Nuclear Instruments and Methods in Physics Research最新文献_第9页

Tilted multifoil techniques in pad studies of high spin reaction products 倾斜多箔技术在高自旋反应产物衬垫研究中的应用

Nuclear Instruments and Methods in Physics Research Pub Date : 1984-08-01 DOI: 10.1016/0167-5087(84)91334-6

C. Broude, E. Dafni , G. Goldring, M. Hass, O.C. Kistner , B. Rosenwasser, L. Sapir

引用次数: 6

A compact gridless channel plate detector for time-of-flight measurements 用于飞行时间测量的紧凑型无栅格通道板探测器

Nuclear Instruments and Methods in Physics Research Pub Date : 1984-08-01 DOI: 10.1016/0167-5087(84)91336-X

E.C. Pollacco , J.C. Jacmart, Y. Blumenfeld, Ph. Chomaz, N. Frascaria, J.P. Garron, J.C. Roynette

引用次数: 18

The Rutherford Appleton laboratory's mark I multiwire proportional counter positron camera 卢瑟福阿普尔顿实验室的mark I多线比例计数器正电子相机

Nuclear Instruments and Methods in Physics Research Pub Date : 1984-08-01 DOI: 10.1016/0167-5087(84)91359-0

J.E. Bateman, J.F. Connolly, R. Stephenson, G.J. Tappern, A.C. Flesher

{"title":"The Rutherford Appleton laboratory's mark I multiwire proportional counter positron camera","authors":"J.E. Bateman, J.F. Connolly, R. Stephenson, G.J. Tappern, A.C. Flesher","doi":"10.1016/0167-5087(84)91359-0","DOIUrl":"10.1016/0167-5087(84)91359-0","url":null,"abstract":"<div>A small (30 cm × 30 cm) model of a proposed large aperture positron camera has been developed at Rutherford Appleton Laboratory. Based on multiwire proportional counter technology it uses lead foil cathodes which function simultaneously as converters for the 511 keV gamma rays and readout electrodes for a delay line readout system. The detectors have been built up into a portable imaging system complete with a dedicated computer for data taking, processing and display. This has permitted evaluation of this type of positron imaging system in the clinical environment using both cyclotron generated isotopes (15O, 11C, 18F, 124I) and available isotopic generator systems (82Rb, 68Ga). At RAL we provided a complete hardware system and sufficient software to permit our hospital based colleagues to generate useful images with the minimum of effort. A complete description of the system is given with performance figures and some of the images obtained in three hospital visits are presented. Some detailed studies of the imaging performance of the positron camera are reported which have bearing on the design of future, improved systems.</div>","PeriodicalId":100972,"journal":{"name":"Nuclear Instruments and Methods in Physics Research","volume":"225 1","pages":"Pages 209-231"},"PeriodicalIF":0.0,"publicationDate":"1984-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0167-5087(84)91359-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77919038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 36

A detector system for discrete nuclide identification of ions with A ⩽ 60 一种用于识别A≤60离子的离散核素的探测器系统

Nuclear Instruments and Methods in Physics Research Pub Date : 1984-08-01 DOI: 10.1016/0167-5087(84)91338-3

K. Kwiatkowski, V.E. Viola Jr., W.G. Wilson, S.H. Zhou , H. Breuer

{"title":"A detector system for discrete nuclide identification of ions with A ⩽ 60","authors":"K. Kwiatkowski, V.E. Viola Jr., W.G. Wilson, S.H. Zhou , H. Breuer","doi":"10.1016/0167-5087(84)91338-3","DOIUrl":"10.1016/0167-5087(84)91338-3","url":null,"abstract":"<div>An x−y position-sensitive detector system which provides simultaneous mass and charge identification with discrete nuclide resolution is described. This system is specially suitable for low-energy, medium-mass (E1 ≈ 1–10 MeV/mu; A ≈ 10–60) heavy tons. Charge identification is determined from a two-element gas-ionization counter coupled with a semiconductor stop detector. The gas-ionization counter employs a simple electron drift time technique to obtain two-dimensional position information. Mass identification is derived from measurement of the fragment time-of-flight with a pair of channel-plate time devices and the fragment energy, as provided by the ΔEy – ΔEx – E telescope. This system yields mass and charge resolution ⩽0.7 units in both A and Z and gives position resolutioon <0.5 mm for fragments with A ≲60, as determined from measurements performed with a 7.2 MeV/u 56Fe beam incident on 238U.</div>","PeriodicalId":100972,"journal":{"name":"Nuclear Instruments and Methods in Physics Research","volume":"225 1","pages":"Pages 65-71"},"PeriodicalIF":0.0,"publicationDate":"1984-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0167-5087(84)91338-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84535537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

