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Dating - the Radiocarbon Way

293 ratings | 33171 views
Christine Prior explains the process of radiocarbon dating at GNS Science, New Zealand.
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Text Comments (55)
Dayal Samanpriya (15 days ago)
thank you! nice explane
Vasu Chappa (1 month ago)
She's beautiful .
REKHRAM DHRUW (2 months ago)
all just imagination
Leoneys Symon (2 months ago)
What is a decay?
The global man (3 months ago)
Thank you very much
Bharat TheJaiswal (4 months ago)
Great, only video on youtube which satiates my curiosity. Thanx.
Lobselvith_Black (6 months ago)
@GNS Science thanks for the video, I was wondering if you know any info about how the scientist that invented Radiocarbon dating found this form of dating? and what dating technique was used before its invention? thanks again.
F L I T Z (9 months ago)
More reliable than the bible.
DCBadeZiR. (10 months ago)
The best Machine operators i ever seen... As i understand Science keeps guessing everything and selling as a Fact with their wonderful machines...
Archana Jn (10 months ago)
Thanks for the video
Aynal Haque Milon (11 months ago)
Lewis Maker (1 year ago)
Quite a bit of work to do on one sample. I found some bone fragments and one was a piece of jaw that had some teeth still there. My dentist said that it was of a small woman who had to have chewed a lot of hide to soften it up as the molars were really worn down. I reburied them in a safer place next to where I had found them. But recently I found a fragment from her joint that I missed. So I wonder how old are her bones? So how much would you charge me to satisfy my quiorisity?
jujuflyer (10 months ago)
Hi there, Here is where you can find information about getting a sample measured: https://www.gns.cri.nz/Home/Services/Laboratories-Facilities/Rafter-Radiocarbon-Laboratory Cheers
Calender calibration what from 365 day to a 364 day year at Bce?
Victor Soliman (1 year ago)
Why the team leader entered the lab without coat and safety glasses.
Victor Soliman it’s an accelerator not a reaction laboratory
John Smith (1 year ago)
Piece of cake
The ParaXposer (4 months ago)
larry shulman (1 year ago)
great video
Joe (1 year ago)
Can someone explain the term half life? it doesn't mean half the life of the object, correct?
Leoneys Symon (2 months ago)
Is the amount of time taken of the activity of the radioactivite substance reduces to half
mohamed sallak (1 year ago)
First half life when 50% of all C14 decayed to N14... second half life when half the remaining 50% of C14 has decayed.... an so on
Moe Ahmad21 (2 years ago)
Great video, however, I thought that to determine the radiocarbon age you would compare the ratio of C-12 to C-14. Not C-14 to C-13 like you said. Or does it not matter because C-12 and C-13 are both constant?? @GNS Science
abxx (2 years ago)
The best video I found on this topic.
GNS Science (2 years ago)
TheGarfieldPrototype (2 years ago)
Thanks for the informative video!
Vishva Kumara (2 years ago)
If you are to wash it with "organic" solvents, wouldn't it be more contaminated with newer carbon..?
Allan Edson (2 years ago)
awesome explanation
John Christian (3 years ago)
How do you know how much C14 "should have" been in a sample thousands of years ago when the atmosphere & oxygen levels could have been very different to today? There seems to be a lot of wide ranges, doesn't sound like the most accurate science at all.
Dr Dimento (6 months ago)
Exactly. In order to create a calibration curve, one has to have a standard of known value with which to calibrate the curve. This standard has to be one that is close to the expected analysis of the sample itself, since all curves have nL and thus are not accurate beyond a specific range on the curve. Spectrometry is quite specific in the way the curves are built, analyzed and standardized. Where did they get a known sample from anything before the test was invented and thus designed? (for anyone who doesn't know, the answer is the 1950's; the same time that the Bible was under heavy dark scrutiny for undermining educators who wanted to reduce learning from factual scientific details to philosophical details in order to change the course of society to speculative instead of moral solid absolutes). As one professor stated it so avidly stated it, "we have determined that there are ABSOLUTELY . . no ABSOLUTES !" I'll repeat that in case you didn't get it, "...there are ABSOLUTELY . . no ABSOLUTES !"
Dr Dimento (6 months ago)
NOTE she did not go into the contaminate discussion, just that it was there. Every found any fossils where there wasn't some form of contamination, at the very least bacteria. These cannot be washed out with any accuracy, therefore at collection and analysis the sample is already contaminated and cannot be filtered out. Moreover, when the sample is being placed in the test tube to be vacuumed, not that heat is applied. The head of course will oxidize both C14 and C12 and thus the sample is being contaminated by the very nature of the test itself.
