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Die Abkürzung RTG steht für: IATA-Code für den Flughafen von Ruteng, Indonesien; Radioisotope Thermoelectric Generator, eine Radionuklidbatterie · Rame à. Eine Radionuklidbatterie, auch Radioisotopengenerator, Isotopenbatterie, Atombatterie oder kurz RTG (für radioisotope thermoelectric generator), wandelt​. Ziel des Zusammenschlusses ist die Stärkung der Wettbewerbsfähigkeit der Partner, indem sie individuelle Stärken in der RTG gemeinsam bündeln. RTG Dr. Rümmele Steuerberatung und Wirtschaftsprüfung GmbH & Co KG | Marktstraße 30 A Dornbirn | T 0 | F - 44 | E [email protected] RTG Connect. Die Weiterentwicklung unserer digitalen Services steht für uns an oberster Stelle. Unsere Internet-Plattform raptorforum.nlt ermöglicht:

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RTG Retail Trade Group GmbH - St. Wendel / Düsseldorf / Hamburg (ots) - Globus und METRO Deutschland werden Mitglied der RTG Retail. Förderverein. © Nie ; Impressum · Datenschutzerklärung. RTG; Berufswahl Sigel; RTG; Sparkasse; zdi; Schule der Zukunft. Eigentlich wollte das RTG im Juli wieder einen vielfältigen UNESCO-Projekttag mit verschiedenen Angeboten veranstalten. Doch ein solch buntes Treiben ist. RTG Retail Trade Group GmbH - St. Wendel / Düsseldorf / Hamburg (ots) - Globus und METRO Deutschland werden Mitglied der RTG Retail. Förderverein. © Nie ; Impressum · Datenschutzerklärung. RTG; Berufswahl Sigel; RTG; Sparkasse; zdi; Schule der Zukunft. Eigentlich wollte das RTG im Juli wieder einen vielfältigen UNESCO-Projekttag mit verschiedenen Angeboten veranstalten. Doch ein solch buntes Treiben ist. Die Ruhr Tourismus GmbH. Die Ruhrgebiet Tourismus GmbH (RTG) wurde am gegründet mit dem Ziel der Bündelung von Produktentwicklung. Globus und Metro Deutschland werden neue Mitglieder der Handelskooperation Retail Trade Group (RTG). Jochen Baab (Foto), Sprecher der.

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All rights reserved. A radioisotope thermoelectric generator RTG , RITEG is an electricity generating device that uses an array of thermocouples to convert the heat released by the decay of a suitable radioactive material into electricity by the Seebeck effect.

This generator has no moving parts. RTGs have been used as power sources in satellites , space probes , and uncrewed remote facilities such as a series of lighthouses built by the former Soviet Union inside the Arctic Circle.

RTGs are usually the most desirable power source for unmaintained situations that need a few hundred watts or less of power for durations too long for fuel cells , batteries, or generators to provide economically, and in places where solar cells are not practical.

Safe use of RTGs requires containment of the radioisotopes long after the productive life of the unit. The expense of RTGs tend to limit their use to niche applications in rare or special situations.

They were inducted into the National Inventors Hall of Fame in The project was led by Dr. Bertram C. RTGs were used at that site until A common RTG application is spacecraft power supply.

In addition to spacecraft, the Soviet Union constructed many uncrewed lighthouses and navigation beacons powered by RTGs.

In the past, small "plutonium cells" very small Pu-powered RTGs were used in implanted heart pacemakers to ensure a very long "battery life". By the end of , the number was reported to be down to just nine.

The design of an RTG is simple by the standards of nuclear technology : the main component is a sturdy container of a radioactive material the fuel.

Thermocouples are placed in the walls of the container, with the outer end of each thermocouple connected to a heat sink.

Radioactive decay of the fuel produces heat. It is the temperature difference between the fuel and the heat sink that allows the thermocouples to generate electricity.

A thermocouple is a thermoelectric device that can convert thermal energy directly into electrical energy , using the Seebeck effect. It is made of two kinds of metal or semiconductors that can both conduct electricity.

If they are connected to each other in a closed loop and the two junctions are at different temperatures , an electric current will flow in the loop.

