G. Colombo, A. Caracciolo, D. Mazzucconi, G. Borghi, M. Carminati, N. Protti, S. Altieri, S. Agosteo, C. Fiorini
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引用次数: 0
Abstract
We present a study on the neutron activation of a gamma-ray
detector for a BNCT-SPECT dose imaging system. The detector is based
on a LaBr3(Ce+Sr) scintillator crystal, coupled with a matrix
of Silicon Photomultipliers (SiPMs), read by a dedicated electronics
system. This detector has successfully demonstrated to be capable to
identify the 10B compounds when irradiating borated vials with
thermal neutrons. However, a background signal around 478 keV was
detected, suggesting the activation of the detector itself. This
study aims to determine the origin of this background signal by
simulating the two main parts of the detector, which are the crystal
and electronic boards, in order to assess their contribution to the
background signal. The results of the FLUKA simulations show that
the neutron capture reactions on both the crystal and electronic
boards cause a relevant background nearby the BNCT signal, thereby
limiting the detector's sensitivity. To address this issue, a
customized cadmium shielding has been developed. This solution was
tested at the TRIGA Mark II research nuclear reactor of Pavia
University, where experimental measurements and corresponding FLUKA
simulations proved its effectiveness.
期刊介绍:
Journal of Instrumentation (JINST) covers major areas related to concepts and instrumentation in detector physics, accelerator science and associated experimental methods and techniques, theory, modelling and simulations. The main subject areas include.
-Accelerators: concepts, modelling, simulations and sources-
Instrumentation and hardware for accelerators: particles, synchrotron radiation, neutrons-
Detector physics: concepts, processes, methods, modelling and simulations-
Detectors, apparatus and methods for particle, astroparticle, nuclear, atomic, and molecular physics-
Instrumentation and methods for plasma research-
Methods and apparatus for astronomy and astrophysics-
Detectors, methods and apparatus for biomedical applications, life sciences and material research-
Instrumentation and techniques for medical imaging, diagnostics and therapy-
Instrumentation and techniques for dosimetry, monitoring and radiation damage-
Detectors, instrumentation and methods for non-destructive tests (NDT)-
Detector readout concepts, electronics and data acquisition methods-
Algorithms, software and data reduction methods-
Materials and associated technologies, etc.-
Engineering and technical issues.
JINST also includes a section dedicated to technical reports and instrumentation theses.