K-Ar Dating Half Life

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K-Ar dating - Wikipedia
Potassium-Argon Dating Methods: K-Ar and Ar-Ar Dating
(K/Ar) Potassium Argon Dating Techniques I
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Due to the long half-life of 40 K , the technique is most applicable for dating minerals and rocks more than 100,000 years old . For shorter timescales, it is unlikely that enough 40 Ar will have had time to accumulate in order to be accurately measurable . K-Ar dating was instrumental in the development of the geomagnetic polarity time scale .
Potassium-40 decays with a half-life of 1250 million years, meaning that half of the 40 K atoms are gone after that span of time . Its decay yields argon-40 and calcium-40 in a ratio of 11 to 89 . The K-Ar method works by counting these radiogenic 40 Ar atoms trapped inside minerals .
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K 40 has a half-life of 1 .26 billion years, but when it breaks down, there are three possible ways that it can degrade . If a K 40 atom degrades by beta decay then a Calcium 40 atom is produced . However, if the degradation is by either electron capture or positron decay, then Argon 40 is produced .
For example, with potassium-argon dating , we can tell the age of materials that contain potassium because we know that potassium-40 decays into argon-40 with a half-life of 1 . With rubidium-strontium dating , we see that rubidium-87 decays into strontium-87 with a half-life of 50 billion years .
So the good thing about that, as opposed to something like carbon-14, it can be used to date really, really, really old things . And every 1 .25 billion years-- let me write it like this, that's its half-life -- so 50% of any given sample will have decayed . And 11% will have decayed into argon-40 . So argon is right over here . It has 18 protons .
in the last video we gave a bit of an overview of potassium-argon dating in this video I want to go through a concrete example it'll get a little bit Matthew usually involving a little bit of algebra or a little bit of exponential decay but to really show you how you can actually figure out the age of some volcanic rock using this technique using a little bit of mathematics so we know that anything that is experiencing radioactive decay it's experiencing exponential decay and we know that we . . .
Each half-life is 1 .3 billion years, so after 3 .9 billion years (three half -lives) 12 .5% of the original 40K will remain . The red-blue bars represent 40K and the green-yellow bars represent 40Ar . [SE] In order to use the K-Ar dating technique, we need to have an igneous or metamorphic rock that includes a potassium-bearing mineral .
Argon-argon (or 40 Ar / 39 Ar ) dating is a radiometric dating method invented to supersede potassium-argon ( K/Ar ) dating in accuracy . The older method required splitting samples into two for separate potassium and argon measurements, while the newer method requires only one rock fragment or mineral grain and uses a single measurement of argon isotopes .
K-Ar Dating . 40 K is the radioactive isotope of K , and makes up 0 .119% of natural K . Since K is one of the 10 most abundant elements in the Earth's crust, the decay of 40 K is important in dating rocks . 40 K decays in two ways: 40 K → 40 Ca by β decay . 89% of follows this branch .
Potassium-argon dating , method of determining the time of origin of rocks by measuring the ratio of radioactive argon to radioactive potassium in the rock . This dating method is based upon the decay of radioactive potassium-40 to radioactive argon-40 in minerals and rocks; potassium-40 also decays to calcium-40 . Thus, the ratio of argon-40 and potassium-40 and radiogenic calcium-40 to . . .
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K-Ar Dating Half Life