In our modern world, high energy radiation from outer space bombards nitrogen, gives it extra energy, breaks it up and produces radioactive carbon 14 as a result.
This means absorption of radioactive carbon by living things has not been the same throughout history, which means Carbon 14 decay dating methods cannot be relied on for accurate dates.
For a creation perspective on dinosaurs see the Creation Research DVDs: Jehovah’s Park: The monsters God made, and Dinosaurs: The rest of the tail These available from the Creation Research webshop. If so, consider making a donation so we can keep adding more answers.
So when you set your newly invented C14 Clock, as Willard Libby did when he developed the method, it has to have a known rate of decay that can be measured against known historical time lapses, e.g..
the Birth of Christ, the reign of Julius Caesar, etc.
However, the world ceased to be very good after Adam and Eve rebelled against God and God cursed the ground in judgement.