Monte Carlo Simulated the Detection Efficiency of Different H/R Ratio of NaI:Ti Crystal

2014 ◽  
Vol 529 ◽  
pp. 391-394
Author(s):  
Jun Peng Hu ◽  
Fang Liu ◽  
Xiao Ping Ouyang
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Photon Energy ◽  
Detection Efficiency ◽  
Detector Efficiency ◽  
Incubation Effect ◽  
Optimal Dimension ◽  
R Ratio ◽  
Efficiency Increase ◽  
Γ Rays

We make use of Monte Carlo simulation to investigate the detection efficiency versus different H/R ratio of NaI:Tl detectors, and the volume of detector is constant. The energy of incident monoenergetic γ rays is 4.438 MeV, 1.331 MeV and 0.662 MeV emitted from AmO2Be,137Cs and60Co respectively. The size of NaI:Tl detector dimension is setted up to 20 groups of different radius (H) and height (R), whereas the volume of NaI:Tl crystal will not be changed. The result reveals that the detector efficiency dependence on H/R ratio of the NaI:Tl detector and the incident γ-photon energy. For very low H/R ratio, the detector efficiency increase rapidly and tend to be stable. We draw a conclusion that when the H/R ratio is approximately equal to 1.5, the incubation effect is more obvious, which contribute to the increase of detection efficiency. It is meaningful of the research, namely, it be beneficial to design the optimal dimension of detector for detecting γ rays of 4.438 MeV, 1.331 MeV and 0.662 MeV.

scholarly journals Monte Carlo Modeling and Design of Photon Energy Attenuation Layers for >10× Quantum Yield Enhancement in Si-Based Hard X-ray Detectors

Instruments ◽  
2021 ◽  
Vol 5 (2) ◽  
pp. 17
Author(s):  
Eldred Lee ◽  
Kaitlin M. Anagnost ◽  
Zhehui Wang ◽  
Michael R. James ◽  
Eric R. Fossum ◽  
...  
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Quantum Yield ◽  
Photon Energy ◽  
High Efficiency ◽  
High Energy ◽  
Yield Enhancement ◽  
X Ray ◽  
Simulation Results ◽  
Conversion Efficiencies

High-energy (>20 keV) X-ray photon detection at high quantum yield, high spatial resolution, and short response time has long been an important area of study in physics. Scintillation is a prevalent method but limited in various ways. Directly detecting high-energy X-ray photons has been a challenge to this day, mainly due to low photon-to-photoelectron conversion efficiencies. Commercially available state-of-the-art Si direct detection products such as the Si charge-coupled device (CCD) are inefficient for >10 keV photons. Here, we present Monte Carlo simulation results and analyses to introduce a highly effective yet simple high-energy X-ray detection concept with significantly enhanced photon-to-electron conversion efficiencies composed of two layers: a top high-Z photon energy attenuation layer (PAL) and a bottom Si detector. We use the principle of photon energy down conversion, where high-energy X-ray photon energies are attenuated down to ≤10 keV via inelastic scattering suitable for efficient photoelectric absorption by Si. Our Monte Carlo simulation results demonstrate that a 10–30× increase in quantum yield can be achieved using PbTe PAL on Si, potentially advancing high-resolution, high-efficiency X-ray detection using PAL-enhanced Si CMOS image sensors.

Monte Carlo simulation of GM probe and NaI detector efficiency for surface activity measurements

2013 ◽  
Vol 58 ◽  
pp. 45-51 ◽  
Author(s):  
Selena Grujić ◽  
Ivana Đorđević ◽  
Miodrag Milošević ◽  
Uranija Kozmidis-Luburić
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Surface Activity ◽  
Detector Efficiency ◽  
Activity Measurements

scholarly journals Monte Carlo-Based Performance Analysis for Underwater Continuous-Variable Quantum Key Distribution

2020 ◽  
Vol 10 (17) ◽  
pp. 5744
Author(s):  
Yiyu Mao ◽  
Xuelin Wu ◽  
Wenti Huang ◽  
Qin Liao ◽  
Han Deng ◽  
...  
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Performance Analysis ◽  
Quantum Key Distribution ◽  
Detection Efficiency ◽  
Continuous Variable ◽  
Ocean Water ◽  
Water Types ◽  
Beer's Law ◽  
Beer’S Law

There is a growing interest in the security of underwater communication with the increasing demand for undersea exploration. In view of the complex composition and special optical properties of seawater, this paper deals with a performance analysis for continuous-variable quantum key distribution (CVQKD) over an underwater link. In particular, we focus on analyzing the channel transmittance and detection efficiency based on Monte Carlo simulation for different water types, link distances and transceiver parameters. A comparison between the transmittance obtained by simple Beer’s law and Monte Carlo simulation reveals that the transmittance of underwater link may be severely underestimated in the previous underwater CVQKD research. The effect of the receiver aperture and field of view (FOV) on detection efficiency under different water types is further evaluated based on Monte Carlo. Simulation results show that the transmission distance of the underwater CVQKD system obtained by Monte Carlo simulation in pure sea water, clear ocean water and coastal ocean water is larger than that obtained by Beer’s law, while the key rate of the system in all types of water is smaller than that obtained by Beer’s law because the size and FOV of the receiver aperture are taken into account. By considering the practical system parameters, this paper establishes a comprehensive model for evaluating the security of underwater CVQKD systems with different system configurations.

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