Explore: Radioactive Tracers In Fluid Dynamic Measurements

gradient. This type of diffusion can be followed using isotopic tracers, hence the name. The tracer diffusion is usually assumed to be identical to self-diffusion

Accurate measurements require weighing the tubes before and after sample collection to calculate the actual volume based on fluid density. Tracer concentrations

investigation is that of the radioactive tracer, used to evaluate wear at macroscopic levels. One of the two materials in contact, involved in a wear process, is

stimulated radioactive responses, electromagnetic, nuclear magnetic resonance, pressure and other properties of the rocks and their contained fluids. For this

containing both a heavy oxygen and hydrogen, is useful as a non-radioactive isotopic tracer. Compared to the isotopic change of hydrogen atoms, the isotopic

without ionizing radiation (X-rays) or radioactive tracers. The first MR images of a human brain were obtained in 1978 by two groups of researchers at EMI

the bulk phase theories.[citation needed] With the development of radioactive tracers, it was shown that cells are not impermeable to Na+ . This was difficult

involves labeling microspheres with radioactive isotopes and injecting these into the test subject. Perfusion measurements are taken by comparing the radioactivity

why it is a product of both nuclear fusion and radioactive decay. The most common isotope of helium in the universe is helium-4, the vast majority of

had studied blood flow by NMR relaxation time measurements of blood in living humans. Such measurements were not introduced into common medical practice