Fission-Tracks

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• Fission track dating — is a radiometric dating technique based on analyses of the damage trails, or tracks, left by fission fragments in certain uranium bearing minerals and glasses. Uranium 238 undergoes spontaneous fission decay at a known rate. The fragments emitted …   Wikipedia

• fission-track dating — Method of determining the age of a mineral that utilizes the damage done by the spontaneous fission of uranium 238, the most abundant isotope of uranium. The fission results in radiation damage, or fission tracks, that can be made visible by… …   Universalium

• Fission product — Fission products are the atomic fragments left after a large nucleus fissions. Typically, a large nucleus like Uranium fissions by splitting into two smaller nuclei, along with a few neutrons and a large release of energy in the form of heat… …   Wikipedia

• Fission Track Dating — (Spaltspurendatierung) ist eine radiometrische Methode zur Datierung der Abkühlgeschichte von Gesteinen anhand von bestimmten, in den Gesteinen enthaltenen Mineralen (Thermochronologie). Spaltspuren sind mikrometergroße Defektlinien (engl.… …   Deutsch Wikipedia

• fission-track dating — noun Gauging the date of a mineral by counting tracks made in it by uranium fission products • • • Main Entry: ↑fission …   Useful english dictionary

• Spontaneous fission — (SF) is a form of radioactive decay characteristic of very heavy isotopes, and is theoretically possible for any atomic nucleus whose mass is greater than or equal to 100 u (elements near ruthenium). In practice, however, spontaneous fission is… …   Wikipedia

• Nuclear fission product — Nuclear fission products are the atomic fragments left after a large atomic nucleus fissions. Typically, a large nucleus like that of uranium fissions by splitting into two smaller nuclei, along with a few neutrons and a large release of energy… …   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

• Radiometric dating — (often called radioactive dating) is a technique used to date materials such as rocks, usually based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products, using known decay rates.[1]… …   Wikipedia

• Extraterrestrial materials — Most atoms on earth came from the interstellar dust and gas from which the sun and solar system formed. However, in the space science community extraterrestrial materials generally refers to objects now on earth that were solidified prior to… …   Wikipedia

• Apatite — Not to be confused with appetite. Apatite General Category Phosphate mineral group Chemical form …   Wikipedia