A fossil can be studied to determine what kind of organism it represents, how the organism lived, and how it was preserved.
However, by itself a fossil has little meaning unless it is placed within some context.
Five Nobel Laureates have been intimately involved with the use of radioactive tracers in medicine.
Over 10,000 hospitals worldwide use radioisotopes in medicine, and about 90% of the procedures are for diagnosis.
Atomic Number: 6 Atomic Weight: 12.0107 Melting Point: 3823 K (3550°C or 6422°F) Boiling Point: 4098 K (3825°C or 6917°F) Density: 2.2670 grams per cubic centimeter Phase at Room Temperature: Solid Element Classification: Non-metal Period Number: 2 Group Number: 14 Group Name: none What's in a name? Three naturally occurring allotropes of carbon are known to exist: amorphous, graphite and diamond.
Carbon is most commonly obtained from coal deposits, although it usually must be processed into a form suitable for commercial use.
For example, based on the primate fossil record, scientists know that living primates evolved from fossil primates and that this evolutionary history took tens of millions of years.
By comparing fossils of different primate species, scientists can examine how features changed and how primates evolved through time.
It can also be pressed into shapes and is used to form the cores of most dry cell batteries, among other things.
The most common radioisotope used in diagnosis is technetium-99, with some 35 million procedures per year (16.7 million in USA in 2012, 550,000 in Australia), accounting for about 80% of all nuclear medicine procedures worldwide.
In developed countries (26% of world population) the frequency of diagnostic nuclear medicine is 1.9% per year, and the frequency of therapy with radioisotopes is about one tenth of this.
History and Uses: Carbon, the sixth most abundant element in the universe, has been known since ancient times.
Amorphous carbon is formed when a material containing carbon is burned without enough oxygen for it to burn completely.