TY  - JOUR
AU  - Olleros, P.
AU  - Caballero, L.
AU  - Domingo-Pardo, C.
AU  - Babiano, V.
AU  - Ladarescu, I.
AU  - Calvo, D.
AU  - Gramage, P.
AU  - Nacher, E.
AU  - Tain, J. L.
AU  - Tolosa, A.
PY  - 2018
DA  - 2018//
TI  - On the performance of large monolithic LaCl3(Ce) crystals coupled to pixelated silicon photosensors
T2  - J. Instrum.
JO  - Journal of Instrumentation
SP  - P03014 - 17pp
VL  - 13
PB  - Iop Publishing Ltd
KW  - Compton imaging
KW  - Detector modelling and simulations I (interaction of radiation with matter interaction of photons with matter interaction of hadrons with matter etc)
KW  - Gamma detectors (scintillators CZT HPG HgI etc)
KW  - Instrumentation and methods for time-of-flight (TOF)
KW  - spectroscopy
AB  - We investigate the performance of large area radiation detectors, with high energy-and spatial-resolution, intended for the development of a Total Energy Detector with gamma-ray imaging capability, so-called i-TED. This new development aims for an enhancement in detection sensitivity in time-of-flight neutron capture measurements, versus the commonly used C6D6 liquid scintillation total-energy detectors. In this work, we study in detail the impact of the readout photosensor on the energy response of large area (50 x 50 mm(2)) monolithic LaCl3(Ce) crystals, in particular when replacing a conventional mono-cathode photomultiplier tube by an 8 x 8 pixelated silicon photomultiplier. Using the largest commercially available monolithic SiPM array (25 cm(2)), with a pixel size of 6 x 6 mm(2), we have measured an average energy resolution of 3.92% FWHM at 662 keV for crystal thick-nesses of 10, 20 and 30 mm. The results are confronted with detailed Monte Carlo (MC) calculations, where optical processes and properties have been included for the reliable tracking of the scintillation photons. After the experimental validation of the MC model, we use our MC code to explore the impact of a smaller photosensor segmentation on the energy resolution. Our optical MC simulations predict only a marginal deterioration of the spectroscopic performance for pixels of 3 x 3 mm(2).
SN  - 1748-0221
UR  - http://arxiv.org/abs/1801.05059
UR  - https://doi.org/10.1088/1748-0221/13/03/P03014
DO  - 10.1088/1748-0221/13/03/P03014
LA  - English
N1  - WOS:000428146300004
ID  - Olleros_etal2018
ER  -