About: 774–775 carbon-14 spike   Sponge Permalink

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The 774–775 Carbon-14 Spike is an observed increase of 1.2% in the concentration of[carbon-14 isotope in tree rings dated to the years 774 or 775 CE, which is about 20 times as high as the normal background rate of variation. It was discovered during a study of Japanese cedar trees, with the year of occurrence determined through dendrochronology. A surge in a specific isotope of beryllium (10Be), detected in Antarctic ice cores, has also been associated with the 774–775 event.

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  • 774–775 carbon-14 spike
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  • The 774–775 Carbon-14 Spike is an observed increase of 1.2% in the concentration of[carbon-14 isotope in tree rings dated to the years 774 or 775 CE, which is about 20 times as high as the normal background rate of variation. It was discovered during a study of Japanese cedar trees, with the year of occurrence determined through dendrochronology. A surge in a specific isotope of beryllium (10Be), detected in Antarctic ice cores, has also been associated with the 774–775 event.
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abstract
  • The 774–775 Carbon-14 Spike is an observed increase of 1.2% in the concentration of[carbon-14 isotope in tree rings dated to the years 774 or 775 CE, which is about 20 times as high as the normal background rate of variation. It was discovered during a study of Japanese cedar trees, with the year of occurrence determined through dendrochronology. A surge in a specific isotope of beryllium (10Be), detected in Antarctic ice cores, has also been associated with the 774–775 event. The event appears to have been global, with the same carbon-14 signal found in tree rings from Germany, Russia, the United States, and New Zealand. A "red crucifix" was recorded by the Anglo-Saxon Chronicle as appearing in the skies of Britain for the year 774; since no supernova remnant has been found for this year, it is interpreted as an aurora borealis. The signal exhibits a sharp increase of ~1.2% followed by a slow decline (see Figure 1), which is typical for an instant production of carbon-14 in the atmosphere, indicating that the event was short in duration. The globally averaged production of carbon-14 for this event is calculated as Q= (1.1-1.5)×108 atoms/cm2.
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