Response of a Large NaI(Tl) Crystal to High Energy Electrons

Abstract
The resolution function of a 9‐in.‐diam by 10‐in.‐long cylindrical NaI(Tl) crystal for incident electrons of 55‐, 72‐, and 83‐MeV energy has been measured. A wedge magnet defined the electron energy. Spark chambers were used on either side of the magnet to insure against spurious scattering of electrons and to estimate the magnet system momentum spread. The most probable pulse height from the crystal varied linearly with electron energy. The pulse‐height distribution had a full width at half‐maximum of 13.4 +0.3 or −0.7%.

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