Dr Dimento (6 months ago)
EXACTLY !! The possibility of contamination, and thus error, exists in at least 14 locations that I counted on just a single pass watch through and I'm sure that I made "errors" in missing one or two or more. Moreover, there are were a lot of "assumptions" and estimates (or guesses) plugged into the discussion. In addition, at the very end during the curve illustration the possible error from the dynamic middle was what percent of variation? Way more than the +/- 25 years shown in the analysis report. Carbon dating is merely a chemical analysis test devised by man to make him think he's smarter than the atmosphere. In measuring C14 and C12 there is one major assumption, the C14 that was present in the animal when it was alive. That number for a dinosaur would be what? We don't know. We have never discovered a live one at the time it died; thus we don't know what its' C14 was, only what it is now. There is so much more that I could go on for days. But I won't.
John Cho (1 year ago)
Circular logic exists between radiocarbon dating and dendrochronology.
Robert Pelletier (1 year ago)
I was wondering where that calibaration curve came from, thanks
Mr. President (4 years ago)
what a nice explaination!!
Dr. Good Heart (4 years ago)
Radioactive Carbon 14 From Nuclear Power Plants Causing Deforestation, Disease And Death Of Plants and Trees Globally; via @AGreenRoad http://agreenroad.blogspot.com/2014/05/carbon-14-emitted-by-nuclear-power.html
jeveuxlesoleil (5 years ago)
So your analogy is flawed. The decay is a half life, not a whole life; a better analogy is you have 1 cookie and each day you take half of what you had the day before. 2nd day would have half a cookie, then a quarter, then eighth etc but if you were able to split those halves on an atomic level you could do so forever.
jeveuxlesoleil (5 years ago)
We don't find C14 in machine blanks. To date things older than 100kybp we generally use K-Ar dating not C-14 due to the differential rate of decay… the half life of K is substantially longer. That said the decay is a logarithm and therefore a function of an exponent (x=log10(A0/An)/log10(2)) and therefore you will never truly have a sample with no C14 (divide 1/2, then .5/2, then .25/2 etc). You will however have a sample with so little C14 that it cannot be measured.
islandonlinenews (5 years ago)
looks to me like most of the time they would try to give the client what they are looking for.
GSpotter63 (5 years ago)
Part 1) If I give you a cookie jar with 100 cookies in it and I take out one cookie a day, and you then look in the jar on day 10, you would find 90 cookies in the jar. On day 99 there would be one cookie in the jar. On day 101 + there may be NO cookies in the jar. The bottom line is, if the half life of c14 is 5730 years +- 16, then by 174.52 half lives or 1,000,000 years there would be NO c14 left in the sample to detect. How can there be any error if there is nothing to detect?
GSpotter63 (5 years ago)
Part 2) The very fact that any c14 at all is found even in the samples or "machine blanks" that are supposedly millions of years old is an indication that something is not right with the measuring system. Either the measuring system is flawed or the samples as well as the machine blanks are not millions of years old.
GSpotter63 (5 years ago)
The 3 isotopes c12, c13, and c14 can be separated by magnetic deflection due to their difference in mass and then sent to different detectors for counting and to calculate the ratios. Why is it that a sample with exceedingly few c14 atoms ( like in the case of a sample that is believed to be 100 million + years old) cannot be counted?
raees rana (5 years ago)
stevecytfme (6 years ago)
I found this extremely fascinating and informative. I really wish I had studied more in school and perhaps went into chemistry. Oh life is full of regrets unfortunately. If I had only done this, if I had only done that. Man I wish my life had gone differently. I wish I had made better choices when I was young. I know I could have done better if I had just applied myself. Pay attention all you slackers!!
MumblingMickey (6 years ago)
Thres something up with your PC or tablet... fine on my laptop, fine on my desktop, fine on my phone and fine on my ipad... those are the only devices in my living room... but If I were you I'd download new drivers for my pc sound card....
Lady Onikara (6 years ago)
One thing to dislike is the audio quality. I can't even hear the stupid thing. Computer is all the way up on sound too.
y3llowdog (7 years ago)
My professor recommended this video, Oregon State all the way.
Vrej Egon Spengler (7 years ago)
@MumblingMickey I'm seeing 8 likes, 0 dislikes
MumblingMickey (7 years ago)
8 people 'disliked' this vid? what sort of 'dislike' could one have?...its just a woman showing how to measure separate quantities of carbon c13 to c14 in someones textiles they might buy? what is there to to dislike here? they don';t like the woman? they don't like carbon? wtf? some people are just weird...
Vrej Egon Spengler (7 years ago)
Is that an ordinary thermos? By ordinary, I mean the ones you can buy at stores, that are double walled glass with some reduced pressure between the walls.

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