Posted on 08/11/2003 8:57:56 AM PDT by fishtank
We are carnivores. You are returning to your normal state
Before Atkins, wasn't there a 'paleolithic diet', lotsa meat, roots, berries, no refined flour or sugar?
Chromatic aberration of starlight.
"Yet still it persists; still there are those who tell us that history has ended, that religion has no more need of scripture, society no more need of customary morals, humanity no more need of guidance, behavior no more need of restraints. Still ... it persists -- the Eternal Heresy!"
Dialogue of Galileo Galilei, Lyncean
Special Mathematician of the University of Pisa
And Philosopher and Chief Mathematician
of the Most Serene
Grand Duke of Tuscany
Where, in the meetings of four days, there is discussion
concerning the two
Chief Systems of the World,
Ptolemaic and Copernican,
Propounding inconclusively the philosophical and physical reasons
as much for one side as for the other.
Published in 1632 in Tuscany (due to the death of the Roman printer in 1630).
...if 40K, for example, underwent 400 Ma of decay during the Flood relative to a present half-life of 1250 Ma, then 14C would have undergone (400/1250)*5730 years = 1834 years of decay during the Flood.(Note: if you do the algebra, you'll find this implies 20% of all radionuclides disappeared during the Flood. The half-life terms cancel out.)
If you had a solid canopy of ice, with full integrity, it would function as a bubble would it not
Thanks for responding.
I have to note at this point that Galileo was very near done in by the Church for supposing that the Earth was round. Clearly, the Pope of that time ascribed to the most literal interpretation of the Word.
My belief is the Pope was not taking a literal enough interpretation at that time. He was clearly being influenced by the scientists of his time (other than Galileo).
The word is very clear regarding the earth not being flat.
Isa 40:22
22 It is he that sitteth upon the circle of the earth, and the inhabitants thereof are as grasshoppers; that stretcheth out the heavens as a curtain, and spreadeth them out as a tent to dwell.
See this post for a more exhaustive treatment of the scriptual reference to the earth.
You can also measure the size of certain astronomical objects with nothing more than a clock. Imagine a variable star with a circular nebula around it. At some point the star hiccups and emits more light than usual. However far away the star is from us (and it doesn't matter for this calculation, nor do we have to know how far it is), the increase in light will arrive at Earth to be observed at some point in time, call it T. Meanwhile, some of the light from the same flash will have left the star traveling perpendicular to our line of sight, eventually reach the ring nebula after an elapsed time of X (i.e., that's the amount of time it took the flash to travel from the star to the nebula), and then the light of the nebula suddenly being illuminated will travel to Earth and become visible to us at time T+X. Voila, we now know that the nebula is X multiplied by the speed of light in radius. QED.
Note that in order to get the correct answer we needed to know *nothing* but the elapsed time between our seeing the star brighten, and the time we saw the nebula brighten. Well, that and the speed of light. We didn't have to know how far they were from us, or how big we thought they were, or anything else.
Also note that now that we know for sure how big across the nebula is, we can directly calculate its distance from us by simple algebra given how big the nebula looks in a given telescope of a known magnification.
Ah, yes, the four adult food groups.
"I don't know" is not an explanation.
Don't misrepresent, please. They didn't say "I don't know" what's producing the readings, they said that contamination was producing it. For example:
Rather than deal with the issue of the nature of the 14 C intrinsic to the anthracite itself, the authors merely refer to it as contamination of the sample in situ, not [to be] discussed further.And:
This same approach of treating measurable and reproducible 14 C values in samples that ought to be 14 C dead, given their position in the geological record, as contamination is found throughout the current literature.The fact that you apparently don't agree with their explanation or you consider it inadequate doesn't change the fact that they do, indeed, have one. And it appears to be the correct one -- see my next post.
The primary researcher's tried and tried to eliminate the anomalous result. They failed. The result was. "I don't know".
No, they did numerous things which would likely eliminate *surface* contamination (from the original site as well as during transport/testing) and contamination of the testing equipment, and concluded that the readings were thus coming from contamination *in* the sample itself. That's not "failure", that's successful elimination of other factors. The result was not "I don't know", it was "we now think that the contamination is likely from within the sample and not from *external* contamination".
Any of your hypothetical explanations fails to account for the tests used by the primary researchers and described by the "non-reading" current authors.
Oh? How do you figure that? You forgot to "show your work".
Now you might note that Giem is cited from [18] Giem, P., Carbon-14 Content of Fossil Carbon, Origins, 51(2001) pp.6-30. and these are the primary researchers on the case I mentioned [30] Nadeau, M.-J., Grootes, P.M., Voelker, A., Bruhn, F., Duhr, A., and Oriwall, A., Carbonate 14C Background: Does It Have Multiple Personalities?, Radiocarbon, 43:2A(2001), pp. 169-176.. Giem does not cite them.
