Därför användes Pu 238 bara i obemannade rymdsonder så länge man till att driva en radioisotopreaktor (RTG) som kunde omvandla värmen till elektricitet.
Pu-238, in pellet form, produces heat that the rover's multi-mission radioisotope thermoelectric generator converts to electricity. Its long half-life makes it ideal for deep-space travel.
The pellets for the RTG heat sources were encapsulated in iridium cladding provid-ed by ORNL. The encapsulated fuel pellets were shipped from LANL to the Mound Plant where they were assembled into heat sources. Mound completed the RTG assembly by in-stalling a stack of heat sources into Pu-238-fueled RTG in space missions. It employs three RTGs, each holding 24 Pu-238 oxide fuel packets, which together emitted enough heat to generate a maximum of 470 watts of electrical power at the beginning of the mission. This allowed Voyager 2 to study Jupiter, Saturn, Uranus and Neptune at close range and relay unparalleled scientific data Modèles de RTG au Pu-238 Les générateurs RTG au plutonium-238 ont été utilisés depuis 1961 par la NASA pour son programme spatial.
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1990-10-06 · Last year's launch of Galileo also used 238pu to power its instruments. The 23 Pu has been used in devices called radioisotope thermoelectric generators (RIGs), which use the heat of radioactive decay to cause an electric current to flow through specially designed bi·metallic interfaces.
Massöverskotten för 235U och 238U är 40.9155 MeV och 47.3060 MeV. (4p). b) Om verkningsgraden (värme till el) på de använda RTG:na är 5%, hur många
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The isotope's half-life of 88 years and stability at high temperatures make it ideal for the conditions under which an RTG must operate. Additionally, Pu-238 requires minimal shielding equivalent to that of a piece of paper, and its low levels of radioactivity mean that instruments and equipment are unaffected. 2013-04-24
1996-09-01
A plot of the power degradation.
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Pu-238 Savings Generator Efficiency (%) Mass savings Specific Fuel Efficiency (W Specific Fuel Efficiency (W e /kg Pu-238) /kg Pu-238) MMRTG GPHS RTG Advanced Thermoelectrics (Deep space only) TPV Advanced Concepts SRG 110 (Redirected) ASRG PRE-DECISIONAL. FOR PLANNING PURPOSES ONLY 7 Origin Of The ASRG and MMRTG New NASA Directives Do smaller
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