GeigerLog pre-release 1.6.0pre29

[ullix]

This version has some significant enhancements with respect to Calibration. An example is shown in the pic.

Open your spectro file, here a K-40 recording with a CsI device. Click the "Calib by Peaks" button, and the new window "Set Calibration by Peaks" opens. Do a mouse-middle-click on the peak to be used for calibration. This does not have to be very precise, a "nearby" click suffices, as shown in the pic. The red-marker-line is where you clicked; GeigerLog then wiggles its way to find and fit the peak and its background and color the peak green.

This works nicely very often, but not always. Two overlapping peaks on a slope - Co-60 and a small, low resolution crystal is a candidate for failing fits.

Then you adjust the fit by left/right mouse clicks, or move the red-marker-line by keyboard-keys (cursor-left/right, Alt+cursor-left/right). The current positions of red-marker-line and fit are shown in the upper-left part of the pic. Drag&Drop either number into the channel field of the isotope, here K-40. You can also edit this number manually.

A second channel needs to be defined for a linear calibration curve. With more peaks defined, up to a Polynome of 3rd order (4 parameters) can be defined. (RadiaCode uses 3 parameters). As second calibration point, Channel 0 at Energy 0 is defined, but this can be edited or deleted.

After clicking OK the new calibration is used for the current session. Clicking OK&Save saves this calibration in addition into the Metadata of the spectrum file, so will always be active in the future until changed again.