I'm looking at some gamma spectroscopy calibration data, produced by a known source (semi known... the source was last calibrated 2006...)
My question is, looking at for example http://www.nucleide.org/DDEP_WG/Nuclides/Co-57_tables.pdf or http://ie.lbl.gov/toi/nuclide.asp?iZA=270057
In the table for the gamma from Co-57, the KeV and #photons values have a number in a bracket beside their main number. What is the meaning of those numbers?
My guess is it's to make sure we only have whole numbers of photons (As required).