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![](https://webarchive.library.unt.edu/eot2008/20081107014634im_/http://www.nsf.gov/images/x.gif)
![](https://webarchive.library.unt.edu/eot2008/20081107014634im_/http://www.nsf.gov/images/x.gif) Press Release 05-099 Trace Gold Reveals Tree's Past
![](https://webarchive.library.unt.edu/eot2008/20081107014634im_/http://www.nsf.gov/images/greenlineshort.jpg)
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![A sample has been removed from this tree slice to examine it for traces of gold.](https://webarchive.library.unt.edu/eot2008/20081107014634im_/http://www.nsf.gov/news/mmg/media/images/unlu1a2_f.jpg) |
A sample has been removed from this tree slice to examine it for traces of gold.
Credit: Greg Grieco, Pennsylvania State University |
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![Ring samples are analyzed by neutron activation.](https://webarchive.library.unt.edu/eot2008/20081107014634im_/http://www.nsf.gov/news/mmg/media/images/unlu2a2_f.jpg) |
Ring samples are analyzed by neutron activation.
Credit: Greg Grieco, Pennsylvania State University |
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![Vials filled with samples are ready for analysis.](https://webarchive.library.unt.edu/eot2008/20081107014634im_/http://www.nsf.gov/news/mmg/media/images/unlu3a2_f.jpg) |
Vials filled with samples are ready for analysis.
Credit: Greg Grieco, Pennsylvania State University |
Download the high-resolution JPG version of the image. (573 KB)
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