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International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry最新文献

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Thermalization of low energy electrons in hydrocarbon matrices 碳氢化合物基质中低能电子的热化
International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-12-01 Epub Date: 2002-10-09 DOI: 10.1016/1359-0197(92)90225-5
L.V. Lukin
{"title":"Thermalization of low energy electrons in hydrocarbon matrices","authors":"L.V. Lukin","doi":"10.1016/1359-0197(92)90225-5","DOIUrl":"10.1016/1359-0197(92)90225-5","url":null,"abstract":"<div><p>The experimental thermalization lengths, <em>l</em><sub>th</sub>, for hot electrons e<sup>-</sup><sub>hot</sub> produced by photoionization of solvated electrons in 3-methylpentane glass are discussed. For electron energies ranging from the initial value <em>E</em><sub>0</sub>&gt;1 eV down to 0.1–0.2 eV, the electron e<sup>-</sup><sub>hot</sub> is assumed to loss energy mainly due to excitation of intramolecular vibrations with energy losses σ<em>E</em>&gt;<em>k</em><sub>B</sub><em>T</em>. It is concluded that this model is in agreement with experimental data on <em>l</em><sub>th</sub>. The spatial distribution of subvibrational electrons is obtained.</p></div>","PeriodicalId":14262,"journal":{"name":"International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry","volume":"40 6","pages":"Pages 565-573"},"PeriodicalIF":0.0,"publicationDate":"1992-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/1359-0197(92)90225-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77577515","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: 1
Reactions of 1, 1-diphenyl-2-picryl-hydrazyl with NO2, Cl2 and F2 1,1 -二苯基-2-苦酰肼与NO2、Cl2和F2的反应
International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-12-01 Epub Date: 2002-10-09 DOI: 10.1016/1359-0197(92)90210-7
L. Gille, U. Prösch, R. Stoesser
{"title":"Reactions of 1, 1-diphenyl-2-picryl-hydrazyl with NO2, Cl2 and F2","authors":"L. Gille,&nbsp;U. Prösch,&nbsp;R. Stoesser","doi":"10.1016/1359-0197(92)90210-7","DOIUrl":"10.1016/1359-0197(92)90210-7","url":null,"abstract":"<div><p>The reactions of DPPH with Cl<sub>2</sub>, NO<sub>2</sub> and F<sub>2</sub> were studied. In the <em>para</em>-phenyl position substituted diphenylpicrylhydrazines were formed. Besides this, the reaction of halogens led to products which were nitro-substituted in the <em>para</em>-phenyl position. Thus, it was shown that the reactions of halogens and halogen radicals with DPPH include a substitution at the picryl group of DPPH and its derivatives under liberation of NO<sub>2</sub>.</p><p>By ESR <em>in situ</em> spectroscopy and computational analysis of spectra, nitro-, dinitro-, fluoro- and difluoro-diphenylpicrylhydrazyls were identified as transient intermediates. In the formation of these species nitrogen dioxide and fluorine act as oxidants for the corresponding substituted hydrazines.</p></div>","PeriodicalId":14262,"journal":{"name":"International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry","volume":"40 6","pages":"Pages 461-468"},"PeriodicalIF":0.0,"publicationDate":"1992-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/1359-0197(92)90210-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82506927","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
Effect of gamma-irradiation on catalytic activity and selectivity of CuO-Al2O3 solids γ辐照对CuO-Al2O3固体催化活性和选择性的影响
International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-12-01 Epub Date: 2002-10-09 DOI: 10.1016/1359-0197(92)90226-6
A.M. Youssef, S.A. El-Hakam, G.A. El-Shobaky
{"title":"Effect of gamma-irradiation on catalytic activity and selectivity of CuO-Al2O3 solids","authors":"A.M. Youssef,&nbsp;S.A. El-Hakam,&nbsp;G.A. El-Shobaky","doi":"10.1016/1359-0197(92)90226-6","DOIUrl":"10.1016/1359-0197(92)90226-6","url":null,"abstract":"<div><p>CuO-Al<sub>2</sub>O<sub>3</sub> catalyst containing 16.2 wt% CuO, precalcined at 300°C was subjected to different doses of γ-rays ranging between 20 and 160 Mrad. The magnetic properties were measured by the Gouy method and the catalytic activity and selectivity towards isopropanol conversion were investigated using a microcatalytic pulse technique at temperatures between 260–300°C.