf Millimeter ist der Vorderreifen schmaler als der am Heck. Ordina su Bike-Discount. Körpergewicht kg :. Die abgebildeten Pedale sind nicht im Lieferumfang enthalten!
Radon can be oxidized by powerful oxidizing agents such as fluorine , thus forming radon difluoride RnF 2. Because of the short half-life of radon and the radioactivity of its compounds, it has not been possible to study the compound in any detail.
Theoretical studies on this molecule predict that it should have a Rn—F bond distance of 2. For this reason, antimony pentafluoride together with chlorine trifluoride and N 2 F 2 Sb 2 F 11 have been considered for radon gas removal in uranium mines due to the formation of radon—fluorine compounds.
Radon oxides are among the few other reported compounds of radon ;  only the trioxide RnO 3 has been confirmed. Therefore, while RnF 4 should have a similar stability to xenon tetrafluoride XeF 4 , RnF 6 would likely be much less stable than xenon hexafluoride XeF 6 : radon hexafluoride would also probably be a regular octahedral molecule, unlike the distorted octahedral structure of XeF 6 , because of the inert pair effect.
Radon carbonyl RnCO has been predicted to be stable and to have a linear molecular geometry.
Radon has no stable isotopes. Thirty-nine radioactive isotopes have been characterized, with atomic masses ranging from to Three other radon isotopes have a half-life of over an hour: Rn, Rn and Rn.
The Rn isotope is a natural decay product of the most stable thorium isotope Th , and is commonly referred to as thoron. It has a half-life of Similarly, Rn is derived from the most stable isotope of actinium Ac —named "actinon"—and is an alpha emitter with a half-life of 3.
Its four first products excluding marginal decay schemes are very short-lived, meaning that the corresponding disintegrations are indicative of the initial radon distribution.
Its decay goes through the following sequence: . The radon equilibrium factor  is the ratio between the activity of all short-period radon progenies which are responsible for most of radon's biological effects , and the activity that would be at equilibrium with the radon parent.
If a closed volume is constantly supplied with radon, the concentration of short-lived isotopes will increase until an equilibrium is reached where the rate of decay of each decay product will equal that of the radon itself.
The equilibrium factor is 1 when both activities are equal, meaning that the decay products have stayed close to the radon parent long enough for the equilibrium to be reached, within a couple of hours.
Because of their electrostatic charge , radon progenies adhere to surfaces or dust particles, whereas gaseous radon does not.
Attachment removes them from the air, usually causing the equilibrium factor in the atmosphere to be less than 1. The equilibrium factor is also lowered by air circulation or air filtration devices, and is increased by airborne dust particles, including cigarette smoke.
The equilibrium factor found in epidemiological studies is 0. Radon was the fifth radioactive element to be discovered, in by Ernest Rutherford and Robert B.
Owens at McGill University in Montreal ,  after uranium, thorium, radium, and polonium. In , Friedrich Ernst Dorn reported some experiments in which he noticed that radium compounds emanate a radioactive gas he named "radium emanation" "Ra Em".
Several shortened names were soon suggested for the three emanations: exradio , exthorio , and exactinio in ;  radon Ro , thoron To , and akton or acton Ao in ;  radeon , thoreon , and actineon in ,  and eventually radon , thoron , and actinon in The likeness of the spectra of these three gases with those of argon, krypton, and xenon, and their observed chemical inertia led Sir William Ramsay to suggest in that the "emanations" might contain a new element of the noble-gas family.
In the early part of the 20th century in the US, gold contaminated with the radon daughter Pb entered the jewelry industry.
This was from gold seeds that had held Rn that had been melted down after the radon had decayed. In , Ramsay and Robert Whytlaw-Gray isolated radon and determined its melting temperature and approximate density.
In , they determined that it was the heaviest known gas. Later, when isotopes were numbered instead of named, the element took the name of the most stable isotope, radon , while Tn was renamed Rn and An was renamed Rn, which caused some confusion in the literature regarding the element's discovery as while Dorn had discovered radon the isotope, he had not been the first to discover radon the element.
As late as the s, the element was also referred to simply as emanation. The name actinon for Rn is rarely encountered today, probably due to the short half-life of that isotope.
In , Paracelsus described a wasting disease of miners, the mala metallorum , and Georg Agricola recommended ventilation in mines to avoid this mountain sickness Bergsucht.
The first major studies with radon and health occurred in the context of uranium mining in the Joachimsthal region of Bohemia. The presence of radon in indoor air was documented as early as Beginning in the s, research was initiated to address sources of indoor radon, determinants of concentration, health effects, and mitigation approaches.
In the US, the problem of indoor radon received widespread publicity and intensified investigation after a widely publicized incident in During routine monitoring at a Pennsylvania nuclear power plant, a worker was found to be contaminated with radioactivity.
A high concentration of radon in his home was subsequently identified as responsible. All discussions of radon concentrations in the environment refer to Rn.
