Topic
Scintillation
About: Scintillation is a research topic. Over the lifetime, 14022 publications have been published within this topic receiving 187694 citations.
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TL;DR: An 11.8km optical link is established to examine the intensity fluctuation of the laser beam transmission through atmosphere turbulence, and the daily variation curve of scintillation index is given.
Abstract: An 11.8km optical link is established to examine the intensity fluctuation of the laser beam transmission through atmosphere turbulence. Probability density function, fade statistic, and high-frequency spectrum are researched based on the analysis of the experimental data collected in each season of a year, including both weak and strong fluctuation cases. Finally, the daily variation curve of scintillation index is given, compared with the variation of refractive-index structure parameter C(n) (2), which is calculated from the experimental data of angle of arrival. This work provides the experimental results that are helpful to the atmospheric propagation research and the free-space optical communication system design.
55 citations
TL;DR: In this paper, the relationship between the most commonly used measures of scintillation depth was deduced assuming that the probability density of amplitude distribution is Nakagami's m-distribution.
55 citations
TL;DR: The gamma-ray scintillation camera used in these studies was the Pho/Gamma manufactured by Nuclear-Chicago and adequately described by Anger (1–3) in a number of communications, which represents a distinct advantage over the conventional automatic scintillation scanner.
Abstract: The gamma-ray scintillation camera used in these studies was the Pho/Gamma manufactured by Nuclear-Chicago and adequately described by Anger (1–3) in a number of communications. This apparatus represents a distinct advantage over the conventional automatic scintillation scanner. The conventional scanner covers a given point briefly during its transverse, and a relatively high count rate is required to discriminate variations of concentration within an organ. On the other hand, the gamma camera sees each point continuously within its 9-in. diameter useful field and can be set to record as many total counts as are necessary to visualize these variations. For the usual dose of radioactive test agent employed in conventional automatic scintillation scanning the gamma camera can visualize the target in one-fifth to one-twentieth of the time of the conventional. Conversely, much smaller test doses and longer recording times can be used with the gamma camera, with reduced radiation exposure to the patient (4). A...
55 citations
TL;DR: In this article, the influence of air contamination on the VUV scintillation yield in gaseous argon at atmospheric pressure is investigated, and with a radioactive α-source the photon yield for various partial air pressures and different reflectors and wavelength shifters is determined.
Abstract: The influence of air contamination on the VUV scintillation yield in gaseous argon at atmospheric pressure is investigated. We determine with a radioactive α-source the photon yield for various partial air pressures and different reflectors and wavelength shifters. We find that the time constant of the slow scintillation component depends on gas purity and is a good indicator for the total VUV light yield, while the fast component is not affected. This dependence is attributed to impurities destroying the long-lived triplet argon excimer state. The population ratio between the slow and the fast decaying excimer states is determined for α-particles to be 5.5 ± 0.6 in argon gas at 1100 mbar and room temperature. The measured decay time constant of the slow component is 3.140 ± 0.067 μs at a partial air pressure of 2 × 10−6 mbar.
55 citations
TL;DR: A new method based on sharing and redirection of scintillation light among multiple detectors, together with attenuation of light over the length of the crystals is presented, allowing the development of a PET scanner with good spatial, energy and timing resolutions while keeping the complexity of the system low.
Abstract: A new method for obtaining depth of interaction (DOI) information in PET detectors is presented in this study, based on sharing and redirection of scintillation light among multiple detectors, together with attenuation of light over the length of the crystals. The aim is to obtain continuous DOI encoding with single side readout, and at the same time without the need for one-to-one coupling between scintillators and detectors, allowing the development of a PET scanner with good spatial, energy and timing resolutions while keeping the complexity of the system low. A prototype module has been produced and characterized to test the proposed method, coupling a LYSO scintillator matrix to a commercial SiPMs array. Excellent crystal separation is obtained for all the scintillators in the array, light loss due to depolishing is found to be negligible, energy resolution is shown to be on average 12.7% FWHM. The mean DOI resolution achieved is 4.1 mm FWHM on a 15 mm long crystal and preliminary coincidence time resolution was estimated in 353 ps FWHM.
55 citations