</p><p>The CuO-Al<sub>2</sub>O<sub>3</sub> system exhibited a lower paramagnetic moment compared to that of unloaded CuO. γ-Irradiation induced changes in the magnetic properties of the system. The presence of diamagnetic alumina as a support and its dehydroxylation with γ-rays contributed to the observed changes in the magnetic properties.</p><p>Loading of CuO on alumina decreased the dehydration activity which disappeared completely at 16.2 wt% CuO. γ-Irradiation resulted in a progressive decrease in the dehydrogenation activity falling to a minimum at a dose of 40 Mrad. At greater doses the activity increased with the increase of the irradiation dose. Unirradiated and 160 Mrad-irradiated samples measured more or less the same dehydrogenation activity.</p></div>","PeriodicalId":14262,"journal":{"name":"International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry","volume":"40 6","pages":"Pages 575-578"},"PeriodicalIF":0.0,"publicationDate":"1992-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/1359-0197(92)90226-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77335522","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: 3
Radiation effects on crystalline polymers—I. Gamma-radiation-induced crosslinking and structural characterization of polyethylene oxide 辐射对结晶聚合物的影响。聚乙烯氧化物的γ辐射诱导交联及结构表征
International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-12-01 Epub Date: 2002-10-09 DOI: 10.1016/1359-0197(92)90215-2
Lihua Zhang, Wende Zhang, Zicheng Zhang, Li Yu, Hongfang Zhang, Yuchen Qi, Donglin Chen
{"title":"Radiation effects on crystalline polymers—I. Gamma-radiation-induced crosslinking and structural characterization of polyethylene oxide","authors":"Lihua Zhang,&nbsp;Wende Zhang,&nbsp;Zicheng Zhang,&nbsp;Li Yu,&nbsp;Hongfang Zhang,&nbsp;Yuchen Qi,&nbsp;Donglin Chen","doi":"10.1016/1359-0197(92)90215-2","DOIUrl":"10.1016/1359-0197(92)90215-2","url":null,"abstract":"<div><p>By using WAXD, DSC and gel fraction determination techniques, the mechanism of radiation crosslinking of polyethylene oxide (PEO) was explored, and the dependence of aggregated state on the chemical reaction and physical structure was also discussed. It was found that just like other semi-crystalline polymers, the state of aggregation of the specimen has a profound influence on the radiation effects on PEO. On the contrary, the crystalline structure of the specimen is severely affected with the increase in radiation dose and eventually amorphortized when subjected to an extremely high radiation dose.</p></div>","PeriodicalId":14262,"journal":{"name":"International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry","volume":"40 6","pages":"Pages 501-505"},"PeriodicalIF":0.0,"publicationDate":"1992-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/1359-0197(92)90215-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73202766","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: 17
Establishment of Fricke dosimetry methodology 弗里克剂量法的建立
International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-12-01 Epub Date: 2002-10-09 DOI: 10.1016/1359-0197(92)90231-4
J.Fernández Miranda , S.Vizoso Garcia
{"title":"Establishment of Fricke dosimetry methodology","authors":"J.Fernández Miranda ,&nbsp;S.Vizoso Garcia","doi":"10.1016/1359-0197(92)90231-4","DOIUrl":"10.1016/1359-0197(92)90231-4","url":null,"abstract":"","PeriodicalId":14262,"journal":{"name":"International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry","volume":"40 6","pages":"Pages 597-598"},"PeriodicalIF":0.0,"publicationDate":"1992-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/1359-0197(92)90231-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85654699","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: 0
The physical and chemical effects of ionizing radiation on polyethylene containing a phenolic scavenger and/or other additives 电离辐射对含酚类清除剂和/或其他添加剂的聚乙烯的物理和化学影响
International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-12-01 Epub Date: 2002-10-09 DOI: 10.1016/1359-0197(92)90214-Z
Bernard J. Lyons
