long-lived radioisotope

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• Krypton-85 — Infobox isotope alternate names = symbol =Kr mass number =85 mass =84.9125273(21) num neutrons =49 num protons =36 abundance = halflife =10.756 years error halflife = background =#7F7 text color = decay product = decay symbol = decay mass = decay …   Wikipedia

• Isotopes of samarium — Naturally occurring samarium (Sm) is composed of 4 stable isotopes, 144Sm, 150Sm, 152Sm and 154Sm, and 3 extremely long lived radioisotopes, 147Sm (1.06e|11y), 148Sm (7e|15y) and 149Sm (>2e|15y), with 152Sm being the most abundant (26.75% natural …   Wikipedia

• Isotopes of zirconium — Naturally occurring zirconium (Zr) is composed of four stable isotopes, and one extremely long lived radioisotope (96Zr), which decays via double beta decay with the observed half life of 2.0×1019 years [http://www.nndc.bnl.gov/bbdecay/list.html] …   Wikipedia

• spacecraft — /spays kraft , krahft /, n. a vehicle designed for travel or operation in space beyond the earth s atmosphere or in orbit around the earth. [1955 60; SPACE + CRAFT] * * * Vehicle designed to operate, with or without a crew, in a controlled flight …   Universalium

• Radioactive waste — 2007 ISO radioactivity danger logo, designed in part for long term radioactive waste depositories which might survive into a far future time in which all knowledge of the meaning of present common radiation danger symbols and signs has been lost… …   Wikipedia

• Environmental radioactivity — is produced by radioactive materials in the human environment. While some radioisotopes, such as strontium 90 (90Sr) and technetium 99 (99Tc), are only found on Earth as a result of human activity, and some, like potassium 40 (40K), are only… …   Wikipedia

• dating — I In geology and archaeology, the process of determining an object s or event s place within a chronological scheme. Scientists may use either relative dating, in which items are sequenced on the basis of stratigraphic clues (see stratigraphy) or …   Universalium

• Nuclear fuel cycle — The nuclear fuel cycle, also called nuclear fuel chain, is the progression of nuclear fuel through a series of differing stages. It consists of steps in the front end, which are the preparation of the fuel, steps in the service period in which… …   Wikipedia

• radiation — radiational, adj. /ray dee ay sheuhn/, n. 1. Physics. a. the process in which energy is emitted as particles or waves. b. the complete process in which energy is emitted by one body, transmitted through an intervening medium or space, and… …   Universalium

• Curium — This article is about the chemical element. For the ancient city located in Cyprus, see Kourion. americium ← curium → berkelium …   Wikipedia

• Radionuclide — A radionuclide is an atom with an unstable nucleus, which is a nucleus characterized by excess energy available to be imparted either to a newly created radiation particle within the nucleus or to an atomic electron. The radionuclide, in this… …   Wikipedia