Abstract
We have characterized a Cerium doped Lanthanum Bromide (LaBr3(Ce) ) crystal coupled with the position-sensitive photo-multiplier system for the gamma-ray imaging application. One can use this detector set-up for the scanning of high purity germanium detectors for pulse shape analysis in gamma-ray spectroscopy experiments and the image formation of an object by Compton back-scattering . The sensor has been tested for energy, timing and position information of the gamma-rays interacting within the detector crystal. The GEANT4 simulation results are consistent with the experimental results. We have reconstructed the image of irradiation spots in different positions throughout the detector crystal. Position resolution is found to be around 3.5 mm with the 2 mm collimated gamma-rays. The 2-d image of hexagonal Bismuth Germanate (BGO) crystal and a cylindrical LaBr3(Ce) crystal have been reconstructed in coincidence technique. The performance of the detector for imaging application has been investigated by coincidence technique in GEANT4 simulation and compared with the experimental data. We have reconstructed the 2-d images of objects with various geometrical shapes by Compton back-scattered events of the gamma-rays. This position-sensitive detector can be used as an absorber of a Compton camera for the image reconstruction of an extended radioactive source. One can also use this kind of set-up as in radiation imaging and many other applications where the energy and source position of the gamma-ray is the main interest.
Highlights
Position Sensitive Photo Multiplier Tube (PSPMT) coupled with scintillator crystal converts the associated scintillation light into a current signal in the localized photo-cathode [1, 2]
A Ce doped LaBr3 crystal coupled with a position sensitive photo-multiplier assembly has been characterized, where the signal processing unit could be made highly compact by coupling a resistive chain with the PMT
The position sensitive detector crystal used in this work has been manufactured using pure LaBr3 with 5% doping of Ce
Summary
Position Sensitive Photo Multiplier Tube (PSPMT) coupled with scintillator crystal converts the associated scintillation light into a current signal in the localized photo-cathode [1, 2]. A LaBr3(Ce) scintillator crystal, with high light output, low self-absorption, and high sensitivity [13, 14] for low energy gamma-rays, has been coupled with a compact readout PSPMT and employed for gamma-ray imaging This detector has an energy resolution value of about 6% for 511 keV gamma-ray photo peak. In the course of data acquisition, the performance of the crystal as an imaging detector has been investigated, wherein the events due to internal radioactivity and scattering within the crystal have been suppressed as a result of acquiring data in coincidence mode In this regard, a 22Na (14 μCi) radioactive source has been used where positron-electron annihilation leads to simultaneous emission of two 511 keV gamma-rays in the diametrically opposite directions [20].
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