Performance of a new accelerating-electrode-equipped fast-time-response PMT coupled with fast LGSO.

In this study, we measured the performance of a newly developed Hamamatsu Photonics R13478 photomultiplier tube (PMT) and compared the results with those for an existing R9800 PMT. In R13478, an accelerating electrode is placed between the focusing electrode and first dynode for time resolution improvement through reduced transit time jitter. We investigated the time resolution dependence on the supply voltage and time pickoff method for R13478 and R9800 PMTs, each coupled with a 2.9 × 2.9 × 20 mm3 fast LGSO:Ce (0.025 mol%) crystal. In addition, we measured the PMT time resolutions coupled with the crystals in edge and laid positions to determine the effects of the reduced position dependence of transit time of R13478. R13478 exhibited better time performance than R9800 in various ways. The rise time of R13478 for our experimental setup was 1.54 ns, 100 ps shorter than that of R9800 because of the reduced transit time. Further, R13478 achieved a 169 ps single time resolution at the recommended supply voltage, while this value was 187 ps for R9800. The time resolution of R13478 was also significantly better for a low time pickoff threshold level and a high supplied voltage, which are conditions vulnerable to transit time jitter and noise, respectively. A considerable difference in time resolution was observed for the laid position (R13478: 144 ps; R9800: 167 ps), indicating that the accelerating electrode reduced spatial transit time difference. Overall, we showed ...
Source: Physics in Medicine and Biology - Category: Physics Authors: Tags: Phys Med Biol Source Type: research

Related Links:

