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Novel methods for measuring afterglow in developmental scintillators for X-ray and neutron detection
Authors:C.M. Bartle  A. EdgarL. Dixie  C. VaroyR. Piltz  S. BuchananK. Rutherford
Affiliation:a National Isotope Centre, GNS Science, PO Box 31312, Lower Hutt 5040, New Zealand
b School of Chemistry and Physics, Victoria University of Wellington, Wellington 6140, New Zealand
c Bragg Institute, ANSTO, PMB 1, Menai NSW 2234, Australia
Abstract:In this paper we discuss two novel methods of measuring afterglow in scintillators. One method is designed for X-ray detection and the other for neutron detection applications. In the first method a commercial fan-beam scanner of basic design similar to those seen at airports is used to deliver a typically 12 ms long X-ray pulse to a scintillator by passing the test equipment through the scanner on the conveyor belt. In the second method the thermal neutron beam from a research reactor is incident on the scintillator. The beam is cut-off in about 1 ms using a 10B impregnated aluminum pneumatic shutter, and the afterglow is recorded on a dual range storage oscilloscope to capture both the steady state intensity and the weak decay. We describe these measurement methods and the results obtained for a range of developmental ceramic and glass scintillators, as well as some standard scintillators such as NaI(Tl), LiI(Eu) and the plastic scintillator NE102A. Preliminary modeling of the afterglow is presented.
Keywords:Scintillators   Phosphors   Afterglow   Luminescence   X-rays   Neutrons   Imaging   Decay time   Ceramic scintillators   Glass scintillators   Convolution
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