Radiocarbon dating
Main article:
Radiocarbon dating
Radiocarbon dating is a radiometric dating method that uses (14C) to determine the age of carbonaceous materials up to about 60,000 years old. The technique was developed by
Willard Libby and his colleagues in 1949
[7] during his tenure as a professor at the
University of Chicago. Libby estimated that the radioactivity of exchangeable carbon-14 would be about 14 disintegrations per minute (dpm) per gram. In 1960, he was awarded the
Nobel Prize in chemistry for this work. One of the frequent uses of the technique is to date organic remains from archaeological sites. Plants fix atmospheric carbon during photosynthesis, so the level of 14C in plants and animals when they die approximately equals the level of 14C in the atmosphere at that time. However, it decreases thereafter from radioactive decay, allowing the date of death or fixation to be estimated. The initial 14C level for the calculation can either be estimated, or else directly compared with known year-by-year data from tree-ring data (
dendrochronology) to 10,000 years ago, or from cave deposits (
speleothems), to about 45,000 years of age. A calculation or (more accurately) a direct comparison with tree ring or cave-deposit carbon-14 levels, gives the wood or animal sample age-from-formation. The technique has limitations within the modern industrial era, due to fossil fuel carbon (which has little carbon-14) being released into the atmosphere in large quantities, in the past few centuries.
Линк.
Вака сега гледам тука расправии за староста на планетава фосили ова она. По кој метод е утврдена староста на оваа планета?
Популарниот метод на утврдување на староста на Јаглерод Ц -14 утврдува најмногу старост до 60000 години теоретски.
Секогаш кога ќе слушните на телевизија дека е пронајден фосил од диносаурус стар неколку милиони години утврден по Ц-14 метода е
лага, дури и Википедиа го знае тоа.