Potassium dating definition
The geomagnetic polarity time scale was calibrated largely using K–Ar dating.
The translations of potassium-argon dating from English to other languages presented in this section have been obtained through automatic statistical translation; where the essential translation unit is the word «potassium-argon dating» in English.
Potassium—argon dating is based on the decay of the radioactive isotope of potassium, potassium40 (40K), to the relatively unreactive argon isotope 40Ar which is a gas.
The technique was developed in the 1960s and has been used largely ...
Potassium (K) is one of the most abundant elements in the Earth's crust (2.4% by mass).
One out of every 10,000 Potassium atoms is radioactive Potassium-40 (K-40).
These each have 19 protons and 21 neutrons in their nucleus.
K-Ar Decay Profile Clicking on the "Show Movie" button below will bring up an animation that illustrates how a K-Ar sample is processed and the calculations involved in arriving at a date.Potassium-Argon Dating Potassium-Argon dating is the only viable technique for dating very old archaeological materials.Geologists have used this method to date rocks as much as 4 billion years old.It is based on the fact that some of the radioactive isotope of Potassium, Potassium-40 (K-40) ,decays to the gas Argon as Argon-40 (Ar-40).By comparing the proportion of K-40 to Ar-40 in a sample of volcanic rock, and knowing the decay rate of K-40, the date that the rock formed can be determined.