Radioisotopes carbon 14 dating pathway wichita dating site
If half of the uranium has decayed, then the rock has an age of one half-life of uranium-235, or about 4.5 × 10 y.In another interesting example of radioactive dating, hydrogen-3 dating has been used to verify the stated vintages of some old fine wines.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.
However, therapeutic applications usually require much larger doses because their purpose is to preferentially kill diseased tissues.
For example, if a thyroid tumor were detected, a much larger infusion (thousands of rem, as opposed to a diagnostic dose of less than 40 rem) of iodine-131 could help destroy the tumor cells.
Similarly, radioactive strontium is used to not only detect but also ease the pain of bone cancers.
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.