774–775 carbon-14 spike
id:
774-775-carbon-14-spike-216-4688393
title:
774–775 carbon-14 spike
text:
The 774–775 carbon-14 spike is an observed increase of around 1.2% in the concentration of the radioactive carbon-14 isotope in tree rings dated to 774 or 775 CE, which is about 20 times higher than the normal year-to-year variation of radiocarbon in the atmosphere. It was discovered during a study of Japanese cedar tree-rings, with the year of occurrence determined through dendrochronology. A surge in beryllium isotope ⁱ⁰Be, detected in Antarctic ice cores, has also been associated with the 774
brand slug:
wiki
category slug:
encyclopedia
description:
Observed increase concentration of carbon-14 in tree rings dated 774 or 775
original url:
https://en.wikipedia.org/wiki/774%E2%80%93775_carbon-14_spike
date created:
2012-06-07T02:56:46Z
date modified:
2024-09-12T22:42:32Z
main entity:
{"identifier":"Q4643553","url":"https://www.wikidata.org/entity/Q4643553"}
image:
{"content_url":"https://upload.wikimedia.org/wikipedia/commons/f/f4/Time_profile_of_the_774_AD_spike_in_C-14..jpg","width":944,"height":697}
fields total:
13
integrity:
16