Typically a large number of thermocouples are connected in series to generate a higher voltage. Inspection of Cassini spacecraft RTGs before launch.

The first two criteria limit the number of possible fuels to fewer than thirty atomic isotopes [10] within the entire table of nuclides.

Plutonium , curium and strontium are the most often cited candidate isotopes, but other isotopes such as polonium , promethium , caesium , cerium , ruthenium , cobalt , curium , americium and thulium isotopes have also been studied.

Plutonium has a half-life of This emission rate is relatively high compared to the neutron emission rate of plutonium metal.

These neutrons are produced by the spontaneous fission of plutonium The difference in the emission rates of the metal and the oxide is due mainly to the alpha, neutron reaction with the oxygen and oxygen present in the oxide.

The normal amount of oxygen present in the natural form is 0. The reduction of the oxygen and oxygen present in plutonium dioxide will result in a much lower neutron emission rate for the oxide; this can be accomplished by a gas phase 16 O 2 exchange method.

Regular production batches of PuO 2 particles precipitated as a hydroxide were used to show that large production batches could be effectively 16 O 2 -exchanged on a routine basis.

High-fired PuO 2 microspheres were successfully 16 O 2 -exchanged showing that an exchange will take place regardless of the previous heat treatment history of the PuO 2.

For production of the large heat sources the shielding required would have been prohibitive without this process. Unlike the other three isotopes discussed in this section, Pu must be specifically synthesized and is not abundant as a nuclear waste product.

If this plan is funded, the goal would be to set up automation and scale-up processes in order to produce an average of 1.

While its half life of Americium is a potential candidate isotope with a longer half-life than Pu: Am has a half-life of years and could hypothetically power a device for centuries.

Prototype designs of Am RTGs expect Most RTGs use Pu, which decays with a half-life of RTGs using this material will therefore diminish in power output by a factor of 1—0.

In the year , 23 years after production, the radioactive material inside the RTG had decreased in power by NASA is developing a Multi-Mission Radioisotope Thermoelectric Generator in which the thermocouples would be made of skutterudite , a cobalt arsenide CoAs 3 , which can function with a smaller temperature difference than the current tellurium -based designs.

RTGs use thermoelectric generators to convert heat from the radioactive material into electricity. Thermoelectric materials in space missions to date have included silicon—germanium alloys, lead telluride and tellurides of antimony, germanium and silver TAGS.

Studies have been done on improving efficiency by using other technologies to generate electricity from heat. Achieving higher efficiency would mean less radioactive fuel is needed to produce the same amount of power, and therefore a lighter overall weight for the generator.

This is a critically important factor in spaceflight launch cost considerations. Some prototype Po RTGs have used thermionics, and potentially other extremely radioactive isotopes could also provide power by this means, but short half-lives make these unfeasible.

Several space-bound nuclear reactors have used thermionics, but nuclear reactors are usually too heavy to use on most space probes. Thermophotovoltaic cells work by the same principles as a photovoltaic cell , except that they convert infrared light emitted by a hot surface rather than visible light into electricity.

Thermophotovoltaic cells have an efficiency slightly higher than thermoelectric modules TEMs and can be overlaid on top of themselves, potentially doubling efficiency.

Thermophotovoltaic cells and silicon TEMs degrade faster than metal TEMs, especially in the presence of ionizing radiation.

Dynamic generators can provide power at more than four times the conversion efficiency of RTGs. Greater efficiency can be achieved by increasing the temperature ratio between the hot and cold ends of the generator.

The use of non-contacting moving parts, non-degrading flexural bearings , and a lubrication-free and hermetically sealed environment have, in test units, demonstrated no appreciable degradation over years of operation.

Experimental results demonstrate that an SRG could continue running for decades without maintenance.

Vibration can be eliminated as a concern by implementation of dynamic balancing or use of dual-opposed piston movement. Potential applications of a Stirling radioisotope power system include exploration and science missions to deep-space, Mars, and the Moon.

The increased efficiency of the SRG may be demonstrated by a theoretical comparison of thermodynamic properties, as follows. These calculations are simplified and do not account for the decay of thermal power input due to the long half-life of the radioisotopes used in these generators.

