CARBON DATING The most common fossil dating techniques are radiometric dating techniques. Radiometric dating uses knowledge of the decay rates of unstable ( radioactive ) nuclei to determine, by comparison with the proportion of stable nuclei in a fossil sample, the date of the introduction of the radioactive material into the live organism, especially if the isotope was ingested while the organism was alive.
It remains a useful technique especially in materials lacking radioactive isotopes. Relative dating by biostratigraphy is the preferred method inpaleontology, and is in some respects more accurate
carbon-14
Just for knowing its origin
what are two radio active isotopes that are usful for dating rocks that are older than ten million years
precambrian
No, not all radioactive isotopes be used in radiometric dating. Some have very very short half lives and would entirely disappear before any useful period of time passed.
Carbon 14 is useful for dating organic remains less than 60-70,000 years old. It is not useful for fossils as the vast majority are much older than that.
No, radiometric dating can only be used on certain minerals that contain radioactive isotopes. These minerals include zircon, potassium feldspar, and biotite, among others. Not all minerals contain radioactive isotopes, so radiometric dating cannot be applied to all minerals.
in making machines
because they detect cancer .
On long term, the useful isotopes of plutonium are not renewable.
C-14 has 2 extra neutrons and is radioactive with a half life of about 5000 years, making it very useful for dating biological material.