radiochemical analysis (carbon dating) by: jeffrey skros
TRANSCRIPT
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Radiochemical Analysis
(Carbon Dating)
By: Jeffrey Skros
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What is it used for?
All bodies contain Carbon-14 Plants Oceans Animals Humans
Using the half life forensic scientists can detect when someone died or was born.
http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_gateway/radiation/radioisotopesrev5.shtmlhttp://ashleighrebeccakasie.weebly.com/lesson-7-food-cycles.html
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Is It Even Relevant?
OF COURSE! Used to identify remains
http://yekaterinburgnews.com/daily-news/yekaterinburg-cyclists-discover-skeletons-at-area-construction-site/10571/attachment/human-skull-on-a-black-background/http://www.faircitynews.com/2011/10/03/springfield-dentist-try-to-decide-what-to-do-with-3000-pulled-teeth/
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How Can It Be Used?
Nuclear testing done in the 1950s-1960s had left large amount of Carbon 14 in the Atmosphere
By studying the decay of the Carbon in human remains forensic scientists can determine the year of death or birth.
https://c14.arch.ox.ac.uk/embed.php?File=leaf_forensic.html http://www.radiocarbon.com/beta-radiocarbon-lab.htm https://sites.google.com/site/forensicsapap/ch-7-skeletal-system
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Testable Samples
Teeth
Blood
Hair
Nails
Bones
https://www.griffincenter.com/blog/2011/12/29/how-do-scientists-use-hair-in-crime-scene-investigations/http://www.kippaxhallsurgery.co.uk/tests-and-results.aspxhttp://www.radiocarbon.com/ams-dating-bones.htm
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LETS RECAP…
Based off of half life All humans have C-14 in them It’s a relatively new field Tests can be done on various human
remains
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FALSE No danger is present to those testing samples.
http://www.123rf.com/photo_9136416_no-nuclear-symbol.htmlhttp://www.forum.hr/showthread.php?t=730179&r=archive
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Difficulties and Interference
Preservation of Samples must be excellent
Small population can be tested
http://mombizcoach.com/time-focus-moneyhttp://www.clker.com/clipart-population-color-group.html
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Limitations and Precision
Small sample required for test
Fairly inaccurate Only works on humans born during or after
the nuclear testinghttp://en.wikipedia.org/wiki/Nevada_Test_Sitehttp://www.shutterstock.com/pic-55502602/stock-photo-many-bullet-holes-in-the-target-and-intact-bulls-eye-inaccuracy-concept.html
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Advantages Can be done with small sample
Doesn’t require any other information
Allows for testing of unidentifiable samples
Disadvantages Small population can be tested
Fairly inaccurate
Samples must be preserved
Will eventually be unusable
https://sites.google.com/site/forensicsapap/ch-7-skeletal-system
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Works Cited http://forensicoutreach.com/something-old-something-new-using-carbon-14-dating-to-age-recent-human-remains/
http://www.nij.gov/journals/269/pages/what-is-carbon-dating.aspx
http://www.radiocarbon.com/ams-dating-bones.htm
https://www.ncjrs.gov/pdffiles1/nij/237722.pdf
http://ashleighrebeccakasie.weebly.com/lesson-7-food-cycles.html
http://www.bbc.co.uk/schools/gcsebitesize/science/add_ocr_gateway/radiation/radioisotopesrev5.shtml
http://yekaterinburgnews.com/daily-news/yekaterinburg-cyclists-discover-skeletons-at-area-construction-site/10571/attachment/human-skull-on-a-black-background/
https://c14.arch.ox.ac.uk/embed.php?File=leaf_forensic.html
http://www.radiocarbon.com/beta-radiocarbon-lab.htm
https://sites.google.com/site/forensicsapap/ch-7-skeletal-system
https://www.griffincenter.com/blog/2011/12/29/how-do-scientists-use-hair-in-crime-scene-investigations/
http://www.kippaxhallsurgery.co.uk/tests-and-results.aspx
http://www.radiocarbon.com/ams-dating-bones.htm
http://www.123rf.com/photo_9136416_no-nuclear-symbol.html
http://www.forum.hr/showthread.php?t=730179&r=archive
http://mombizcoach.com/time-focus-money
http://www.clker.com/clipart-population-color-group.html
http://www.shutterstock.com/pic-55502602/stock-photo-many-bullet-holes-in-the-target-and-intact-bulls-eye-inaccuracy-concept.html
http://en.wikipedia.org/wiki/Nevada_Test_Site