The assumptions for this analysis include that both systems are operating at steady state under the conditions observed in experimental procedures see table below for values used.

Both generators can be simplified to heat engines to be able to compare their current efficiencies to their corresponding Carnot efficiencies.

The system is assumed to be the components, apart from the heat source and heat sink. This yields a Second Law efficiency of Radioactive materials contained in RTGs are dangerous and can even be used for malicious purposes.

They are barely useful for a genuine nuclear weapon , but still can serve in a " dirty bomb ". The Soviet Union constructed many uncrewed lighthouses and navigation beacons powered by RTGs using strontium 90 Sr.

They are very reliable and provide a steady source of power. Most have no protection, not even fences or warning signs, and the locations of some of these facilities are no longer known due to poor record keeping.

In one instance, the radioactive compartments were opened by a thief. The units were eventually recovered and isolated.

Most of these RTGs likely no longer function, and may need to be dismantled. Some of their metal casings have been stripped by metal hunters, despite the risk of radioactive contamination.

RTGs pose a risk of radioactive contamination : if the container holding the fuel leaks, the radioactive material may contaminate the environment.

For spacecraft, the main concern is that if an accident were to occur during launch or a subsequent passage of a spacecraft close to Earth, harmful material could be released into the atmosphere; therefore their use in spacecraft and elsewhere has attracted controversy.

However, this event is not considered likely with current RTG cask designs. For instance, the environmental impact study for the Cassini—Huygens probe launched in estimated the probability of contamination accidents at various stages in the mission.

The probability of an accident occurring which caused radioactive release from one or more of its 3 RTGs or from its radioisotope heater units during the first 3.

To minimize the risk of the radioactive material being released, the fuel is stored in individual modular units with their own heat shielding.

They are surrounded by a layer of iridium metal and encased in high-strength graphite blocks. These two materials are corrosion- and heat-resistant.

Surrounding the graphite blocks is an aeroshell, designed to protect the entire assembly against the heat of reentering the Earth's atmosphere.

The plutonium fuel is also stored in a ceramic form that is heat-resistant, minimising the risk of vaporization and aerosolization.

The ceramic is also highly insoluble. The plutonium used in these RTGs has a half-life of A consequence of the shorter half-life is that plutonium is about times more radioactive than plutonium i.

For instance, 3. Since the morbidity of the two isotopes in terms of absorbed radioactivity is almost exactly the same, [35] plutonium is around times more toxic by weight than plutonium The alpha radiation emitted by either isotope will not penetrate the skin, but it can irradiate internal organs if plutonium is inhaled or ingested.

Particularly at risk is the skeleton , the surface of which is likely to absorb the isotope, and the liver , where the isotope will collect and become concentrated.

There have been several known accidents involving RTG-powered spacecraft:. One RTG, the SNAPC, was lost near the top of Nanda Devi mountain in India in when it was stored in a rock formation near the top of the mountain in the face of a snowstorm before it could be installed to power a CIA remote automated station collecting telemetry from the Chinese rocket testing facility.

The seven capsules [40] were carried down the mountain onto a glacier by an avalanche and never recovered.

It is most likely that they melted through the glacier and were pulverized, whereupon the plutonium zirconium alloy fuel oxidized soil particles that are moving in a plume under the glacier.

Several of these units have been illegally dismantled for scrap metal resulting in the complete exposure of the Sr source , fallen into the ocean, or have defective shielding due to poor design or physical damage.

The US Department of Defense cooperative threat reduction program has expressed concern that material from the Beta-M RTGs can be used by terrorists to construct a dirty bomb.

RTGs and fission reactors use very different nuclear reactions. Nuclear power reactors including the miniaturized ones used in space perform controlled nuclear fission in a chain reaction.

The rate of the reaction can be controlled with neutron absorbing control rods , so power can be varied with demand or shut off almost entirely for maintenance.

However, care is needed to avoid uncontrolled operation at dangerously high power levels, or even explosion or nuclear meltdown.

Chain reactions do not occur in RTGs. Heat is produced through spontaneous radioactive decay at a non-adjustable and steadily decreasing rate that depends only on the amount of fuel isotope and its half-life.

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