The rates at which radioactive decay occur are constant and measurable using the isotope's half-life.
The half-life of a radioactive element is the time required for half the isotope to decay to form the stable daughter isotope.
According to the Smithsonian Institute, using radiodating of sedimentary rock tells the date of formation of the original igneous rock, which, through the processes of weathering and erosion, formed the layers of the sedimentary rock.
Radiodating determines the maximum age of sedimentary rock. Geological Survey states that it is possible to use Carbon-14 radiometric dating for sedimentary rock younger than 50,000 years by dating once living material from the sediment.
Scientists look at half-life decay rates of radioactive isotopes to estimate when a particular atom might decay.
This stuff is important to know when using radioactive isotopes as medical tracers, which are taken into the body to allow doctors to trace a pathway or find a blockage, or in cancer treatments.However, human groups have often mixed C3 and C4 plants (northern Chinese historically subsisted on wheat and millet), or mixed plant and animal groups together (for example, southeastern Chinese subsisting on rice and fish).Radioactive elements were incorporated into the Earth when the Solar System formed.If a layer of igneous rock forms on top of the sedimentary rock, scientists determine an age bracket for the rock sample, but not an absolute age. However, the relatively short half-life of approximately 5,730 years makes it inappropriate for older samples.For dating older materials, scientists use isotopes of other elements, some of which have a half-life of 106 billion years.