出典:Wikipedia
出典:『Wikipedia』 (2011/07/19 15:51 UTC 版)
A radioactive tracer, also called a radioactive label, is a substance containing a radioisotope that is used to measure the speed of chemical processes and to track the movement of a substance through a natural system such as a cell or tissue. A number of different radioactive forms of hydrogen, carbon, phosphorus, sulfur, and iodine are commonly used in applications including biochemical assays, metabolism studies, and medical diagnostics.