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K S Shah - One of the best experts on this subject based on the ideXlab platform.
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Fast Neutron measurements using cs 2 liycl 6 ce clyc scintillator
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, 2015Co-Authors: M B Smith, Jarek Glodo, K S Shah, R Hawrami, T Achtzehn, H R Andrews, E T H Clifford, P Forget, P Odougherty, U. ShirwadkarAbstract:Abstract Samples of Cs 2 LiYCl 6 :Ce (CLYC) scintillator have been characterized using monoenergetic Neutron beams in the energy range 4.1–5.5 MeV. Four crystals with dimensions (thickness×diameter) of 1″×1″, 1″×2″, and 2″×2″ were evaluated, including one crystal with natural concentrations of Li isotopes and three that were enriched in 6 Li. The intrinsic efficiency of CLYC for Fast-Neutron detection has been determined for the natural-Li crystal. These measurements were translated into reaction cross-sections, and show good agreement with available cross-section data for Neutron interactions with the 35 Cl component of CLYC. Furthermore, it is shown that the charged-particle energy released in the Fast-Neutron reactions on 35 Cl varies linearly with the energy of the incoming Neutron. These results verify the efficacy of CLYC for Fast-Neutron spectroscopy in a range of applications.
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New generation plastic scintillators for Fast Neutron spectroscopy and Pulse Shape Discrimination
2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS MIC), 2013Co-Authors: U. Shirwadkar, E.v.d. Van Loef, G. Markosyan, L. Soundara-pandian, V. Biteman, Simone Pozzi, A. Gueorguiev, Jarek Glodo, K S Shah, S. ClarkeAbstract:New generation of plastic scintillators have been developed at RMD for Fast Neutron detection technology. These plastics have peak emission wavelength ~ 440 nm, Fast scintillation decay
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optimizing cs2liycl6 for Fast Neutron spectroscopy
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, 2012Co-Authors: N Dolympia, Jarek Glodo, P Chowdhury, C J Guess, T Harrington, E G Jackson, S Lakshmi, C J Lister, R Hawrami, K S ShahAbstract:Abstract Cs2LiYCl6 (CLYC) has generated recent interest as a thermal Neutron detector due to its excellent n / γ - ray pulse-shape discrimination and energy resolution. Here, the capabilities of CLYC as a Fast Neutron detector and spectrometer are reported. A 1 in.×1 in. CLYC detector was used to measure the response of mono-energetic Neutrons over a range of 0.8–2.0 MeV produced via the 7Li(p,n) reaction at the University of Massachusetts Lowell 5.5 MV Van de Graaff accelerator. A broad continuum from the 6Li(n, α ) reaction was observed, as well as additional peaks below the thermal capture peak. Based on possible reactions in CLYC, the additional peaks are determined to be due to the 35Cl(n,p)35S reaction, with a Q-value of +615 keV, and corroborated in simulations using MCNPX. The average resolution of 9% for these peaks makes CLYC a promising candidate for a Fast Neutron spectrometer.
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Fast-Neutron detection and pulse shape discrimination with diphenylanthracene and tetraphenylbutadiene
2011 IEEE Nuclear Science Symposium Conference Record, 2011Co-Authors: E. V. Van Loef, U. Shirwadkar, K. Markosyan, S. Mukhopadhyay, N. Zaitseva, S. Payne, K S ShahAbstract:In this paper we report on Fast-Neutron detection and pulse shape discrimination with 9,10-diphenylanthracene and 1,1,4,4-tetraphenylbutadiene. Our research indicates that these organic scintillators have high light yields of up to 20,000 ph/MeV, a Fast scintillation decay of about 20 ns, very good Fast-Neutron detection, and excellent Neutron/gamma pulse shape discrimination.
Yuelin Zhang - One of the best experts on this subject based on the ideXlab platform.
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Reverse genetics by Fast Neutron mutagenesis in higher plants.
Functional & Integrative Genomics, 2002Co-Authors: Xin Li, Yuelin ZhangAbstract:Fast Neutron mutagenesis has long been used for forward genetic studies in plants. Only recently has it been used for reverse genetics. By combining Fast Neutron mutagenesis and high throughput PCR screening, a new knockout methodology, Deleteagene (Delete-a-gene), was developed in Arabidopsis and rice to obtain deletion mutants for target genes. Since Fast Neutron is a highly efficient mutagen that produces deletion mutations easily detectable by PCR, this method has the potential to enable reverse genetic screens in most plant species. In this review, we will discuss the use of Fast Neutron as a mutagen for creating deletion mutations, and strategies for successful application of Deleteagene in other plant species.
