What percentage indicates the radionuclide purity for FDG in terms of peak at specific MeV levels?

In the context of FDG (Fluorodeoxyglucose) used in PET imaging, radionuclide purity refers to the proportion of the desired isotope, in this case, Fluorine-18, present in the FDG preparation relative to other potentially present isotopes or contaminants. For FDG, maintaining high radionuclide purity is crucial for ensuring accurate imaging results and minimizing patient exposure to unnecessary radiation from contaminants.

The specific percentage that is often accepted as a standard for radionuclide purity is 99.5%. This indicates a very high level of purity, meaning that 99.5% of the radioactivity in the FDG preparation comes from the Fluorine-18 isotope. This standard helps to ensure that the imaging process is effective and the dosimetry calculations are accurate.

If radionuclide purity were lower, it could lead to inaccurate PET scan results and potential negative health impacts on patients due to exposure to other isotopes. Therefore, achieving and verifying a radionuclide purity of 99.5% is a key aspect of quality control in the production of FDG for clinical use.