Can you please state what measurements are taken to confirm the initial concentration... In my mind there are none, since no scientist lived at that time to take samples and test them, and record the iniital concentration... This can be said for any other radioactive isotope for all other radioactive dating... IF you cannot define what measurements are taken then we must conclude that it is an assumption.
Hi again gilbo12345
Well, as I said: "...any initial assumptions of the C14 method ... have since been confirmed from observational evidence as valid and correct within the limits of the scientific method." So of course you're correct that the scientific method is limited to measurements they can make today i.e. they don't have time machines.
Nevertheless, evolutionist scientists take the approach that, if assumption X about the past is true, we should be able to take measurement Y today, and if X is false, the measurement taken today will be something else. This is the sort of approach e.g. forensic scientists take as well, to test hypotheses about past events.
Following this logic, scientists have compared ages from C14 versus ages from numerous other methods. If the assumptions behind C14 dating are correct (atmospheric C14 concentrations, half-lives etc), then we would expect a good correlation between C14 ages and the other methods. And in fact, the correlation is very, very good. For this reason, scientists believe their assumptions are valid, within the limits of the scientific method:
Yes living things exchange carbon with the atmosphere, (which we get in turn from plants and animals), you suggesting are that the concentration levels are relatively the same throughout the biosphere? Just to let you know, this is an assumption and a very large one at that. How is this assumption justified?
C14 concentrations have been measured roughly the same all over the world since scientists began looking into this in the 50s. There certainly are variations - Wikipedia has more info on this here in the section "Carbon exchange reservoir".
All these other methods of dating are assuming that there is a constant rate... Yet this assumption is not logical...
Trees can form more than one ring in a year
Coral growth is dependant on the creature inside, which is dependant on its environment. Considering the state of the oceans today, I'd assume they are working slower than is normal.
Limestone caves are formed from water yes? So the rate of rainfall would determine the speed, how is this constant?
You're right, logic would not dictate that the rates of formation of independent things like coral, tree rings, limstone caves and sediment layers must necessarily be constant. Instead, the rate of formation is inferred from circumstantial evidence.
For example, coral growth rings are currently observed to occur daily and the reasons for this are understood on the basis of their physiology (ie. they produce their layers mostly during daylight). Similarly, some sediment layers are currently observed to alternate between an organic-rich layer in spring & summer, and an organic-poor layer in the colder seasons. When scientists find tens of thousands of such layers in the same pattern, they conclude that the lower layers were formed via the same process as the upper layers which they can directly observe in modern times i.e. that that a pair of organic-rich and organic-poor layers represents one year.
Here is another thought. If life is a continuation of atoms being used for different processes, which is linked to the claim that we are "space dust"... then in reality we should see no C14 at all since it is believed that all atoms were created via big bang and the age should start from there.... If these carbon atoms have existed for billions of years, (despite what form) then there should be no C14 left in the entire galaxy. Or do we assume that when a person eats food some of the carbon somehow turns into C14?
Again, I'm not an expert, but the evolutionist explanation is that the C14 isotope is being continually produced in the earth's upper atmosphere. Cosmic rays approaching the earth transform into neutrons, which interact with nitrogen, converting the nitrogen into carbon-14 plus a proton. The production of C14 in the upper atmosphere has apparently reached equilibrium with the decay of C14 (back into N), so the overall concentration of C14 remains roughly constant.
Kind regards - SeeJay