Simulating Scintillator Light Collection Using Measured Optical Reflectance

Janecek, Martin; Moses, W.W.

doi:10.1109/tns.2010.2042731

Cited by 83 publications

(70 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An external diffuse reflector was also modeled with a reflection coefficient of 0.99. These values have been verified to be good approximations of a mechanically polished surface wrapped with Teflon tape [10]. To accurately model the response of these detectors, it is not only important to model the crystal and reflector parameters, but also the emission spectrum of the scintillator as well as the absorption spectrum of the photodetector.…”

Section: Simulation Study To Understand Light Transport Physics Imentioning

confidence: 78%

Evaluation of large volume SrI<inf>2</inf>(Eu) scintillator detectors

Sturm

Cherepy

Drury

et al. 2010

IEEE Nuclear Science Symposuim &Amp; Medical Imaging Conference

View full text Add to dashboard Cite

Abstract-There is an ever increasing demand for gamma-ray detectors which can achieve good energy resolution, high detection efficiency, and room-temperature operation. We are working to address each of these requirements through the development of large volume SrI 2 (Eu) scintillator detectors. In this work, we have evaluated a variety of SrI 2 crystals with volumes >10 cm 3 . The goal of this research was to examine the causes of energy resolution degradation for larger detectors and to determine what can be done to mitigate these effects. Testing both packaged and unpackaged detectors, we have consistently achieved better resolution with the packaged detectors. Using a collimated gamma-ray source, it was determined that better energy resolution for the packaged detectors is correlated with better light collection uniformity. A number of packaged detectors were fabricated and tested and the best spectroscopic performance was achieved for a 3% Eu doped crystal with an energy resolution of 2.93% FWHM at 662keV. Simulations of SrI 2 (Eu) crystals were also performed to better understand the light transport physics in scintillators and are reported. This study has important implications for the development of SrI 2 (Eu) detectors for national security purposes.

show abstract

Section: Simulation Study To Understand Light Transport Physics Imentioning

confidence: 78%

Evaluation of large volume SrI<inf>2</inf>(Eu) scintillator detectors

Sturm

Cherepy

Drury

et al. 2010

IEEE Nuclear Science Symposuim &Amp; Medical Imaging Conference

View full text Add to dashboard Cite

show abstract

“…The angular distribution of its reflection is recently measured and built in Geant4 as a look-up table model [78].…”

