Performance of Large, Modularized NaI(Tl) Detectors

The properties of detector arrays made up of NaI(Tl) Polyscin modules 20 in. deep and of hexagonal cross section and the development of a Monte Carlo code of general use in the design of such detectors are described. The use of modularized NaI(Tl) detectors in the study of a new spectroscopy of ?-rays in high energy physics is outlined.