Testing scintillation transport models with photoelectron yields measured under different surface finishes
- 23 November 2002
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- Vol. 1 (10823654) , 824-828
- https://doi.org/10.1109/nssmic.1997.672708
Abstract
The UNIFIED, POLISH, and GROUND surface models of the optical photon transport program DETECT are tested for their capacity to predict the photoelectron yields measured with crystals of different surface finishes and reflective coats. Here, two BGO crystals of 5.6/spl times/12.8/spl times/29.7 mm, with respectively a polished and a corrugated surface finish are considered. Stylus profilometer scans are first taken to quantify their surface roughness. The crystals are then prepared in three different surface coat configurations to subsequently measure the photoelectron yield collected when they are excited by a beam of 511 keV photons. These measurements are used to confront the models' predictions on absolute ground. The results indicate that the transport of scintillation photons internally trapped within the volume of a highly polished crystal is well accounted for. However, significant discrepancies are noted between simulations and measurements when considering a corrugated finish or when the surface is coated by a diffuse reflector. Possible explanations are discussed and call for further investigations.Keywords
This publication has 12 references indexed in Scilit:
- A more physical approach to model the surface treatment of scintillation counters and its implementation into DETECTPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2002
- Toward a model accounting for the impact of surface treatment on the performances of scintillation countersPublished by SPIE-Intl Soc Optical Eng ,1997
- An improved model for the energy resolution of multicrystal encoding detectors for PETIEEE Transactions on Nuclear Science, 1997
- A model of optical reflection on rough surface and its application to Monte Carlo simulation of light transportIEEE Transactions on Nuclear Science, 1996
- Non-proportionality in the scintillation response and the energy resolution obtainable with scintillation crystalsIEEE Transactions on Nuclear Science, 1995
- A simulation to model position encoding multicrystal PET detectorsIEEE Transactions on Nuclear Science, 1995
- Direct and inverse problems for light scattered by rough surfacesApplied Optics, 1990
- Theoretical modelling of light transport in rectangular parallelepipedic scintillatorsNuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1990
- Light collection in scintillation detector composites for neutron detectionIEEE Transactions on Nuclear Science, 1988
- Monte Carlo Calculations of the Optical Coupling between Bismuth Germanate Crystals and Photomultiplier TubesIEEE Transactions on Nuclear Science, 1982