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a Fast Neutron deletion mutagenesis based reverse genetics system for plants
Plant Journal, 2001Co-Authors: Xin Li, Yujuan Song, Karen Century, Shelly Straight, Pamela C Ronald, Xinnian Dong, Michael Lassner, Yuelin ZhangAbstract:Summary A new reverse genetics method has been developed to identify and isolate deletion mutants for targeted plant genes. Deletion mutant libraries are generated using Fast Neutron bombardment. DNA samples extracted from the deletion libraries are used to screen for deletion mutants by polymerase chain reaction (PCR) using specific primers flanking the targeted genes. By adjusting PCR conditions to preferentially amplify the deletion alleles, deletion mutants were identified in pools of DNA samples, each pool containing DNA from 2592 mutant lines. Deletion mutants were obtained for 84% of targeted loci from an Arabidopsis population of 51 840 lines. Using a similar approach, a deletion mutant for a rice gene was identified. Thus we demonstrate that it is possible to apply this method to plant species other than Arabidopsis. As Fast Neutron mutagenesis is highly efficient, it is practical to develop deletion mutant populations with more complete coverage of the genome than obtained with methods based on insertional mutagenesis. Because Fast Neutron mutagenesis is applicable to all plant genetic systems, this method has the potential to enable reverse genetics for a wide range of plant species.
Koji Yoshii - One of the best experts on this subject based on the ideXlab platform.
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Preliminary examination of the applicability of imaging plates to Fast Neutron radiography
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, 2001Co-Authors: Masahito Matsubayashi, Koji Yoshii, Takashi Hibiki, Kaichiro Mishima, Koji OkamotoAbstract:Abstract Fast Neutron radiography is an attractive non-destructive inspection technique because of the excellent penetration characteristics of Fast Neutrons in matter. However, the difficulty of detecting Fast Neutrons reduces this attractive feature. As an experiment to overcome the difficulty, imaging plates were applied to Fast Neutron radiography. A simple combination of two sheets of imaging plates and a sheet of polyethylene as a proton emitter was examined with the (Fast Neutron, thermal Neutron and gamma ray) FTG discriminator proposed by Yoneda et al. . The experimental results showed that the method could be applicable to Fast Neutron radiography with effective discrimination of γ-rays
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Fast Neutron Radiography at reactor YAYOI
Progress in Nuclear Energy, 1998Co-Authors: Koji Yoshii, Kenzo MiyaAbstract:Abstract Fast Neutron Radiography (FNR) has been studied with use of the Fast Neutron source reactor YAYOI of the University of Tokyo. Three kinds of imaging techniques have been applied to the FNR. A CR39 nuclear track detector has been used successfully in the first FNR experiments at YAYOI. This is called as a CR39 track-etch method. The etched out images on the CR39 sheet usually have a low optical density. In order to perform an imaging technique with high resolving power and high contrast, a combination method of a thin type of luminescent converter and X-ray film (a film method) has been developed for the FNR. The converter is made of mixture of PMMA and ZnS(Ag), the thickness of which is 40 μ m. The system could observe the gap of 100 μ m. In the procedure with use of the CR39, it took long time, about 24 hours, to get images. And it took about 3 hours to get imaging results by the film method. A Fast Neutron television method (FNR-TV) was proposed for shortening the time of taking the images and for taking real time images. The same technique as a current thermal Neutron television system was applied to the system while different luminescent converter was used. The prototype converter was made of mixture of polypropylene resin and ZnS(Ag). Static images and real time images were obtained successfully by the Fast Neutron television method.
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Correction of Fast Neutron scattered components from Fast Neutron radiography images
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, 1996Co-Authors: Koji Yoshii, Hisao KobayashiAbstract:Abstract Fast Neutron Radiography (FNR) results have been successfully obtained by the use of the Fast Neutron source reactor YAYOI of the University of Tokyo. However, an effect of contrast distortion in the FNR images was observed. The intensity of scattered Fast Neutrons at the center of an object image was analyzed with a simple model of an iron cylindrical sample. Analytical results agreed well with experimental results.
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A study on the mechanism model of luminescence in Fast Neutron television converter
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, 1994Co-Authors: Koji Yoshii, Kenzo MiyaAbstract:Abstract For a real time imaging technique using a Fast Neutron radiography (FNR), a Fast Neutron television system (FNR-TV) was studied using the Fast Neutron source reactor YAYOI at the University of Tokyo. In order to obtain a good quality image with the FNR-TV, it is essential to develop a high sensitive converter to detect Fast Neutrons. A sensitive prototype converter made of polypropylene (PP) resin and ZnS(Ag) mixture was recently developed. It was called a PP converter. In this paper, the mechanism models of luminescence for Fast Neutrons and gamma-rays in the PP converter are presented as well as the comparison with the experimental results. The analytical results agree well with the experimental results.
