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" ... Before undergoing the scan, patients are injected with a glucose solution tagged with radioactive nuclides, or tracers. Once the solution is circulated through the body, which takes about an hour, the patient is placed inside the scanner which constructs a three-dimensional image based on gamma rays set off by the emission of positrons from the tracers in the solution. ... "
" ... Note that the list of elements has no end. You can extend it as much as you like, and if there’s a gap of very unstable nuclides, followed by stable or nearly stable ones again, then our present table can accommodate. So again, the chance that the universe has a surprise for us, depends entirely on something wedged in between elements we know, which means somebody finding fractionally-charged protons and electrons, or something like them. That’s not likely. ... "
" ... Radiation release for the 3 most important nuclides, (I-129, Cl-36, Se-79) with a fault intersecting ... [+] the repository’s disposal section and extending up to the aquifer. Release is 1000 times below normal background anywhere in America. ... "