Short description IDENTIFY
IDENTIFY is a program designed for analysis of spectra measured with the MCA166. It can process spectra files in the *.spe or *.chn (Ortec). It includes peak search, energy, efficiency, and FWHM calibration. Energy dependent efficiencies are calculated from the detector supplier data and information about source matrix and absorbers. A program function to make custom nuklide libraries from a master nuklide library is also included.
Nuclides from a selected library are assigned to the evaluated spectra. For visual proofing calculated model spectra can be compared with the measured spectra.
At first a spectrum has to be loaded with file-load spectrum. File-load (only channel data) loads only the channel data and the previous energy calibration is kept.
With settings-energy calibration a 1-point, 2-point or 3-point energy calibration can be done.
With settings-detector function the expected FWHM can be adjusted and the efficiency is calculated from the entered detector and measurement gemetry data. Settings-visual efficiency shows graphically the calculated energy-dependent efficiency and allows to adjust it to measured values.
Settings-edit library allows to make and edit nuclide libraries from the main library.

Analysis:
Peak search: Searches the spectrum for peaks, marks them and calculates centroid, peak area, peak area error and FWHM. For peak search it is important that the FWHM found in the spectrum corresponds to the entered expected FWHM.
Auto FWHM search: Tries iteratively to adjust the expected FWHM to the evaluated FWHM. Works best with some good peaks distributed over the whole spectrum.

Functions for spectrum display:
In the upper left corner the actual position of the mouse pointer in channels and keV is shown. The bottom line shows channel and energy for cursor, right and left edge of the display. The text field in the upper left corner shows depending on selection more info about cursor (cursor info), a list of all nuclides and lines within the nuclide library (nuclide list), a list of all found peaks (peak report) or a list of all found nuclides (nuclide report).

|< or CTRL+arrow left: next found peak with smaller energy
<< or Shift+arrow left: big step (50% of display) to smaller energy
<: small step (1% of display) to smaller energy
>: small step (1% of display) to larger energy
>> or Shift+arrow right: big step (50% of display) to larger energy
>|  or CTRL+arrow right: next found peak with larger energy
0 or doubleclick on spectrum or HOME: Full spectrum display
<> or F7: zoom in (around cursor)
>< oder F8: zoom out
arrow up or down: manual scaling (only linear scale)
left mouse button click on spectrum: selected position becomes cursor position
right mouse button click on spectrum: next peak to selected position becomes cursor position
draw over spectrum with left mouse button pressed: zoom into draw over-region.
click on nuclide in the list: simulated spectrum of this nuclide is shown (model peaks on calculated background)
click on something else in the list: switch of spectra simulation
doubleclick on a nuclide: switch on or off peak labels for selected nuclide
doubleclick on something else in the list: switch off all labels
arrow key left: cursor one channel to the left
arrow key right: cursor one channel to the right
F6 key: spectrum scale is changed in the order linear, logarithmic, square root, and double logarithmic.
DEL key: peak marker is removed
INS key: peak marker is manually inserted
Save report saves the content of the list in file with the extension *.rep, print prints the content of the list to the standard printer. Print graphic prints the spectrum with the list.
Important: Identification works only as well as settings correspond to the measurement setup. Is the evaluation with the nuclide report unsatisfactory, then the evaluation of single peaks with cursor info and the comparision of measured spectra to simulated spectra may help.
