So, the fossil is 8,680 years old, meaning the living organism died 8,680 years ago.
For some reason, which I have not yet figured out, at least one person per week has been asking me about the Carbon-14 Radiometric Dating Technique.
When an organism dies it ceases to replenish carbon in its tissues and the decay of carbon 14 to nitrogen 14 changes the ratio of carbon 12 to carbon 14.
Experts can compare the ratio of carbon 12 to carbon 14 in dead material to the ratio when the organism was alive to estimate the date of its death.
(approximately 78% of atmospheric gases) by thermal neutrons which come from the powerful cosmic radiation, primarily generated by the sun.