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A block of pure carbon, for instance, is made up of two kinds, or isotopes, of carbon atoms that differ somewhat in mass but have almost identical chemical properties. Scientists continue to investigate atoms and have discovered even smaller constituents of which electrons, neutrons, and protons are made.
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There are two kinds of isotopes, stable and unstable. Isotopes that are unstable are called radioactive and disintegrate at a constant decay rate. Examples of stable isotopes include carbon-12 and carbon-13. Carbon-14, and uranium-238 and -235, are examples of unstable isotopes.
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The kinds of isotopes used are as follows: ventilation-perfusion (133Xe, 13N, 99mTc-pseudogas), perfusion (131I, 99mTc), aerosol inhalation (99mTc), tumor (67Ga, 201Tl). The advantages of these procedures are expected to lead to further developments in respiratory examinations using radio isotopes.
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Is there a shortage of medical isotopes for research?; There are many different kinds of isotopes, and each isotope has different qualities that make it ideal for one use, but less ideal for another. Currently cancer researchers are not able to select from every possible isotope because only certain ones are available.
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Suppliers List, E-mail/RFQ Form, Molecular Structure, Weight, Formula, IUPAC, Synonyms for Stable Isotopes ... International Isotopes Clearing House, Inc.; Leawood, Kansas International Isotopes Clearing House, Inc. is a distributor for all kinds of isotopes and isotopica More...; www.iichinc.com...
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Isotopic signature - Wikipedia, the free encyclopedia
An isotopic signature (also isotopic fingerprint ) is a ratio of stable or unstable isotopes of particular elements found in an investigated material. The atomic mass of different isotopes affect ...
en.wikipedia.org/wiki/Isotopic_signature |
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Commonly analysed stable isotopes include oxygen, carbon, ... For example, it wasn't until 2003 that bismuth-209 was shown to be radioactive [2]. Many "stable" nuclides are possibly "meta-stable" in as much as they may be calculated to have an energy release [3] upon several possible kinds of radioactive decays.
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