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Radioactive isotopes are effective tracers because their radioactivity is easy to detect.A is a substance that can be used to follow the pathway of that substance through some structure.

Neutrons from a research reactor can interact with atoms in a sample causing the emission of gamma rays which, when analysed for characteristic energies and intensity, will identify the types and quantities of elements present.In common dialogue, the term fossil fuel also includes hydrocarbon-containing natural resources that are not derived from animal or plant sources.These are sometimes known instead as mineral fuels.Most commercial analysers use californium-252 neutron sources together with sodium iodide detectors and are mainly sensitive to TNC reactions.Other use Am-Be-241 sources and bismuth germanate detectors, which register both TNC and NIS.

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Amy Jeurgens Underwood Born: 1993 Occupation: Student Family: Anne Jeurgens (mother) George Jeurgens (father) Ashley Jeurgens (sister) Robby Jeurgens (maternal-brother) John Jeurgens (son) Ricky Underwood (husband) Romances: Ben (ex) Jimmy (ex) First Episode: Falling in love (01x01) Last Episode: Thank you and goodbye (05x24) Portrayed by: Shailene Woodley At the start of the show, Amy is a freshman at Ulysses S.