In this case, however, it would be possible to find out how fast the water moves into any one part of the plant.
One would simply pass a Geiger counter over the plant at regular intervals and see where the water has gone. Radioactive tracers have applications in medicine, industry, agriculture, research, and many other fields of science and technology.
But it is possible to measure how long it takes for half the nuclei of a piece of radioactive material to decay.
This is called the half-life of the radioactive isotope.
In the next two days, it drops from 40 to 20 - it halves.Plants and animals assimilate carbon 14 from carbon dioxide throughout their lifetimes.When they die, they stop exchanging carbon with the biosphere and their carbon 14 content then starts to decrease at a rate determined by the law of radioactive decay.Radioactive tracers are substances that contain a radioactive atom to allow easier detection and measurement.(Radioactivity is the property possessed by some elements of spontaneously emitting energy in the form of particles or waves by disintegration of their atomic nuclei.) For example, it is possible to make a molecule of water in which one of the two hydrogen atoms is a radioactive tritium (hydrogen-3) atom.American physical chemist Willard Libby led a team of scientists in the post World War II era to develop a method that measures radiocarbon activity.