Date of Award


Document Type

Union College Only

Degree Name

Bachelor of Science


Physics and Astronomy

First Advisor

Heather Watson


Electron, Positron, Annihilation, EPALS, Spectroscopy, Radiation, Defect, Vacancy, Crystal


This experiment crafted an electron-positron annihilation spectrometer in order to conduct electron-positron annihilation lifetime spectroscopy (EPALS) in the Union College Ion Beam Analysis Laboratory. EPALS, as a method of spectroscopy, is tool used for material analysis. We constructed an apparatus to employ this as a method of crystalline defect analysis. Using EPALS, we obtained spectra for samples of pure iron and MgO crystals. We analyzed these spectra to make measurements of various positron lifetimes and thus various defect types within our samples. In this thesis, the preliminary results will be discussed.