Development of a Submillimeter Portable Gamma-Ray Imaging Detector, Based on a GAGG:Ce—Silicon Photomultiplier Array

Author(s):  
S. David ◽  
I. Kandarakis
2020 ◽  
Vol 225 ◽  
pp. 07002
Author(s):  
H. Al Hamrashdi ◽  
S. D. Monk ◽  
D. Cheneler

The design and configuration of a multi-layered imaging system with the ability to detect thermal neutrons, fast neutrons and gamma rays has been developed and its efficacy demonstrated. The work presented here numerically determines the systems efficiency and spatial resolution, using 252Cf and 137Cs as a case study. The novelty of this detection system lies in the use of small form factor detectors in a three-layer design, which utilises neutron elastic scattering and Compton scattering simultaneously. The current configuration consists of 10 mm thick natural lithium glass (GS10) scintillator integrated with a 20 mm thick plastic scintillator (EJ-204) in the first layer, a 15 mm thick lithium glass (GS10) scintillator in the second and a 30 mm thick CsI(Tl) scintillator forming the final layer. Each of these layers is backed with an 8 x 8 silicon photomultiplier diode (SiPM) array. The overall size of the imaging system is 27 mm x 27 mm x 135 mm. MCNPv6.1 and Geant4-10.04 were alternatively used to optimise the overall configuration and to investigate detection modalities. Results show promising performance with high precision source localisation and characterization abilities. Measurements were virtually obtained of two gamma-ray sources within steel enclosures at angles of 15°, 30° and 50° separation in order to test spatial resolution ability of the system. With the current active size of the system and the 8x8 SiPM configuration, the results estimate the spatial resolution to be close to 30°. The ability of the system to characterise and identify sources based on the type and energy of the radiation emitted, has been investigated and results show that for all radiation types the system can identify the source energy within the energy range of typical reported sources in literature.


2013 ◽  
Vol 336-338 ◽  
pp. 373-378
Author(s):  
Cui Lan Zhao ◽  
Yong Ping Li ◽  
Li Hong Chen ◽  
Chao Yuan ◽  
Yu Jin Qi

Cerium activated lanthanum bromide (LaBr3:Ce3+) scintillator crystal has shown very promising characteristics for high-resolution and high-sensitivity gamma ray imaging and spectrometric applications [1,2,. In this paper, we present some preliminary results of a compact gamma camera based on LaBr3:Ce3+ crystal. The detector module consists of a continuous LaBr3:Ce3+ crystal with a sensitive area of 50x50 mm2 and 5mm thickness coupling to a Hamamatsu H8500 position-sensitive photomultiplier tube (PSPMT). A compact multiplexed readout based on symmetric charge division circuit (SCD) was developed to reduce the 64 anode signal to 16 readout channels, and a resistive division network to reduce the readout channels from 16 to 4. The performance of the imaging detector module was tested using a 57Co source. The preliminary results showed that this detector module can achieve an effective field-of-view (FOV) of ~39x39 mm2 with a good intrinsic spatial resolution around 1.5mm and energy resolution of 9.2% at 122 keV.


Author(s):  
A. Takeda ◽  
H. Kubo ◽  
K. Miuchi ◽  
T. Nagayoshi ◽  
Y. Okada ◽  
...  

2003 ◽  
Vol 50 (4) ◽  
pp. 1048-1052 ◽  
Author(s):  
T. Mitani ◽  
H. Nakamura ◽  
S. Uno ◽  
T. Takahashi ◽  
K. Nakazawa ◽  
...  

2017 ◽  
Vol 64 (7) ◽  
pp. 1833-1839 ◽  
Author(s):  
Eungi Min ◽  
Young-Jun Jung ◽  
Hakjae Lee ◽  
Jinwook Jang ◽  
Kyeong Min Kim ◽  
...  

2004 ◽  
Vol 51 (5) ◽  
pp. 2140-2144 ◽  
Author(s):  
A. Takeda ◽  
H. Kubo ◽  
K. Miuchi ◽  
T. Nagayoshi ◽  
Y. Okada ◽  
...  

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