Section: Monte Carlo Modelmentioning

confidence: 99%

High-Energy Neutron Backgrounds for Underground Dark Matter Experiments

Chen¹

2016

View full text Add to dashboard Cite

A B S T R A C TDirect dark matter detection experiments usually have excellent capability to distinguish nuclear recoils, expected interactions with Weakly Interacting Massive Particle (WIMP) dark matter, and electronic recoils, so that they can efficiently reject background events such as gamma-rays and charged particles. However, both WIMPs and neutrons can induce nuclear recoils. Neutrons are then the most crucial background for direct dark matter detection. It is important to understand and account for all sources of neutron backgrounds when claiming a discovery of dark matter detection or reporting limits on the WIMP-nucleon cross section. One type of neutron background that is not well understood is the cosmogenic neutrons from muons interacting with the underground cavern rock and materials surrounding a dark matter detector.The Neutron Multiplicity Meter (NMM) is a water Cherenkov detector capable of measuring the cosmogenic neutron flux at the Soudan Underground Laboratory, which has an overburden of 2090 meters water equivalent. The NMM consists of two 2.2-tonne gadolinium-doped water tanks situated atop a 20-tonne lead target. It detects a high-energy (>∼ 50 MeV) neutron via moderation and capture of the multiple secondary neutrons released when the former interacts in the lead target. The multiplicity of secondary neutrons for the high-energy neutron provides a benchmark for comparison to the current Monte Carlo predictions. Combining with the Monte Carlo simulation, the muon-induced high-energy neutron flux above 50 MeV is measured to be (1.3 ± 0.2) × 10 −9 cm −2 s −1 , in reasonable agreement with the model prediction. The measured multiplicity spectrum agrees well with that of Monte Carlo simulation for multiplicity below 10, but shows an excess of approximately a factor of three over Monte Carlo prediction for multiplicities ∼ 10 − 20.In an effort to reduce neutron backgrounds for the dark matter experiment SuperCDMS SNO-LAB, an active neutron veto was developed. It is estimated that the current design of the neutron veto with a 40 cm thick layer of boron-doped liquid scintillator can achieve a > 90% efficiency for tagging the single-scatter neutrons. In addition, a one-quarter scale prototype detector for neutron veto has been built and tested. H I G H -E N E R G Y N E U T R O N B A C K G R O U N D S F O R U N D E R G R O U N D D A R K M A T T E R E X P E R I M E N T S Y U C H E N B . S . , B E I J I N G I N S T I T U T E O F T E C H N O L O G Y , B E I J I N G , C H I N A ( 2 0 0 6 ) M . S . , B E I J I N G N O R M A L U N I V E R S I T Y , B E I J I N G , C H I N A ( 2 0 0 9 ) D I S S E R T A T I O N S U B M I T T E D I N P A R T I A L F U L F I L L M E N T O F T H E R E Q U I R E M E N T S F O R T H E D E G R E E O F D O C T O R O F P H I L O S O P H Y I N P H Y S I C S S Y R A C U S E U N I V E R S I T Y D E C E M B E Dark MatterThere is compelling evidence for the existence of dark matter from astronomical and cosmological observations. In this chater, I will briefly present modern cos...

show abstract

“…Last, we presented the conceptual pentagonal detectors based on the PMT-light-sharing scheme. Monte Carlo simulation, quite useful to PET detector design [16][17][18], were performed so as to investigate the new detector designs. The results show that crystals forming a pentagon-shape detector can be decoded by Anger Logic.…”

Section: H Shi Et Al / Design Study Of Dedicated Brain Pet With Polmentioning

confidence: 99%

Design study of dedicated brain PET with polyhedron geometry

Han

et al. 2015

THC

View full text Add to dashboard Cite

Abstract. BACKGROUND: Despite being the conventional choice, whole body PET cameras with a 76 cm diameter ring are not the optimal means of human brain imaging. OBJECTIVE: In fact, a dedicated brain PET with a better geometrical structure has the potential to achieve a higher sensitivity, a higher signal-to-noise ratio, and a better imaging performance. METHODS: In this study, a polyhedron geometrical dedicated brain PET (a dodecahedron design) is compared to three other candidates via their geometrical efficiencies by calculating the Solid Angle Fractions (SAF); the three other candidates include a spherical cap design, a cylindrical design, and the conventional whole body PET. RESULTS: The spherical cap and the dodecahedron have an identical SAF that is 58.4% higher than that of a 30 cm diameter cylinder and 5.44 times higher than that of a 76 cm diameter cylinder. The conceptual polygon-shape detectors (including pentagon and hexagon detectors based on the PMT-light-sharing scheme instead of the conventional square-shaped block detector module) are presented for the polyhedron PET design. Monte Carlo simulations are performed in order to validate the detector decoding. CONCLUSIONS:The results show that crystals in a pentagon-shape detector can be successfully decoded by Anger Logic. The new detector designs support the polyhedron PET investigation.

show abstract

Simulating Scintillator Light Collection Using Measured Optical Reflectance

Cited by 83 publications

References 15 publications

Evaluation of large volume SrI<inf>2</inf>(Eu) scintillator detectors

Evaluation of large volume SrI<inf>2</inf>(Eu) scintillator detectors

High-Energy Neutron Backgrounds for Underground Dark Matter Experiments

Design study of dedicated brain PET with polyhedron geometry

Contact Info

Product

Resources

About