While the average rate of production of Rn from the thorium decay series is about the same as that of Rn, the amount of Rn in the environment is much less than that of Rn because of the short half-life of Rn 55 seconds, versus 3.
One WLM is equivalent to 3. The levels of Pb can be measured. The rate of deposition of this radioisotope is weather-dependent.
Radon concentrations found in natural environments are much too low to be detected by chemical means. Radon is produced by the radioactive decay of radium, which is found in uranium ores, phosphate rock, shales, igneous and metamorphic rocks such as granite, gneiss, and schist, and to a lesser degree, in common rocks such as limestone.
Radon concentration can differ widely from place to place. Radon concentration can be much higher in mining contexts.
Radon mostly appears with the decay chain of the radium and uranium series Rn , and marginally with the thorium series Rn. The element emanates naturally from the ground, and some building materials, all over the world, wherever traces of uranium or thorium can be found, and particularly in regions with soils containing granite or shale , which have a higher concentration of uranium.
Not all granitic regions are prone to high emissions of radon. Being a rare gas, it usually migrates freely through faults and fragmented soils, and may accumulate in caves or water.
Owing to its very short half-life four days for Rn , radon concentration decreases very quickly when the distance from the production area increases.
Radon concentration varies greatly with season and atmospheric conditions. For instance, it has been shown to accumulate in the air if there is a meteorological inversion and little wind.
High concentrations of radon can be found in some spring waters and hot springs. Natural radon concentrations in the Earth's atmosphere are so low that radon-rich water in contact with the atmosphere will continually lose radon by volatilization.
Hence, ground water has a higher concentration of Rn than surface water , because radon is continuously produced by radioactive decay of Ra present in rocks.
Likewise, the saturated zone of a soil frequently has a higher radon content than the unsaturated zone because of diffusional losses to the atmosphere.
The presence of Rn has been inferred later from data obtained from the Lunar Prospector alpha particle spectrometer.
Radon is found in some petroleum. Because radon has a similar pressure and temperature curve to propane , and oil refineries separate petrochemicals based on their boiling points, the piping carrying freshly separated propane in oil refineries can become radioactive because of decaying radon and its products.
Residues from the petroleum and natural gas industry often contain radium and its daughters. The sulfate scale from an oil well can be radium rich, while the water, oil, and gas from a well often contains radon.
Radon decays to form solid radioisotopes that form coatings on the inside of pipework. High concentrations of radon in homes were discovered by chance in after the stringent radiation testing conducted at a new nuclear power plant revealed that Stanley Watras , a construction engineer at the plant, was contaminated by radioactive substances even though the reactor had never been fueled.
Some level of radon will be found in all buildings. Radon mostly enters a building directly from the soil through the lowest level in the building that is in contact with the ground.
High levels of radon in the water supply can also increase indoor radon air levels. Typical entry points of radon into buildings are cracks in solid foundations and walls, construction joints, gaps in suspended floors and around service pipes, cavities inside walls, and the water supply.
Also, the concentration in one room of a building may be significantly different from the concentration in an adjoining room.
Most of the high radon concentrations have been reported from places near fault zones ; hence the existence of a relation between the exhalation rate from faults and indoor radon concentrations is obvious.
The distribution of radon concentrations will generally differ from room to room, and the readings are averaged according to regulatory protocols.
Indoor radon concentration is usually assumed to follow a lognormal distribution on a given territory. Some of the highest radon hazard in the US is found in Iowa and in the Appalachian Mountain areas in southeastern Pennsylvania.
The second highest readings in Ireland were found in office buildings in the Irish town of Mallow, County Cork , prompting local fears regarding lung cancer.
In a few locations, uranium tailings have been used for landfills and were subsequently built on, resulting in possible increased exposure to radon.
Since radon is a colorless, odorless gas, the only way to know how much is present in the air or water is to perform tests.
In the US, radon test kits are available to the public at retail stores, such as hardware stores, for home use, and testing is available through licensed professionals, who are often home inspectors.
Efforts to reduce indoor radon levels are called radon mitigation. Radon is condensed by liquid nitrogen and purified from residue gases by sublimation.
Gaseous Rn half-life of about four days escapes from the capsule through diffusion. Radon trace concentration above oceans or in Antarctica can be lower than 0.
An earlyth-century form of quackery was the treatment of maladies in a radiotorium. The carcinogenic nature of radon due to its ionizing radiation became apparent later on.
Radon's molecule-damaging radioactivity has been used to kill cancerous cells,  but it does not increase the health of healthy cells.
The ionizing radiation causes the formation of free radicals , which results in cell damage , causing increased rates of illness, including cancer.
Exposure to radon has been suggested to mitigate autoimmune diseases such as arthritis in a process known as radiation hormesis.
The practice is discouraged because of the well-documented ill effects of high-doses of radiation on the body.
Radium-rich springs are also used in traditional Japanese onsen in Misasa , Tottori Prefecture. Drinking therapy is applied in Bad Brambach , Germany.
In the US and Europe, there are several "radon spas", where people sit for minutes or hours in a high-radon atmosphere in the belief that low doses of radiation will invigorate or energize them.
