BNC 970 Portable Multi-Channel Analyzer (MCA) - Manual (Page 34)

Model 970 Instruction Manual 31
Pri. This column of radio buttons is used to indicate which energy is designated as the “primary
peak” for the isotope. The primary peak MUST be present in a spectrum (in addition to the
secondary peak) in order to positively identify the isotope and activity will be calculated based in
the primary peak. Therefore, the energy with the highest yield is usually designated as the
primary peak. It is acceptable to designate the same energy as both the primary and secondary
peaks, but the energy must be enabled.
Sec. This column of radio buttons is used to indicate which energy is designated as the
“secondary peak” for the isotope. The secondary peak MUST be present in a spectrum (in
addition to the primary peak) in order to positively identify the isotope. It is acceptable to
designate the same energy as both the primary and secondary peaks, but the energy must be
enabled.
Energy (keV) This column displays each specific energy, in keV, of the currently selected isotope.
Yield (%) This column displays the specific yield (or abundance) of each specific energy,
expressed as a percent (photons per 100 disintegrations at that energy).
Comment This column provides a section for users to enter a comment or note regarding the
particular energy. For example, all multiplets contain “MUL” in the comment field.
Once a Library has been edited and saved, it must be specifically loaded into SNAP-MCA (using
Load Library…
under the Library Menu) for the changes to be seen.