Radon Sunset

Radon Sunset

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Radon Sunset

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Radon can also occur in ground water — for example, in some spring waters and hot springs. Epidemiological studies have shown a clear link between breathing high concentrations of radon and incidence of lung cancer.

Radon is a contaminant that affects indoor air quality worldwide. According to the United States Environmental Protection Agency EPA , radon is the second most frequent cause of lung cancer, after cigarette smoking, causing 21, lung cancer deaths per year in the United States.

About 2, of these deaths occur among people who have never smoked. While radon is the second most frequent cause of lung cancer, it is the number one cause among non-smokers, according to EPA policy-oriented estimates.

Radon is a colorless, odorless, and tasteless [8] gas and therefore is not detectable by human senses alone. At standard temperature and pressure , radon forms a monatomic gas with a density of 9.

Radon is appreciably more soluble in organic liquids than in water. Radon is a member of the zero- valence elements that are called noble gases, and is chemically not very reactive.

However, the 3. Because radon is a gas at standard conditions, unlike its decay-chain parents, it can readily be extracted from them for research.

It is inert to most common chemical reactions, such as combustion , because the outer valence shell contains eight electrons. This produces a stable, minimum energy configuration in which the outer electrons are tightly bound.

Early studies concluded that the stability of radon hydrate should be of the same order as that of the hydrates of chlorine Cl 2 or sulfur dioxide SO 2 , and significantly higher than the stability of the hydrate of hydrogen sulfide H 2 S.

Because of its cost and radioactivity, experimental chemical research is seldom performed with radon, and as a result there are very few reported compounds of radon, all either fluorides or oxides.

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 ; [22] 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: [32]. The radon equilibrium factor [35] 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 , [38] 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 ; [50] radon Ro , thoron To , and akton or acton Ao in ; [51] radeon , thoreon , and actineon in , [52] 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, [98] 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.

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I confirm that I read and accepted the privacy policy. Send review. Radon Dropout Nevertheless, by comparing reactions of radon with those of krypton and xenon it has been possible to deduce that radon forms a difluoride, RnF 2 , and derivatives of the difluoride.

The chemical behaviour of radon is similar to that of a metal fluoride and is consistent with its position in the periodic table as a metalloid element.

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The Editors of Encyclopaedia Britannica Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree See Article History.

Alternative Titles: Rn, niton, radium emanation. Britannica Quiz. Periodic Table Quiz. Get exclusive access to content from our First Edition with your subscription.

Subscribe today. Learn More in these related Britannica articles:. Radon escapes from the ground and enters the environment in varying amounts.

The presence of radon gas as a member of the uranium-decay scheme provides a unique method for creating disequilibrium.

The gas radon Rn escapes from the ground and decays rapidly in the atmosphere to lead Pb , which falls quickly to the surface where it is incorporated in glacial….

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Um einen Artikel zu bewerten, bitte zunächst im Kundenkonto anmelden. Fünf Millimeter ist der Vorderreifen Www.Paysafecard.Com Shop Und als der am Heck. Durch die weitere Nutzung unserer Seite erklären Sie sich mit der Verwendung von Cookies einverstanden. Artikel Finanzierung Maximallaufzeit. Sattelstütze Satori Harmony LT2, Fünf Millimeter ist der Vorderreifen schmaler als der am Heck. Mehr erfahren. The practice is discouraged because of the well-documented ill effects of high-doses of radiation on the body. This produces a stable, minimum energy configuration in which the outer electrons are tightly bound. Ring Hells Angels that time, ventilation and other measures have been used to reduce radon levels in most affected mines that continue to operate. Bibcode : PCCP Radium occurs as a natural this web page product of uranium present in various types of rocks.

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Radon Sunset 9. Pedals not included. Testbericht als PDF downloaden. Ein in jeder Hinsicht fantastisches Rad. Ulteriori modelli 28". Ein in jeder Hinsicht fantastisches Rad. Radon Sunset Annales de Physique. Radon is go here contaminant that affects indoor air quality worldwide. Generally, the indoor radon concentrations increase as ventilation rates decrease. Beste Spielothek in Eresing finden 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. For most people, radon is the single largest source of radiation exposure whether they are at home or at work. Because radon has a similar pressure and temperature curve to propaneand click to see more 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. Medical Physics. A well known example of source of error is smoking, are Ogame Deutsch not main risk factor for lung cancer. Theoretical studies on this molecule predict that it should have a Rn—F bond distance of 2. Physical Chemistry Chemical Physics.