Radon has been produced commercially for use in radiation therapy, but for the most part has been replaced by radionuclides made in particle accelerators and nuclear reactors.
Radon has been used in implantable seeds, made of gold or glass, primarily used to treat cancers, known as brachytherapy. The gold seeds were produced by filling a long tube with radon pumped from a radium source, the tube being then divided into short sections by crimping and cutting.
The gold layer keeps the radon within, and filters out the alpha and beta radiations, while allowing the gamma rays to escape which kill the diseased tissue.
The activities might range from 0. Radon and its first decay products being very short-lived, the seed is left in place. At this stage, the predominant residual activity originates from the radon decay product Pb, whose half-life Radon emanation from the soil varies with soil type and with surface uranium content, so outdoor radon concentrations can be used to track air masses to a limited degree.
This fact has been put to use by some atmospheric scientists. Because of radon's rapid loss to air and comparatively rapid decay, radon is used in hydrologic research that studies the interaction between groundwater and streams.
Any significant concentration of radon in a stream is a good indicator that there are local inputs of groundwater. Radon soil-concentration has been used in an experimental way to map buried close-subsurface geological faults because concentrations are generally higher over the faults.
Some researchers have investigated changes in groundwater radon concentrations for earthquake prediction. For this reason, it has been hypothesized that increases in radon concentration is due to the generation of new cracks underground, which would allow increased groundwater circulation, flushing out radon.
The generation of new cracks might not unreasonably be assumed to precede major earthquakes. In the s and s, scientific measurements of radon emissions near faults found that earthquakes often occurred with no radon signal, and radon was often detected with no earthquake to follow.
It was then dismissed by many as an unreliable indicator. Radon is a known pollutant emitted from geothermal power stations because it is present in the material pumped from deep underground.
It disperses rapidly, and no radiological hazard has been demonstrated in various investigations.
In addition, typical systems re-inject the material deep underground rather than releasing it at the surface, so its environmental impact is minimal.
In the s and '50s, radon was used for industrial radiography. Radon decay products have been classified by the International Agency for Research on Cancer as being carcinogenic to humans,  and as a gas that can be inhaled, lung cancer is a particular concern for people exposed to elevated levels of radon for sustained periods.
During the s and s, when safety standards requiring expensive ventilation in mines were not widely implemented,  radon exposure was linked to lung cancer among non-smoking miners of uranium and other hard rock materials in what is now the Czech Republic, and later among miners from the Southwestern US    and South Australia.
During this period, several entrepreneurs opened former uranium mines in the US to the general public and advertised alleged health benefits from breathing radon gas underground.
Health benefits claimed included pain, sinus, asthma and arthritis relief,   but these were proven to be false and the government banned such advertisements in Since that time, ventilation and other measures have been used to reduce radon levels in most affected mines that continue to operate.
In recent years, the average annual exposure of uranium miners has fallen to levels similar to the concentrations inhaled in some homes.
This has reduced the risk of occupationally induced cancer from radon, although health issues may persist for those who are currently employed in affected mines and for those who have been employed in them in the past.
Residues from processing of uranium ore can also be a source of radon. Add to Basket. Body weight: Your weight in kg. Body height: Your height in cm.
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Body Weight kg :. Body Height cm :. Please select Soft Medium Hard. Cancel Delete Save. The atmosphere contains traces of radon near the ground as a result of seepage from soil and rocks , both of which contain minute quantities of radium.
Radium occurs as a natural decay product of uranium present in various types of rocks. By the late s, naturally occurring radon gas had come to be recognized as a potentially serious health hazard.
Radioactive decay of uranium in minerals, especially granite , generates radon gas that can diffuse through soil and rock and enter buildings through basements radon has a higher density than air and through water supplies derived from wells radon has a significant solubility in water.
The gas can accumulate in the air of poorly ventilated houses. Exposure to high concentrations of this radon and its daughters over the course of many years can greatly increase the risk of developing lung cancer.
Indeed, radon is now thought to be the greatest cause of lung cancer among nonsmokers in the United States. Radon levels are highest in homes built over geological formations that contain uranium mineral deposits.
Concentrated samples of radon are prepared synthetically for medical and research purposes.
Typically, a supply of radium is kept in a glass vessel in an aqueous solution or in the form of a porous solid from which the radon can readily flow.
Every few days, the accumulated radon is pumped off, purified, and compressed into a small tube, which is then sealed and removed. Such tubes of radon have been used for radiation therapy and radiography.
Natural radon consists of three isotopes, one from each of the three natural radioactive-disintegration series the uranium , thorium , and actinium series.
Discovered in by German chemist Friedrich E. Dorn, radon 3. The name radon is sometimes reserved for this isotope to distinguish it from the other two natural isotopes, called thoron and actinon, because they originate in the thorium and the actinium series, respectively.
Radon thoron; Owens and Ernest Rutherford , who noticed that some of the radioactivity of thorium compounds could be blown away by breezes in the laboratory.