Most carbon-14 quickly combines with oxygen to form radioactive carbon dioxide, which then spreads throughout the atmosphere.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 .When creation scientists studied granite samples, they made interesting discoveries.The samples were from a mile below the earth, which, according to inflated evolutionary years, were 1.5 billion years old.As explained in recent measurements show that the ratio of carbon-14 to carbon-12 has been building up in the atmosphere.However, for the last 3,500 years, the increase in the ratio has been extremely slight.
Half of it will decay in about 5,730 years to form nitrogen.
The helium still locked in the samples was studied as well as the rate at which the helium diffused from the rock.
They concluded that the helium in the rock was 100,000 times more plentiful than it should have been if the rocks were really 1.5 billion years old.
With less carbon-12 to dilute the carbon-14 continually forming from nitrogen in the upper atmosphere, the ratio of carbon-14 to carbon-12 in the atmosphere would increase.
If the atmosphere's ratio of carbon-14 to carbon-12 has doubled since the flood and we did not know it, radiocarbon ages of things living soon after the flood would appear to be one half-life (or 5,730 years) older than their true ages.