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The angular dependence of pulse shape discrimination and detection sensitivity in cylindrical and cubic EJ-309 organic liquid scintillators

Research output: Contribution to Journal/MagazineJournal articlepeer-review

Article numberT01005
<mark>Journal publication date</mark>17/01/2017
<mark>Journal</mark>Journal of Instrumentation
Number of pages15
Publication StatusPublished
<mark>Original language</mark>English


Liquid scintillators are used widely for neutron detection and for the assay of nuclear
materials. However, due to the constituents of the detector and the nitrogen void within the
detector cell, usually incorporated to accommodate any expansion that might occur to avoid leakage,
fluctuations in detector response have been observed associated with the orientation of the detector
when in use. In this work the angular dependence of the pulse-shape discrimination performance
in an EJ309 liquid scintillator has been investigated with 252Cf in terms of the separation of γ-ray
and neutron events, described quantitatively by the figure-of-merit. A subtle dependence in terms
of pulse-shape discrimination is observed. In contrast, a more significant dependence of detection
sensitivity with the angle of orientation is evident.