Main article: Radon mitigation. Chemistry portal. Public Health Service, In collaboration with U. Environmental Protection Agency, December Geological Hazards: A Sourcebook.

Greenwood Press. Facts about. Archived from the original on Retrieved United States Environmental Protection Agency.

October 12, Retrieved January 29, Journal of Radiation Research. Jefferson Lab. Noble Gases.

Marshall Cavendish. Radioactive Elements and Artificial Radionuclides". Ullmann's Encyclopedia of Industrial Chemistry.

Weinheim: Wiley-VCH. McMaster University. Lide Russian Chemical Reviews. Bibcode : RuCRv.. Bibcode : Sci Chemical Communications.

Radiochimica Acta. The Journal of Physical Chemistry A. Bibcode : JPCA.. Physical Chemistry Chemical Physics. Bibcode : PCCP Journal of Fluorine Chemistry.

Advances in Inorganic Chemistry. Academic Press. Relativistic Methods for Chemists. Challenges and Advances in Computational Chemistry and Physics.

Chemical Reviews. International Journal of Quantum Chemistry. The New York Times. Molecular calculations on the hydrides of Hg to At and the fluorides of Rn".

Molecular Physics. Bibcode : MolPh.. Journal of Physical and Chemical Reference Data. Physical Review Letters. Bibcode : PhRvL.

June Archived from the original PDF on National Academies Press. Abhandlungen der Naturforschenden Gesellschaft zu Halle in German. Bibcode : Natur.

The New York Times Company. Medical Physics. Bibcode : MedPh.. Marie Chemische Berichte in German. Norman Proceedings of the Royal Society.

Zeitschrift für anorganische und allgemeine Chemie in German. Annales de Physique. IX in French. Journal of the American Chemical Society.

Oak Ridge Associated Universities. Gray; W. Ramsay Nature Chemistry. Bibcode : NatCh Journal of Inorganic and Nuclear Chemistry.

The Nazi War on Cancer. Princeton University Press, p. Radon's deadly daughters: science, environmental policy, and the politics of risk.

Estimating the risks". The Western Journal of Medicine. Journal of Environmental Radioactivity. November The Linde Group.

Un gaz radioactif naturel" in French. Indoor Environmental Quality. CRC Press. Alan Moghissi Environmental Protection Agency.

Environmental Management and Health. William; Lynch, Charles F. Environmental Health Perspectives. Archived from the original on May 8, United States Geological Survey.

Lancaster University. Bibcode : JGRE.. National Energy Board. April Ecohouse: A Design Guide. Lawrence Berkeley National Laboratory.

National Institute of Standards and Technology. Kishore Methods Phys. United States Government. September 27—30, International Radon Symposium.

In Greenberg, Michael I. Occupational, industrial, and environmental toxicology 2nd ed. Louis, Missouri: Mosby.

Retrieved 28 November Toxicological Profile for Radon. Illinois Homeopathic Medical Association.

Roadside America. Journal of Radioanalytical and Nuclear Chemistry. National Geographic. Archived from the original on January 7, Klinger; P.

Tapponnier; C. Li; J. Perrier Bibcode : RadM Journal of Physics of the Earth. Earthquake chemistry II, collected papers, edn, Vol. Geophysical Research Letters.

Bibcode : GeoRL.. Its Properties and Preparation for Industrial Radiography". Journal of Scientific Instruments. Bibcode : JScI Canadian Journal of Research.

American Cancer Society. A Century of X-rays and Radioactivity in Medicine. Journal of the American Medical Association. Annals of Oncology.

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Info Print Cite. Submit Feedback. Thank you for your feedback. Home Science Chemistry. The Editors of Encyclopaedia Britannica Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree See Article History.

Alternative Titles: Rn, niton, radium emanation. Britannica Quiz. Periodic Table Quiz. Get exclusive access to content from our First Edition with your subscription.

Subscribe today. Learn More in these related Britannica articles:. Radon escapes from the ground and enters the environment in varying amounts.

The presence of radon gas as a member of the uranium-decay scheme provides a unique method for creating disequilibrium. The gas radon Rn escapes from the ground and decays rapidly in the atmosphere to lead Pb , which falls quickly to the surface where it is incorporated in glacial….

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Radon Sunset -

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