The presentation and example problems are available here.

Gamma spectroscopy can be a useful method for non-destructive identification and characterization of nuclear or radioactive sources for emergency response, field measurements, and the laboratory. But often times analysis can be hampered by the availability or quality of analysis tools. InterSpec is an open-source ( peak- based gamma analysis tool that can be used for a wide variety of gamma detection systems and scenarios. It assists in performing nuclide identification, determination of source activity, shielding, and age. It also provides a number of other capabilities and tools useful for gamma spectroscopy and general radiation analysis.
This presentation will cover the basics of gamma spectroscopy using InterSpec, mostly from the perspective of analyzing emergency response or field data, but also applicable for some laboratory measurement scenarios. Spectra will be provided at prior to the presentation to allow following along. Basics of x-ray and gamma detection will be assumed going in, but prior spectroscopic analysis experience will not be needed. Both novice, and experienced analysts will gain an understanding of using InterSpec to analyze spectroscopic gamma data.

Will Johnson is a staff Physicist at Sandia National laboratories, and the primary developer of InterSpec, as well as a number of other radiation analysis codes. He is also a gamma spectroscopist for various reach back positions, a general radiation data analyst, and detection system developer.