A NaI(T1) spectrometer for γ-rays in the GeV range

As part of a program to develop methods for detecting and measuring high energy gamma rays, produced for example by the bombardment of targets with particles in the GeV range, the behavior of a large NaI(Tl) crystal spectrometer is being explored using the facilities of the Stanford Linear Accelerator Center (SLAC). In the following paragraphs we indicate the results of our initial sutdies.