A very small percentage of the carbon plants take in is radioactive C Potassium clearly has 21 neutrons. But even though he used two different dating methods, Swisher kept making the same startling find: This accounts for about 6. Present testing shows the amount of C in the atmosphere has been increasing since it was first measured in the 's.
It'll just float to the top.
Potassium-argon (K-Ar) dating
Carbon 14 is the radio-active version of carbon. Video transcript We know that an element is defined by the number of protons it has. So argon is right over here. See Nature, April 18,p. Radiocarbon Dating. Due to the long half-life of 40 Kthe technique is most applicable for dating minerals and rocks more thanyears old. Potassium-argon dating.