Title: Cross-Correlation Measurements with the EJ-299-33 Plastic Scintillator
Authors: BOURNE MarkWHALEY JeffDOLAN JenniferPOLACK KFLASKA M.CLARKE Shaun D.TOMANIN AlicePEERANI PaoloPOZZI Sara
Citation: NUCLEAR INSTRUMENTS \& METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT vol. 784 p. 460-464
Publisher: ELSEVIER SCIENCE BV
Publication Year: 2015
JRC N°: JRC91337
ISSN: 0168-9002
URI: http://dx.doi.org/10.1016/j.nima.2014.10.052
http://publications.jrc.ec.europa.eu/repository/handle/JRC91337
DOI: 10.1016/j.nima.2014.10.052
Type: Articles in periodicals and books
Abstract: New organic-plastic scintillation compositions have demonstrated pulse-shape discrimination (PSD) of neutrons and gamma rays. We present cross-correlation measurements of 252Cf and mixed uranium-plutonium oxide (MOX) with the EJ-299-33 plastic scintillator. For comparison, equivalent measurements were performed with an EJ-309 liquid scintillator. Offline, digital PSD was applied to each detector. These measurements show that EJ-299-33 sacrifices a factor of 5 in neutron-neutron efficiency relative to EJ-309, but could still utilize the difference in neutron-neutron efficiency and neutron singles-to-doubles ratio to distinguish 252Cf from MOX. These measurements were modeled with MCNPX-PoliMi, and MPPost was used to convert the detailed collision history into simulated cross-correlation distributions. MCNPX-PoliMi predicted the measured 252Cf cross-correlation distribution for EJ-309 to within 10%. Greater photon uncertainty in the MOX sample led to larger discrepancy in the simulated MOX cross-correlation distribution. The modeled EJ-299-33 plastic also gives reasonable agreement with measured cross-correlation distributions, although the MCNPX-PoliMi model appears to under-predict the neutron detection efficiency.
JRC Directorate:Nuclear Safety and Security

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