Monte Carlo study of a double-scattering Compton camera with GEANT4

Seo, Hee; An, So Hyun; Kim, Jong Kyung; Kim, Chan Hyeong

doi:10.1016/j.nima.2007.05.164

Cited by 14 publications

(5 citation statements)

References 9 publications

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“…The angular resolutions, determined from the ARM distributions, were 7.3 and 6.5 for the source energies of 662 and 1332 keV, respectively. The limiting factor of the current system on the imaging resolution is the spatial resolution of the DSSDs [6]. Our simulation study [16] shows that the imaging resolution could be improved by % by improving the spatial resolution of the first scatterer detector from 3 mm to 1 mm strip pitch for the source energy of 511 keV.…”

Section: Discussionmentioning

confidence: 99%

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Multitracing Capability of Double-Scattering Compton Imager With NaI(Tl) Scintillator Absorber

Seo

Kim

Park

et al. 2010

IEEE Trans. Nucl. Sci.

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The Compton camera can provide 3-D images of radioactive material distribution based on a single measurement at a fixed position. The Compton camera also can image several different kinds of radioactive materials simultaneously, by means of the "multitracing" capability. In the present study, this multitracing capability was tested for a double-scattering-type Compton camera, or Double-Scattering Compton Imager (DOCI), which utilizes two double-sided silicon strip detectors (DSSDs) and one NaI(Tl) scintillation detector. Our experimental result shows that the 137 Cs and 60 Co gamma sources can be clearly distinguished in 2-D and 3-D Compton images, and that there is no significant interference between the two gamma sources. The imaging resolutions were determined to be 6.2 and 4.7 mm FWHM for the 137 Cs (662 keV) and 60 Co (1332 keV) point sources at 4 cm, respectively. The angular resolutions, determined from the angular resolution measure (ARM) distributions, were 7.3 and 6.5 for the source energies of 662 and 1332 keV, respectively. The DOCI remains under development; its imaging resolution will be further improved with the incorporation of more sophisticated detectors and the related electronics, including a faster scintillation detector (LYSO) and higher-spatial-resolution position-sensitive detectors.

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Section: Discussionmentioning

confidence: 99%

“…The 3-D location of a gamma-ray source can be determined by the intersections of three or more backprojected cones. The purpose of the DOCI is to maximize the imaging resolution; this is achieved by using high-spatial-resolution scatterer detectors to minimize the uncertainty in the determination of the interaction positions [6].…”

Section: A Imaging Principlementioning

confidence: 99%

Multitracing Capability of Double-Scattering Compton Imager With NaI(Tl) Scintillator Absorber

Seo

Kim

Park

et al. 2010

IEEE Trans. Nucl. Sci.

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“…The absorber detector in this type of Compton camera, in fact, is used only for energy gating, which is a selection condition to be an "effective event" (that is, the sum of the deposited energies in the three component detectors should match the source energy within a given margin). In the present study, all of the performance-related parameters were considered in the Monte Carlo simulations, including the details of the detector geometry, the energy resolutions of the component detectors, the discrimination level in energy measurement, and Doppler broadening in the Compton scattering process [8]. In the simulations, gamma sources were placed in a cylindrical acryl tub (15 cm diameter × 30 cm height) filled with water.…”

Section: Simulation Geometriesmentioning

confidence: 99%

Feasibility study on Compton imaging for visualization of flow patterns using radiotracers

Seo¹,

Park²,

Park³

et al. 2011

J. Inst.

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The radiotracer technique could be used in studies on multiphase flow systems by three-dimensional visualization of flow patterns, and, relatedly, there have been attempts to develop an industrial-purpose single photon emission computed tomography (SPECT) system. Compton cameras also have a great potential for industrial applications, due specifically to their inherent three-dimensional imaging capability, multi-tracing capability, and higher imaging sensitivity than imaging devices based on mechanical collimation. In the present study, the feasibility of Compton imaging for visualization of detailed flow patterns was determined using a Geant4 Monte Carlo simulation toolkit. The Compton camera considered is a double-scattering type consisting of three gamma-ray detectors: two double-sided silicon strip detectors (DSSDs) as scatterer detectors and one NaI(Tl) scintillation detector as an absorber detector. The results showed that the three-dimensional source distributions can be determined with the Compton camera under various source conditions, including a point source at the center, and two cylinderial volume sources of different dimensions or energies.

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“…The principle for determining the direction of the incoming neutron beam is similar to reconstructing events in Compton cameras [8]. In principle, three such cones should be enough to determine the direction of incoming neutrons.…”

Section: Fast Neutron Camera Modementioning

confidence: 99%

Monte-Carlo simulation of fast neutron detection with timepix

Uher

Jakůbek

2009

2009 IEEE Nuclear Science Symposium Conference Record (NSS/MIC)

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The imaging semiconductor pixel detector Timepix allows the charge collected in each of its 256x256 pixels (55 ȝm pitch) to be measured. This feature makes it suitable for applications where the energy and position of incoming radiation needs to be determinedWe are developing a fast neutron spectroscopy and radiography technique that is based on tracking protons recoiled by fast neutrons. The proposed setup consists of a hydrogen rich converter placed above the Timepix detector surface, which is irradiated by fast neutrons. The protons recoiled by neutrons interacting in the converter hit the detector and generate a track. Analysis of the tracks give the energies, positions and directions of flight of the protons. This information was used to reconstruct energy of the incoming neutrons. The neutron source position can be calculated as well.The converter can be replaced by an unknown hydrogen rich sample. In this case, the protons recoiled in the sample can be used for 3D reconstruction of the unknown sample.A Monte-Carlo simulation of the fast neutron detection process was prepared. The code was based on combination of the ROOT and SRIM/TRIM packages. The proton recoil and transport through the geometry was simulated and the energy deposited in the detector for each event was calculated. The results of the simulations compared with experiment are presented along with details of the neutron source spectrum/position and object 3D reconstruction.

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Monte Carlo study of a double-scattering Compton camera with GEANT4

Cited by 14 publications

References 9 publications

Multitracing Capability of Double-Scattering Compton Imager With NaI(Tl) Scintillator Absorber

Multitracing Capability of Double-Scattering Compton Imager With NaI(Tl) Scintillator Absorber

Feasibility study on Compton imaging for visualization of flow patterns using radiotracers

Monte-Carlo simulation of fast neutron detection with timepix

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