Yes, I "might" note that, since I was the one to point that out to you in my prior post:
That refers *only* to citation #30, and describes their inability to explain why C14 levels would be correlated with species. It's not a summation of all the "primary researchers" [i.e., the dozen-plus cited by Giem].Is there any special reason you're repeating it back to me?
Finally, despite your aspersions, Uranium is not as ubiquitous as Nitrogen.
Red herring alert. Not only did I not claim that it was, but that's irrelevant to the point I made. I would be highly interested to hear why you thought it was.
What is relevant, however, is that Uranium is more ubiquitous than Carbon-14. The human body, for example, contains about a thousand times as many Uranium atoms as Carbon-14 atoms, and in long-dead organisms the disparity is even greater. Carbon-14 is present in only trace amounts even at the best of times (it comprises only 0.0000000002% of the Carbon in living tissue). It doesn't take much C-14 from other sources (internal or external) to contaminate things.
Furthermore, Carbon-14 can be produced in situ by muon capture by Oxygen nuclei -- and needless to say organic material has a lot of Oxygen. See for example In situ produced 14 C by cosmic ray muons in ablating Antarctic ice. Additional measurable C-14 was produced at depths of over 40 meters.
The authors of the PDF failed to examine either of these possible sources of de novo Carbon-14, among others, as well as the possibility that there may be others sources which we just haven't learned about yet (note that Ac-225's alternate decay mode into Carbon-14 was only discovered in 1993, for example).
However, it seems that the real explanation is simple surface contamination after all. See my next post.
First, a quick recap of what the "too much Carbon-14" measurements may mean (bear with me please):
1. Systematic error in the testing equipment or methods.
2. External contamination.
3. Internal contamination (i.e., new Carbon-14 being produced within the sample in some manner).
4. All organic samples really *are* no older than 40,000 years.
5. Decay rates have varied in the past.
6. Bad data, dishonest reporting, sloppy technique, fabricated results, etc.
7. Some combination thereof, including the original authors' overburdened combo of "they indicate a max of 40,000 years because a) nothing died earlier than that *and* b) they're even much younger than those careful 40,000-year measurements indicate by an order of magnitude because *also* c) decay rates have changed drastically from time to time *and* d) so have production rates". Uh huh...
From the original article in this thread:
#1 seems ruled out by the repeatability of the results for different samples, and the fact that some samples measure just fine at "damned little C-14" as expected. Although it would still be possible that something about the testing methods may produce spurious results only when applied to samples with certain compositions, but that's unlikely.
#2 seems ruled out by the many methods which were used to try to "wash away" external contaminants.
#3 seems possible, and that's the direction I was leaning, but some quick back-of-the-envelope calculations led me to think that they might not be able to account for as much C-14 as was measured (although I'm hardly a nuclear physicist, and may have overlooked some possibilities).
#4 is incredibly implausible on its face, for reasons I've given earlier -- there are just *too* many other lines of evidence that firmly indicate that the Earth really is quite old.
#5 is highly unlikely, *no* evidence has been found that decay rates have ever fluctuated while we've been monitoring them, nor that they ever have in the past (since that would have left tell-tale signs).
#6 is tempting, but... Other than the fact that I think it's pretty sloppy to try to compare readings from multiple researchers across multiple labs across multiple years (since their techniques and precisions and equipment are all likely to vary), I'm willing to give the authors and the researchers they cite the benefit of the doubt.
#7 is... Imaginative, but unlikely cubed. Not only does it postulate *multiple* outlandish deviations from established principles of science just to "reconcile" one anomalous finding, but it flies in the face of innumerable other findings which are much better supported *and* its proposed solution would have caused countless other noticeable effects (like, say, a million-fold increase in natural radiation which would have flash-fried Noah) which simply are not the case.
So since we seem to have eliminated -- or at least cast strong doubt on -- all possibilities, what the heck *is* the explanation for the results?
