what information is obtained from radioactive dating

what information is obtained from radioactive dating

What information is obtained from radioactive dating

what information is obtained from radioactive dating

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We now consider in more detail one of the problems with potassium-argon dating, namely, the branching ratio problem. Here is some relevant information that was e-mailed to me. There are some very serious objections to using the potassium-argon decay family as a radiometric clock.

what information is obtained from radioactive dating

The geochronologist considers the Ca40 of little practical use in radiometric dating since common calcium is such an abundant element and the radiogenic Ca40 has the same atomic mass as common calcium. Here the actual observed branching ratio is not used, but rather a small ratio is arbitrarily chosen in an effort to match dates obtained method with U-Th-Pb dates.

what information is obtained from radioactive dating

The branching ratio that is often used is 0. Thus we have another source of error for K-Ar dating. Back to top Thus there are a number of sources of error. We now consider whether they can explain the observed dates.

what information is obtained from radioactive dating

In general, what information is obtained from radioactive dating dates that are obtained by radiometric methods are in the hundreds of millions of years range. One can understand this by the fact that the clock did not get reset if one accepts the fact that the magma "looks" old, for whatever reason. That is, we can get both parent and daughter elements from the magma inherited into minerals that crystallize out of lava, making these minerals look old. Since the magma has old radiometric dates, depending on how much the clock gets reset, the crust can end up with a variety of younger dates just by partially inheriting the dates of the magma. Thus any method based on simple parent to daughter ratios such as Rb-Sr dating is bound to be unreliable, since there would have to be a lot of the daughter product in the magma already.

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And Harold Coffin's book Creation by Design lists a study showing that Rb-Sr dates are often inherited from the magma. Even the initial ratios of parent and daughter elements in the earth do not necessarily indicate an age as old as 4. Radioactive decay would what information is obtained from radioactive dating faster in this web page bodies of stars, which is where scientists assume the heavy elements formed.

Imagine a uranium nucleus forming by the fusion of smaller nucleii. At the moment of formation, as two nucleii collide, the uranium nucleus will be somewhat unstable, and thus very likely to decay into its daughter element. The same applies to all nucleii, implying that one could get the appearance of age quickly. Of course, the thermonuclear reactions in the star would also speed up radioactive decay. But isochrons might be able to account for pre-existing daughter elements. Furthermore, some elements in the earth are too abundant to be explained by radioactive decay in 4.

what information is obtained from radioactive dating

Some are too scarce such as helium. So it's not clear to me how one can be sure of the 4. Back to top In general, potassium-argon dates appear to be older the deeper one goes in the crust of the earth. We now consider possible explanations for this.]

What information is obtained from radioactive dating - were visited

S GAO News August 24, What GAO FoundDOD has taken some steps to gain efficiencies in its approach to contracting for certain types of foreign language support services and products, but its contracting approach for other types remains fragmented across multiple components, and DOD has not explored whether additional opportunities exist to gain efficiencies across this broader range of contracting activity. In , DOD sought to centralize and standardize contracting efforts for foreign language support by designating the Army as an executive agent to manage contracting in this area. In performing its responsibilities, the executive agent has focused its efforts solely on arranging for contracts to acquire translation and interpretation services for contingency operations because of the rapidly increasing requirements for these services. During the same time period, we found that multiple DOD components contracted independently for foreign language support outside of the executive agent's management. In some cases, DOD has gained efficiencies by centralizing contracting for certain foreign language support contracts under an executive agent, but DOD has not comprehensively assessed whether additional opportunities exist to gain efficiencies across a broader range of foreign language support contracts. Best practices for service acquisition suggest that DOD's acquisition approach should provide for an agency-wide view of service contract spending and promote collaboration to leverage buying power across multiple organizations.

What information is obtained from radioactive dating - god

Radioactive decay[ edit ] Example of a radioactive decay chain from lead Pb to lead Pb. The final decay product, lead Pb , is stable and can no longer undergo spontaneous radioactive decay. All ordinary matter is made up of combinations of chemical elements , each with its own atomic number , indicating the number of protons in the atomic nucleus. Additionally, elements may exist in different isotopes , with each isotope of an element differing in the number of neutrons in the nucleus. A particular isotope of a particular element is called a nuclide.

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