K. Soyama - One of the best experts on this subject based on the ideXlab platform.
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Detection of Fast Neutron by Storage Phosphors With Low Gamma-Ray Sensitivity
IEEE Transactions on Nuclear Science, 2008Co-Authors: K. Sakasai, Y. Iwamoto, K. SoyamaAbstract:Storage phosphors such as SrBPO5:Eu2+ with low gamma-ray sensitivity were applied to Fast Neutron detection using polyethylene (PE) sheets as a proton generator that were set in front of the phosphors. The photostimulated luminescence (PSL) yields were measured by changing PE thickness when Neutron energy was 5 MeV. The experimental results were compared with those by Monte Carlo simulation using PHITS code. The PSL yields by gamma-ray associated with Fast Neutron fields were estimated for both SrBPO5:Eu2+ sheets and commercial available imaging plates. The results showed that the imaging methods using such storage phosphors with low gamma-ray sensitivity had negligible gamma-ray influences and will be used for Fast Neutron imaging.
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Fast Neutron detection by storage phosphors with low gamma-ray sensitivity
2007 IEEE Nuclear Science Symposium Conference Record, 2007Co-Authors: K. Sakasai, Y. Iwamoto, K. SoyamaAbstract:Storage phosphors such as SrBPOs:Eu2+ with low gamma-ray sensitivity were applied to Fast Neutron detection using polyethylene (PE) sheets as a proton generator that were set in front of the phosphors. The photostimulated luminescence (PSL) yields were measured by changing PE thickness when Neutron energy was 5 MeV. The experimental results were compared with those by Monte Carlo simulation using PHITS code. The PSL yields by gamma-ray associated with Fast Neutron fields were estimated for both SrBPOs:Eu2+ sheets and commercial available imaging plates. The results showed that the imaging methods using such storage phosphors with low gamma- ray sensitivity had negligible gamma-ray influences and will be used for Fast Neutron imaging.
U. Shirwadkar - One of the best experts on this subject based on the ideXlab platform.
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Fast Neutron measurements using cs 2 liycl 6 ce clyc scintillator
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment, 2015Co-Authors: M B Smith, Jarek Glodo, K S Shah, R Hawrami, T Achtzehn, H R Andrews, E T H Clifford, P Forget, P Odougherty, U. ShirwadkarAbstract:Abstract Samples of Cs 2 LiYCl 6 :Ce (CLYC) scintillator have been characterized using monoenergetic Neutron beams in the energy range 4.1–5.5 MeV. Four crystals with dimensions (thickness×diameter) of 1″×1″, 1″×2″, and 2″×2″ were evaluated, including one crystal with natural concentrations of Li isotopes and three that were enriched in 6 Li. The intrinsic efficiency of CLYC for Fast-Neutron detection has been determined for the natural-Li crystal. These measurements were translated into reaction cross-sections, and show good agreement with available cross-section data for Neutron interactions with the 35 Cl component of CLYC. Furthermore, it is shown that the charged-particle energy released in the Fast-Neutron reactions on 35 Cl varies linearly with the energy of the incoming Neutron. These results verify the efficacy of CLYC for Fast-Neutron spectroscopy in a range of applications.
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New generation plastic scintillators for Fast Neutron spectroscopy and Pulse Shape Discrimination
2013 IEEE Nuclear Science Symposium and Medical Imaging Conference (2013 NSS MIC), 2013Co-Authors: U. Shirwadkar, E.v.d. Van Loef, G. Markosyan, L. Soundara-pandian, V. Biteman, Simone Pozzi, A. Gueorguiev, Jarek Glodo, K S Shah, S. ClarkeAbstract:New generation of plastic scintillators have been developed at RMD for Fast Neutron detection technology. These plastics have peak emission wavelength ~ 440 nm, Fast scintillation decay
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Fast-Neutron detection and pulse shape discrimination with diphenylanthracene and tetraphenylbutadiene
2011 IEEE Nuclear Science Symposium Conference Record, 2011Co-Authors: E. V. Van Loef, U. Shirwadkar, K. Markosyan, S. Mukhopadhyay, N. Zaitseva, S. Payne, K S ShahAbstract:In this paper we report on Fast-Neutron detection and pulse shape discrimination with 9,10-diphenylanthracene and 1,1,4,4-tetraphenylbutadiene. Our research indicates that these organic scintillators have high light yields of up to 20,000 ph/MeV, a Fast scintillation decay of about 20 ns, very good Fast-Neutron detection, and excellent Neutron/gamma pulse shape discrimination.