I can't resist a good puzzle, so I've been researching this question off and on all day. I've learned a lot of interesting things in the process (and expanded my IE bookmarks even further), but I think I hit paydirt when I came across the following:
Oh look, someone's broken the "radiocarbon barrier". And the fact that they did it with a new method for removing external contaminants seems pretty convincing evidence that the "radiocarbon barrier" was due to, well, external contaminants. Looks like those prior researchers weren't off-base after all (the ones that the authors of the PDF sneered at for attributing the results to contaminants).Abstract
New dating confirms that people occupied the Australian continent before the earliest time inferred from conventional radiocarbon analysis. Many of the new ages were obtained by accelerator mass spectrometry 14C dating after an acidbaseacid pretreatment with bulk combustion (ABA-BC) or after a newly developed acidbasewet oxidation pretreatment with stepped combustion (ABOX-SC). The samples (charcoal) came from the earliest occupation levels of the Devil's Lair site in southwestern Western Australia. Initial occupation of this site was previously dated 35,000 14C yr B.P. Whereas the ABA-BC ages are indistinguishable from background beyond 42,000 14C yr B.P., the ABOX-SC ages are in stratigraphic order to ~55,000 14C yr B.P. The ABOX-SC chronology suggests that people were in the area by 48,000 cal yr B.P. Optically stimulated luminescence (OSL), electron spin resonance (ESR) ages, U-series dating of flowstones, and 14C dating of emu eggshell carbonate are in agreement with the ABOX-SC 14C chronology. These results, based on four independent techniques, reinforce arguments for early colonization of the Australian continent.
-- From Early Human Occupation at Devil's Lair, Southwestern Australia 50,000 Years Ago (published online 11 March 2002)
Note the interesting parts of the abstract, which I've highlighted in color.
The green portion notes that this is a new technique for removing contaminants.
The red portion is key -- it notes that although older pretreatments for eliminating contaminants still showed the 40,000-year-old "radiocarbon barrier", the new technique allowed readings way beyond 40kya -- up to 55,000 years. Furthermore, in a NERC grant, one of the authors was granted 19,627 British pounds to develop a facility to apply the technique in greater volume, with claimed ability to read dates up to 60,000 years.
Furthermore, the technique is shown to not just produce higher numbers by some means, but to do them accurately, as matched against the results of four other independent dating methods (blue text).
So to summarize:
1. The PDF authors concluded that the "radiocarbon barrier" was due to some real feature of the specimens (i.e., they all really did die "recently") and pooh-poohed the notion that it was due to contaminants. However, the fact that a particular technique can make specimens read older than the proposed "barrier" *and* match the results of other independent dating methods pretty much blows that one out of the water.
2. The fact that a contaminant-removing method has succeeded in overcoming the "barrier" indicates that the barrier was indeed caused by contaminants.
3. The fact that the dates "uncovered" by the method make sense (i.e. are consistent with the origin of the specimens and their relationship to each other and to younger specimens) and match four independent dating methods very strongly indicates that the findings are "real" and not artifacts of the processing method.
4. The new higher results can't be the result of "washing out" too much of the original Carbon-14 -- C-14 dating is done by measuring the ratio of C-14 to C-12 within the sample, and this will remain constant despite vigorous "washing" because any cleaning method is going to remove proportionately equal amounts of C-14 and C-12 because they are chemically identical.
5. At its upper limits, contamination will always be a problem for techniques like C-14 dating which rely on measuring the amount of very trace amounts of material. Even at the best of times (i.e., before an organism's death) Carbon-14 only makes up 0.0000000002% (not a typo) of the Carbon in the organism. *Very* small amounts of additional C-14 will contribute a significant amount of "noise" to the measurements of the smaller amounts of C-14 present in an old sample. This is not an indictment of C-14 dating in general, though, since such contamination has a far smaller effect on the relatively larger amounts of original C-14 being measured in younger samples. It's only when stretching the technique to its upper end that contamination "noise" becomes almost as large (or larger) than the true amount you're attempting to measure. Previously, the best techniques would still leave enough contamination to swamp a 40,000+ year reading. With the new more effective ABOX-SC technique, the noise level has been pushed back to 60,000 years -- but it's still there. The authors of the PDF would have you believe that this is because there's always measurable amounts of "original" C-14 in all samples. But this does not follow. The much more mundane (and likely) explanation is that there will always be an unavoidable amount of modern C-14 creeping into everything, like the way that sand on a beach always gets into your socks and shorts no matter how you try to avoid it.
6. This is the sort of thing which would have been caught by peer-review publishing. That's one of the many reasons why it's valuable.
7. In reference [12] the PDF authors cite an earlier work by some of the same authors as the article I abstracted above, and their overview of it sounds rather like ABOX-SC, or an earlier version of it -- and yet they did not point out the breaking of the 40,000kya radiocarbon barrier. Call me suspicious, but I'm going to track down a copy of that earlier work and see whether the PDF authors glossed over its implications or presented it misleadingly (although it's possible that the earlier work had not yet achieved the above success). I'll report back after I do that.
I thought it was the idea that the Earth revolved around the Sun, instead of the other way, that got him in trouble.
You win...... for having the LARGEST 'home page' on FR that I've ever seen!
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