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I've been researching medical isotopes and alot of them decay by an IT path. Does anyone know what IT stands for? And what physical process is happening?

Example: http://www.nndc.bnl.gov/nudat2/getbandplot.jsp?unc=nds

Band 2 decays by IT 99.99% of the time

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For those curious I was able to find an answer. IT stands for Isomeric Transition. A metastable state emits a photon to decay to a lower energy

List of decay modes: http://ie.lbl.gov/education/decmode.html

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