Thousands...Not Billions by Don DeYoung

Author:Don DeYoung [DeYoung, Don]
Language: eng
Format: epub
Tags: RELIGION / Religion & Science
ISBN: 9781614580997
Publisher: Master Books
Published: 2005-08-30T16:00:00+00:00

Table 6-1. (Right) Fission track age results for 12 tuff samples from the Grand Canyon-Colorado Plateau region. The number of grains in parenthesis show how many separate zircons were analyzed for fission tracks for each tuff sample. The previously published ages and RATE age results are all in millions of years, or Ma. The references are given in the technical RATE volumes (Vardiman et al., 2000, 2005).

The fission track dating of the RATE samples was contracted out to a commercial laboratory with world-class expertise in fission track analysis. GeoTrack International Laboratory, located in Melbourne, Australia, was selected for the work. There are many steps to the process. Samples are crushed, and then the zircon crystals are extracted, ground, polished, and etched. After counting the original fission tracks, neutron irradiation of the sample induces additional tracks. Each of these steps is carried out in an environment carefully monitored for contamination. Figure 6-1 is a photograph of uranium-238 fission tracks in grains of zircon. These tracks are from a RATE sample analyzed by GeoTrack International.

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