What materials can be used for radiocarbon dating

It is not uncommon for a cosmic ray to collide with an atom in the atmosphere, creating a secondary cosmic ray in the form of an energetic neutron, and for these energetic neutrons to collide with nitrogen atoms.When the neutron collides, a nitrogen-14 (seven protons, seven neutrons) atom turns into a carbon-14 atom (six protons, eight neutrons) and a hydrogen atom (one proton, zero neutrons).Carbon-14 is radioactive, with a half-life of about 5,700 years.For more information on cosmic rays and half-life, as well as the process of radioactive decay, see How Nuclear Radiation Works.The Texas coastline is a dynamic environment where sand can either be added or subtracted by currents and storm surges, and Mc Faddin Beach is a place where net erosion of sand has been taking place, flanked on either side by areas of net accretion.Despite this, it is clear that the artifacts are washing ashore from the Gulf, not eroding out from deposits behind the beach.

As these changes have occurred, organisms have evolved, and remnants of some have been preserved as fossils.

Mc Faddin Beach is a 32-kilometer long stretch of sandy beach in Jefferson County on the upper Texas Gulf coast, extending from High Island on the west to Sea Rim State Park on the east.

Sabine Pass and the Louisiana state line lie another 19 km farther to the east.

The ratio of normal carbon (carbon-12) to carbon-14 in the air and in all living things at any given time is nearly constant.

Maybe one in a trillion carbon atoms are carbon-14.

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Despite seeming like a relatively stable place, the Earth's surface has changed dramatically over the past 4.6 billion years.

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