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- Krypton-85 abstract "Krypton 85 (85Kr) is a radioisotope of krypton.It decays into stable rubidium-85, with a half-life of 10.756 years and a maximum decay energy of 687 keV.Its most common decay (99.57%) is by beta particle emission with maximum energy of 687keV and an average energy of 251 keV. The second most common (0.43%) is by beta particleemission (maximum energy of 173 keV) followed by gamma ray emission (energy of 514 keV).In terms of radiotoxicity, 440 Bq of Kr-85 is equivalent to 1 Bq of radon-222, without considering the rest of the radon decay chain. Other decay modes have very small probabilities and emit less energetic gammas.The only other long-lived radioisotope of krypton is krypton-81 with a 210,000 year half-life; others have half-lives of less than two days.Krypton-85 is produced in small quantities by the interaction of cosmic rays with the stable krypton-84 (which is present in concentrations of about 1 cm3 per cubic meter). However, since the mid-1940s, much larger quantities have been artificially produced as a product of nuclear fission. When uranium-235, or another fissile nucleus fissions, it usually splits into two large fragments (fission products) with mass numbers of 90–140, and two or three neutrons. About three atoms of krypton-85 are produced for every 1000 fissions (i.e. it has a fission yield of 0.3%). This is only about 20% of the total fission product of mass 85, as most decay from a short-lived excited state of 85Kr directly to 85Rb without passing through the longer-lived nuclear isomer.About 5 megacuries (180 PBq) of the isotope was released into the atmosphere as a result of nuclear weapons tests between 1945 and the end of atmospheric testing in 1962. The 1979 accident at the Three Mile Island nuclear power plant released about 50 kilocuries (1,800 TBq) of Kr-85 into the atmosphereand the Chernobyl accident released about 5 megacuries (180 PBq).The atmospheric concentration of krypton-85 peaked in around 1970, when it reached ca. 10 pCi/m3 (approximately 0.4 Bq/m3). Since then the cessation of atmospheric weapons tests and the reduced production of plutonium has, because of the short half-life of the isotope, led to a sharp reduction in the atmospheric concentration, according to the Human Health Fact Sheet.For wide-area atmospheric monitoring, krypton-85 is the best indicator for clandestine plutonium separations.A large nuclear power plant produces about 300 kilocuries (11,000 TBq) of the isotope per year, most or all retained in the spent nuclear fuel rods. Nuclear reprocessing currently releases Kr-85 to the atmosphere when the spent fuel is dissolved. It would also be possible to capture and store it as nuclear waste or for use.".
- Krypton-85 wikiPageID "4085623".
- Krypton-85 wikiPageRevisionID "594851706".
- Krypton-85 alternateNames "Krypton".
- Krypton-85 background "#7F7".
- Krypton-85 decayEnergy "0.687".
- Krypton-85 decayMode Beta_decay.
- Krypton-85 halflife "3.3943354559999996E8".
- Krypton-85 hasPhotoCollection Krypton-85.
- Krypton-85 mass "84.9125273".
- Krypton-85 massNumber "85".
- Krypton-85 numNeutrons "49".
- Krypton-85 numProtons "36".
- Krypton-85 spin "9".
- Krypton-85 symbol "Kr".
- Krypton-85 subject Category:Fission_products.
- Krypton-85 subject Category:Isotopes_of_krypton.
- Krypton-85 comment "Krypton 85 (85Kr) is a radioisotope of krypton.It decays into stable rubidium-85, with a half-life of 10.756 years and a maximum decay energy of 687 keV.Its most common decay (99.57%) is by beta particle emission with maximum energy of 687keV and an average energy of 251 keV.".
- Krypton-85 label "Crípton 85".
- Krypton-85 label "Krypton-85".
- Krypton-85 label "Krypton-85".
- Krypton-85 sameAs Krypton-85.
- Krypton-85 sameAs Crípton_85.
- Krypton-85 sameAs m.03yxmy5.
- Krypton-85 sameAs Q2219142.
- Krypton-85 sameAs Q2219142.
- Krypton-85 wasDerivedFrom Krypton-85?oldid=594851706.
- Krypton-85 isPrimaryTopicOf Krypton-85.