As a boy Zedd had used tracers of magic to learn his way through.

Under no circumstances did they use tracers.

We'll have to use tracers on it," Stone said.

Is it okay if I use tracers?

This type of diffusion can be followed using isotopic tracers, hence the name.

Nuclear Medicine Physicians are medical specialists that use tracers, usually radiopharmaceuticals, for diagnosis and therapy.

He developed methods to follow and measure this metabolism by using radioactive tracers that were infused into bodily tissue.

He used radioactive tracers a good deal, to follow individual termites around.

Compartmental modeling in biomedical sciences primarily originated from the need to study metabolism by using tracers.

Vida talks about her work - studying ocean currents, what is in them and how they move around, using tracers they had developed.