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In the case of daughter excess, a larger amount of the daughter is initially deposited than the parent. Non uranium daughters such as protactinium and thorium are insoluble, and precipitate out on the bottoms of bodies of water, forming daughter excesses in these sediments. Over time, the excess daughter disappears as it is converted back into the parent, and by measuring the extent to which this has occurred, scientists can date the sample.
If the radioactive daughter is an isotope of uranium, it will dissolve in water, but to a different extent than the parent; the two are said to have different solubilities.
For example, u dissolves more readily in water than its parent, u, so lakes and oceans contain an excess of this daughter isotope. This excess is transferred to organisms such as mollusks or corals, and is the basis of u u dating.
Some volcanic minerals and glasses, such as obsidian contain uranium over time, these substances become scratched. The marks, called tracks, are the damage caused by the fission splitting of the uranium atoms. When an atom of u splits, two daughter atoms rocket away from each other, leaving in their wake tracks in the material in which they are embedded. The rate at which this process occurs is proportional to the decay rate of the decay rate is measured in terms of the half life of the element, or the time it takes for half of the element to split into its daughter atoms.
When the mineral or glass is heated, the tracks are erased in much the same way cut marks fade away from hard candy that is heated. This process sets the fission track clock to zero, and the number of tracks that then form are a measure of the amount of time that has passed since the heating event. Scientists are able to count the tracks in the sample with the aid of a powerful microscope.
The sample must contain enough u to create enough tracks to be counted, but not contain too much of the isotope, or there will be a jumble of tracks that cannot be distinguished for counting. One of the advantages of fission track dating is that it has an enormous dating range. Objects heated only a few decades ago.
Be dated if they contain relatively high levels of conversely, some meteorites have been dated to over a billion years old with this method. Although certain dating techniques are accurate only within certain age ranges, whenever possible, scientists attempt to use multiple methods to date specimens.
Correlation of dates via different dating methods provides a highest degree of confidence in dating. See also evolution, evidence of; fossil record; fossils and fossilization; geologic time; historical geology.
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