forastero
Posts: 458
Joined: Oct. 2011
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| Quote (JonF @ Dec. 05 2011,16:14) | | Quote (forastero @ Dec. 05 2011,16:36) | | Quote (Tracy P. Hamilton @ Dec. 04 2011,19:52) | | Quote (JohnW @ Dec. 04 2011,19:25) | There's no evidence that either can produce the effects you want , but let's suppose you can pin your hopes on cosmic rays and/or distance to the Sun affecting decay rates in the way you'd like:
How much life would survive if the cosmic-ray flux at the Earth's surface was 100,000 times higher?
How much life would survive if the Earth was 100,000 times, or even 100 times, closer to the sun?
Why did the radioisotope power plants on the Galileo and Cassini probes work as expected? |
I wonder if the nitwit knows that a manned mission to Mars is not feasible because the cosmic rays in space are extremely likely to cause cancer, down here not so much. |
Cancer Rates Rise and Fall with Cosmic Rays
http://www.universetoday.com/12253......ic-rays
...and its also common knowledge that cosmogenic radioisotope accumulate at at different rates in terrestrial time and space |
All irrelevent to radiometric dating.
Still waiting for some evidence that contamination is a problem. |
Do you ever wonder why mummies are hardly ever dated with 14C? They are worried about contamination.
Funny how you shout contamination when similar amounts of 14C is found in all the coal, uranium and dinosaur bones, etc.. which btw suggests that all eras formed quickly and the organisms found within them all lived at the same time.
Of course its relevant because in carbon dating, more cosmic rays mean more c14 production, which should mean more C14 entering the bodies of living things. More c14 at the time of death could in turn make samples appear younger but then surges are known to deplete C14 from biotic matter after death; thus making them appear older. Interestingly, tap water accounts for 80% of the cancer risks from radioisoptopes, which to me means that water is also a big time source of contamination in fossils. Even more well known is water leaching radioisotopes from rocks. 14C is also found throughout the earth’s soil and like most radioisotopes, it reacts with other radioisotopes. Heat, carbonates, acids, changes in the magnetic field, and other factors can affect the ratio of C12 to C14. Microbic decomposers are often found in prehistoric bones and thus can also contaminate samples.
The 12C to 14C ratio is trillion (some documents say two trillionths) to one is not constant today and rates are changing due to various sources of production as we speak. Nuclear weapons and the burning of fossil fuels have also altered this ratio. Thus, do we really know if prehistoric animals consumed the same ratio of 14C? Different plants and animals ingest, absorb, and excrete 12C and 14C differently as do different body parts. Plus, many animals go days without food and gorge themselves so there is no way to know how much radioactive daughter elements are actually in the sample at death. Moreover, carbon dating often allows only a small sample to be estimated taken so there is no way to know if the ratio correlates with the quantities of the whole sample.
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