etiquette in dating for teenager - Radioisotopes as tracers in carbon dating
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.
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One isotope, carbon-14, is particularly useful in determining the age of once-living artifacts.
A tiny amount of carbon-14 is produced naturally in the upper reaches of the atmosphere, and living things incorporate some of it into their tissues, building up to a constant, albeit very low, level.
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.
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.
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 fibers, 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.
Radioactive isotopes have a variety of applications.
Generally, however, they are useful because either we can detect their radioactivity or we can use the energy they release.
We know these steps because researchers followed the progress of carbon-14 throughout the process.Tags: Adult Dating, affair dating, sex dating