ConclusionWithin the limitations of the study, GBR with or without autogenous block graft may be an effective approach in augmenting horizontally deficient mandibular or maxillary ridges, before the placement of dental implants. However, more complications may be seen with the use of an autogenous block graft related to the donor sites.
Source: Journal of Evidence Based Dental Practice - Category: Dentistry Source Type: research
In conclusion, this study presents the novel finding that the PVS periductium is composed of squamous MCs. These cells tightly line the luminal surface of the PVS tissue, including PNs, PVs, and small branches of the PVs in the abdominal cavity. These results will help researchers understand the role of the PVS in hyaluronan secretion, tissue repair, inflammation, and tumorigenesis, as well as the fine structure of PVS tissue.
Source: Journal of Acupuncture and Meridian Studies - Category: Complementary Medicine Source Type: research
Publication date: Available online 16 November 2019Source: Materials Today: ProceedingsAuthor(s): Vijay Kumar Chavan, M. SreenivasuluAbstractVanadium ion doped zinc lead lithium phosphate glass samples are prepared by melt quench method. X-ray diffraction studies confirmed the amorphous nature of all the prepared glasses. The density and refractive index values of these glasses are evaluated using the Archimedes method and Abbe’s refractometer respectively. The values of density found to be in between 3.6363 and 3.6666 g/cm3. The refractive index values are observed in the range 1.5605–1.5620. An increasing t...
Source: Materials Today: Proceedings - Category: Materials Science Source Type: research
Publication date: Available online 16 November 2019Source: Materials Today: ProceedingsAuthor(s): K. Sowri Babu, V. Himamaheswara Rao, D. Demudu BabuAbstractThe preparation of ZnO-graphite nanocomposite in a novel route by two step process is reported in this paper. In the first step, ZnO nanoparticle solution is prepared by sol-gel method. In the next step, certain quantity of as prepared ZnO nanoparticle gel is added to the graphite powder and grinded for sufficient time to drive the ZnO nanoparticles into the pores of graphite. The powder prepared by the above process was annealed at different temperatures from 500 &d...
Source: Materials Today: Proceedings - Category: Materials Science Source Type: research
Publication date: Available online 16 November 2019Source: Materials Today: ProceedingsAuthor(s): Vinay Kumar Jain Bohra, Ruben Nerella, Sri Rama Chand MadduruAbstractA Geopolymer is a new generation material widely used in construction industry. It is the sustainable one in which the waste materials produced from thermal power stations are used as partial or complete replacement of cement to make the environment free from the release of carbon dioxide emission from cement manufacturing companies. The paper deals with the study of material properties, processing &characterization of fly ash based Geopolymer. The paper ...
Source: Materials Today: Proceedings - Category: Materials Science Source Type: research
Publication date: Available online 16 November 2019Source: Materials Science and Engineering: CAuthor(s): Ju-Hui Wu, Ker-Kong Chen, Chih-Yeh Chao, Yen-Hao Chang, Je-Kang DuAbstractTo instill pure Ti with an antibacterial effect, Cu was added by metallurgical alloying to produce Ti–5 wt% Cu alloy (Ti–5Cu alloy). The precipitation of the likes of Ti2Cu in a Ti–Cu alloy is one of the factors that influences its antibacterial property. However, in the present study, Ti–5Cu alloy precipitates with different microstructures were obtained by applying heat treatment at different temperatures and for diffe...
Source: Materials Science and Engineering: C - Category: Materials Science Source Type: research
Publication date: Available online 15 November 2019Source: Materials Science and Engineering: CAuthor(s): Nooshin Zandi, Roya Lotfi, Elnaz Tamjid, Mohammd Ali Shokrgozar, Abdolreza SimchiAbstractCoaxial electrospinning with the ability to use simultaneously two separate solvents provides a promising strategy for drug delivery. Nevertheless, controlled release of hydrophilic and sensitive therapeutics from slow biodegradable polymers is still challenging. To address this gap, we fabricated core-sheath fibers for dual delivery of lysozyme, as a model protein, and phenytoin sodium as a small therapeutic molecule. The sheath w...
Source: Materials Science and Engineering: C - Category: Materials Science Source Type: research
Publication date: Available online 16 November 2019Source: Journal of Materials Science &TechnologyAuthor(s): Liang Wu, Xingxing Ding, Zhicheng Zheng, Aitao Tang, Gen Zhang, Andrej Atrens, Fusheng PanAbstractA doublely-doped layered double hydroxide (LDH) film was produced on an anodized magnesium alloy AZ31. The Ce-doped Mg-Al LDH film was prepared by in-situ hydrothermal treatment method, and the intercalation of vanadate was realized by ion-exchange reaction. The structure, morphology and composition of as-prepared LDH film were investigated by X-ray diffractometer, field-emission scanning electronic microscope and ...
Source: Journal of Materials Science and Technology - Category: Materials Science Source Type: research
Publication date: Available online 16 November 2019Source: Journal of Materials Science &TechnologyAuthor(s): Bo Song, Qian Yan, Yusheng ShiAbstractThe influence of the microstructure on mechanical properties of AlSi10Mg fabricated by casting and selective laser melting (SLM) were investigated and contrasted in this work, with an emphasis on understanding the forming mechanism. The microstructure, phase structure and mechanical properties were characterized by scanning electron microscopy/field-emission Transmission Electron Microscopy (SEM/TEM), X-Ray Diffraction (XRD), tensile and fatigue tests. The results indicated...
Source: Journal of Materials Science and Technology - Category: Materials Science Source Type: research
Publication date: Available online 16 November 2019Source: Journal of Materials Science &TechnologyAuthor(s): Yong Hua, Sikiru Mohammed, Richard Barker, Anne NevilleAbstractAppropriate materials for injection pipelines and tubing for carbon dioxide geologic storage is fundamental to ensure asset integrity and save cost. This paper evaluates the corrosion behaviour of X65, 1Cr, 3Cr and 5Cr, which have the potential to be injection pipeline/tubing materials. The influence of steel Cr content on the general and localised corrosion behaviour was investigated at time periods from 6 to 192 h at 60 ⁰C and 100 ...
Source: Journal of Materials Science and Technology - Category: Materials Science Source Type: research
More News: Biology | PET Scan | Physics | Study