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The “-” and “+” magnifying glasses, along with the slider, allow the size or zoom of the report display to be
changed.
The “Return” button closes the report window.
Using the Library Editor
Two libraries are distributed with URSA-II MCA, “UrsaLib” and UrsaLib Full. As a general rule, UrsaLib is
intended for NaI(Tl) detectors, and UrsaLib Full is intended for detectors with higher resolution. Both were
created from the same information, contained in “Radioactive Decay Data Tables” by David C. Kocher, Report
DOE/TIC-11026. The data was originally formatted for computer by Grove Engineering from information
provided by RSIC. UrsaLib Full contains all information, while UrsaLib has had photons with lower energies and
yields that are unlikely to be seen by NaI(Tl) detectors removed to improve performance. Both libraries contain
many calculated multiplets as an aid. These can, of course, be edited or disabled.
Either library can be edited and saved under a different name, creating a new library file. Isotopes and specific
photon energies can be added, edited, or deleted.
The Library Editor can be opened by selecting “Open Library Editor…” under the “Library” menu from the
URSA-II MCA main screen.
When the Library Editor is opened, no Library is initially loaded for editing. Click on the “Open Lib.” button and
select a library file for editing.
Once a library has been opened, select an individual isotope from the drop down list. All isotopes in the Library
are displayed in the list, and those that are currently enabled are shown with an asterisk. After an isotope is
selected, the screen will update to display that isotope’s information.
Use the “Enabled” or “Disabled” radio buttons to determine whether that isotope will be used in the library.
