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As far as stars are concerned, the Th/Nd ratio has been shown to be unchanged no matter what the age of the star is, which leads one to two conclusions.Firstly, supernovae have not added a significant amount of new elements to putative star-forming clouds.Furthermore, there is evidence that the main radioactive elements were concentrated in a layer low in the mantle and came to the surface progressively after that.I emailed you about this topic a year or two ago, and I've since taken a class in radioisotope chemistry at UCI.Each chapter will include a few questions designed to test your knowledge of material covered in the chapter and in the Internet-based resources.

Interestingly, using these sorts of ratios, one piece of moon rock dated as being 8.2 billion years old, to the amazement of the dating laboratory involved.

Given that point, it seems that the stars must be basically the same age.



Radiometric dating Answer the following questions. 1unstable isotope would be best to refine the date of bones found in a cave hearth built by humans between 20,000 and 40,000 years ago? 2. Argue with the following statement A stone tool fashioned from a chunk of obsidian yields a date of 3,000,000 years old.… continue reading »


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Each chapter will include a few questions designed to test your knowledge of material covered in the chapter and in the Internet-based resources. Your answers are not being recorded. Try the following. Atoms of AA decay to atoms of BB with a half-life of 100,000 years. If there are 20,000 atoms of AA to begin with and 0.… continue reading »


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Scientists combine several well-tested techniques to find out the ages of fossils. The most important are Relative Dating, in which fossils and layers of rock are placed in order from older to younger, and Radiometric Dating, which allows the actual ages of certain types of rock to be calculated. Relative Dating. Fossils are.… continue reading »


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Feb 24, 2012. How scientists can use radioactive decay to find the age of certain materials. Radiometric dating is the process of using the concentrations of radioactive substances and daughter products to estimate the age of a material. Different isotopes are used. Use this resource to answer the questions that follow.… continue reading »


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Apr 8, 2017. The most well-known of all the radiometric dating methods is radiocarbon dating. Although many people think radiocarbon is used to date rocks, it is limited to dating things that contain carbon and were once alive fossils. How Radiocarbon Forms. Radiocarbon carbon-14 or 14C forms continually today in.… continue reading »


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Apr 24, 2017. Let's take a closer look at the radioactive dating method and the radiometric dating methods and see how reliable they really are.… continue reading »


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