Application of isotopes in carbon dating
Application of isotopes in carbon dating - 100 free webcams free no sign up
After incorporating radioactive atoms into reactant molecules, scientists can track where the atoms go by following their radioactivity.One excellent example of this is the use of carbon-14 to determine the steps involved in photosynthesis in plants.
(The half-life of carbon-14 is 5,370 y.) If a once-living artifact is discovered and analyzed many years after its death and the remaining carbon-14 is compared to the known constant level, an approximate age of the artifact can be determined.Shroud of Turin In 1989, several groups of scientists used carbon-14 dating to demonstrate that the Shroud of Turin was only 600–700 y.Many people still cling to a different notion, despite the scientific evidence.The thyroid gland in the neck is one of the few places in the body with a significant concentration of iodine.To evaluate thyroid activity, a measured dose of I is administered to a patient, and the next day a scanner is used to measure the amount of radioactivity in the thyroid gland.Technetium-99 can also be used to test thyroid function.
Bones, the heart, the brain, the liver, the lungs, and many other organs can be imaged in similar ways by using the appropriate radioactive isotope.
C-14 is another radioactive isotope that decays to C-12. Because of its short half-life, the number of C-14 isotopes in a sample is negligible after about 50,000 years, making it impossible to use for dating older samples.
The half-life of C-14, however, is only 5,730 years.
Using such methods, scientists determined that the age of the Shroud of Turin (Figure 15.3 “Shroud of Turin”; purported by some to be the burial cloth of Jesus Christ and composed of flax fibres, a type of plant) is about 600–700 y, not 2,000 y as claimed by some.
Scientists were also able to use radiocarbon dating to show that the age of a mummified body found in the ice of the Alps was 5,300 y.
Contrary to the belief of some people, irradiation of food Radioactive isotopes have numerous medical applications—diagnosing and treating illness and diseases.