Response of NaI(Tl), KI(Tl), and Stilbene to Fission Fragments

Abstract

The scintillations produced in NaI(Tl), KI(Tl), and stilbene by fission fragments are found to be about twice as large as those produced by 5-Mev alpha particles. The superior resolution of the inorganic crystals clearly separates the light and heavy fragment groups. The larger scintillations are associated with the more energetic light-fragment group. The pulse height as a function of residual range was measured for both groups in KI(Tl), whence it was found that at large values of the specific energy loss the specific fluorescence again increases rapidly.