Radiocarbon dating wood
All samples, to be analyzed, should be clean, dry, bagged, and labeled C-14 Sample submission form & details, should be filled out printed, and posted with the samples).
The most common radioactive element in granite is Uranium-238.Plants take in carbon dioxide, incorporating in their tissues both carbon-14 (unstable) and normal carbon-12 (stable) in the same proportion as they occur in the atmosphere .Carbon-14 then moves up the various food chains to enter animal tissueagain, in about the same ratio carbon-14 has with carbon-12 in the atmosphere.The samples were from a mile below the earth, which, according to inflated evolutionary years, were 1.5 billion years old.The helium still locked in the samples was studied as well as the rate at which the helium diffused from the rock.The key questions then are: Has the atmospheric ratio of carbon-14 to carbon-12 changed in the past, and if so, why and how much?
The assumption usually made, but rarely acknowledged, is that the ratio of carbon-14 to carbon-12 in the atmosphere before the industrial revolution has always been the sameabout one in a trillion.
Sample size supposed to be recommended for analysis.
Multi-sample discounts are offered for batches of submitted samples for conventional radiocarbon dating.
Cosmic radiation striking the upper atmosphere converts about 21 pounds of nitrogen each year into radiocarbon (carbon-14).
Most carbon-14 quickly combines with oxygen to form radioactive carbon dioxide, which then spreads throughout the atmosphere.
When a living thing dies, its radiocarbon loss (decay) is no longer balanced by intake, so its radiocarbon steadily decreases with a half-life of 5,730 years.