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Nomenclature Nuclear Chemistry
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Terms: Nuclear Chemistry[U]
  • ULTRATRACE ANALYSIS This term could be used generally to describe the whole area of trace analysis using micro-sized samples, but could be more precisely specified as trace analysis with sample size £ 10-4 g and constituent content £ ppm (0.01%). C. See subtrace analysis.
  • UNSEALED SOURCE A radioactive source which is not encapsulated, in contrast to a sealed source.
  • UNSTABLE Radioactive.
  • URANIUM SERIES The natural decay chain commencing with 238U and ending with stable 206Pb. The mass number of each member of the series is representable as 4n+2 where n is an integer.
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.:: Radiochemistry.org 2003 ::.