radiometric dating techniques available to anthropologists quizlet

Radiometric dating techniques available to anthropologists quizlet

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Radiometric Dating | Answers in Genesis

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The nucleus contains protons (tiny particles each with a single positive electric charge) and neutrons (particles without any electric charge). Orbiting around the nucleus are electrons (tiny particles each with a single negative electric charge).

  The last 5 radiometric systems listed up in Table I have far shorter half-lives than all the rest. Unlike the radioactive isotopes discussed above, these isotopes are constantly being replenished in small amounts in one of two ways. The bottom two entries, uranium-234 and thorium-230, are replenished as the long-lived uranium-238 atoms decay. These will be discussed in the next section. The other three, Carbon-14, beryllium-10, and chlorine-36 are produced by cosmic rays--high energy particles and photons in space--as they hit the Earth's upper atmosphere. Very small amounts of each of these isotopes are present in the air we breathe and the water we drink. As a result, living things, both plants and animals, ingest very small amounts of carbon-14, and lake and sea sediments take up small amounts of beryllium-10 and chlorine-36.


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