SIMULTANEOUS APPLICATION OF (P, GAMMA) AND (P, ALPHA) CHANNELING TO THE DETECTION OF LIGHT-ELEMENTS IN CRYSTALS

Proton induced gamma emission (PIGE) and (p, alpha)-channeling have be en employed simultaneously to study the crystal location of light elem ents in LiNbO3 and LiF. Concurrent data collection eliminates uncertai nties in crystal alignment, beam energy and dose normalization for the various reactions. Utilizing an incident proton energy of 1.03 MeV, t he yield from the PIGE-channeling reaction was two orders of magnitude greater than that from the Li(p, alpha)-channeling reaction. However, Li(p, alpha)-channeling has better spatial resolution than PIGE-chann eling. We suggest using PIGE-channeling to minimize damage during alig nment or for coarse alignment and (p, alpha)-channeling for better spa tial resolution and fine alignment. This technique can also be used to detect and find the lattice location of two constituents of a crystal concurrently.