An automatic measuring system for particle tracks in plastic detectors 塑料探测器中微粒轨迹自动测量系统

Nuclear Instruments and Methods in Physics Research Pub Date : 1984-08-01 DOI: 10.1016/0167-5087(84)91342-5

W. Trakowski, B. Schöfer, J. Dreute, S. Sonntag, C. Brechtmann, J. Beer, H. Drechsel, W. Heinrich

引用次数: 45

A general purpose code for Monte Carlo simulations 蒙特卡罗模拟的通用代码

Nuclear Instruments and Methods in Physics Research Pub Date : 1984-08-01 DOI: 10.1016/0167-5087(84)91349-8

Winfried W. Wilcke

引用次数: 1

Study of limited streamer drift tube performance 限流漂移管性能研究

Nuclear Instruments and Methods in Physics Research Pub Date : 1984-08-01 DOI: 10.1016/0167-5087(84)91333-4

K. Fujii, J. Fujimoto, H. Hayashii, R. Kajikawa, Y. Masatani, H. Ozaki, A. Sugiyama, R. Suzaki, S. Suzuki, T.Y. Tsukamoto, T.F. Tsukamoto, S. Uno, S. Iwata, H. Okuno

引用次数: 16

Deconvolution 反褶积

Nuclear Instruments and Methods in Physics Research Pub Date : 1984-08-01 DOI: 10.1016/0167-5087(84)91348-6

J. Law , M.C. Jones

引用次数: 0

An empirical correction for dead-time and pulse pile-up losses in gamma-ray spectrometry 伽玛射线能谱中死区时间和脉冲堆积损失的经验校正

Nuclear Instruments and Methods in Physics Research Pub Date : 1984-08-01 DOI: 10.1016/0167-5087(84)91347-4

Muyoba Macwani

引用次数: 1

New fast organic scintillators using intramolecular bromine quenching 分子内溴猝灭的新型快速有机闪烁体

Nuclear Instruments and Methods in Physics Research Pub Date : 1984-08-01 DOI: 10.1016/0167-5087(84)91340-1

I.B. Berlman , S.S. Lutz, J.M. Flournoy, C.B. Ashford, L.A. Franks, P.B. Lyons

{"title":"New fast organic scintillators using intramolecular bromine quenching","authors":"I.B. Berlman , S.S. Lutz, J.M. Flournoy, C.B. Ashford, L.A. Franks, P.B. Lyons","doi":"10.1016/0167-5087(84)91340-1","DOIUrl":"10.1016/0167-5087(84)91340-1","url":null,"abstract":"<div>Organic scintillator solutions with decay times as fast as 500 ps and with relatively high conversion efficiencies have been developed. The intramolecular quenching was achieved through the novel approach of adding a bromine atom to the 3- or 4-position of para-oligophenylenes, the fluorescent solutes in these binary solutions. The bromine serves to enhance singlet-to-triplet intersystem crossing in the chromophore, causing a reduction in the scintillation yield and a conconitant reduction in the decay time. The very fast value given above probably also involves some intermolecular self-quenching at high concentration. In addition, the bromine reduces the symmetry of the molecules, thereby increasing their solubility. Finally, an alkyl chain on the opposite para position further increases the solubility and also increases the immunity of the chromophore to quenching.The following solutes were studied in binary liquid solutions and to a limited extent in plastics: 4-bromo-4″-(5-hexadecyl)-p-terphenyl: (4-BHTP), 3-bromo-4″-(5-hexadecyl)-p-terphenyl: (3-BHTP), 4-bromo-p-terphenyl: (4-BTP), 3-bromo-p-terphenyl: (3-BTP), 4-bromo-4‴-(5-hexadecyl)-p-quaterphenyl: (4-BHQP). The decay times for binary liquid solutions in toluene (at the indicated concentrations) were 0.51 ns for 4-BHTP (0.14 M), 0.75 ns for 3-BHTP (0.14 M), 0.57 ns for 3-BTP (0.14 M), and 1.3 ns for 4-BHQP (0.06 M). Binary plastics with 4-BHTP as the solute in concentrations up to 0.14 M were cast in polystyrene. The shortest decay time, 0.40 ns, was measured for the 0.14 M concentration. A plastic scintillator containing 3-BTP (0.11 M in polystyrene) had a decay time of 0.85 ns. These results compare favorably with the plastic scintillator BC-422 whose decay time is about 1.4 ns.</div>","PeriodicalId":100972,"journal":{"name":"Nuclear Instruments and Methods in Physics Research","volume":"225 1","pages":"Pages 78-82"},"PeriodicalIF":0.0,"publicationDate":"1984-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0167-5087(84)91340-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81570461","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4