{"title":"The physical and chemical effects of ionizing radiation on polyethylene containing a phenolic scavenger and/or other additives","authors":"Bernard J. Lyons","doi":"10.1016/1359-0197(92)90214-Z","DOIUrl":"10.1016/1359-0197(92)90214-Z","url":null,"abstract":"<div><p>This paper describes the effect of an antioxidant, a monomer and fillers (silica or carbon black), alone or in certain combinations with each other, on the mechanical and chemical response of a low density polyethylene (and, more briefly, that of other polyethylenes), to exposure to ionizing radiation. It is shown that, if chain scission is a significant factor in the radiolysis of a polymer, then the inter-relations between sol fraction, elastic modulus and ultimate elongation (both at 160°C) should change depending on whether an additive inhibits or enhances crosslinking. It was found that such additives do not significantly or consistently alter the inter-relations between these properties in polyethylene, indicating that chain scission is not an important feature of the radiolysis of this polymer.</p></div>","PeriodicalId":14262,"journal":{"name":"International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry","volume":"40 6","pages":"Pages 489-499"},"PeriodicalIF":0.0,"publicationDate":"1992-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/1359-0197(92)90214-Z","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73853900","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: 6
Thermal electron mobilities in low density gaseous mixtures 低密度气体混合物中的热电子迁移率
International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-12-01 Epub Date: 2002-10-09 DOI: 10.1016/1359-0197(92)90222-2
O.W. Dmitriev, W. Tchórzewska, I. Szamrej, M. Foryś
{"title":"Thermal electron mobilities in low density gaseous mixtures","authors":"O.W. Dmitriev,&nbsp;W. Tchórzewska,&nbsp;I. Szamrej,&nbsp;M. Foryś","doi":"10.1016/1359-0197(92)90222-2","DOIUrl":"10.1016/1359-0197(92)90222-2","url":null,"abstract":"<div><p>A new method of obtaining thermal electron mobilities from experimental dependencies observed in the electron swarm is described; the method is suitable for both electron accepting and non-accepting systems. The electron mobilities for CO<sub>2</sub>, CH<sub>4</sub>, C<sub>2</sub>H<sub>6</sub> as well as for N<sub>2</sub>, Ar, Xe, Kr and their mixtures with carbon dioxide are obtained.</p></div>","PeriodicalId":14262,"journal":{"name":"International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry","volume":"40 6","pages":"Pages 547-550"},"PeriodicalIF":0.0,"publicationDate":"1992-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/1359-0197(92)90222-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77886207","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: 1
Instrumentation of kinetic spectroscopy—10. A modular data acquisition system for laser flash photolysis and pulse radiolysis experiments 动力学光谱仪器- 10。一种用于激光闪光光解和脉冲辐射解实验的模块化数据采集系统
International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-12-01 Epub Date: 2002-10-09 DOI: 10.1016/1359-0197(92)90207-V
E. Janata
{"title":"Instrumentation of kinetic spectroscopy—10. A modular data acquisition system for laser flash photolysis and pulse radiolysis experiments","authors":"E. Janata","doi":"10.1016/1359-0197(92)90207-V","DOIUrl":"10.1016/1359-0197(92)90207-V","url":null,"abstract":"<div><p>A modular instrumental system for processing transient signals in laser flash photolysis and pulse radiolysis experiments is described. Modules with fast time-response and terminated interconnections allow signal capturing over a large time range, from nanoseconds to infinity, through the use of various kinds of detectors. A standard data bus is used to connect this system to the computer.</p></div>","PeriodicalId":14262,"journal":{"name":"International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry","volume":"40 6","pages":"Pages 437-443"},"PeriodicalIF":0.0,"publicationDate":"1992-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/1359-0197(92)90207-V","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84945157","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: 21
Electron spin resonance of sulfite radicals in irradiated calcite and aragonite 辐照方解石和文石中亚硫酸盐自由基的电子自旋共振
International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-12-01 Epub Date: 2002-10-09 DOI: 10.1016/1359-0197(92)90211-W
Ayako Kai, Toshikatsu Miki
{"title":"Electron spin resonance of sulfite radicals in irradiated calcite and aragonite","authors":"Ayako Kai,&nbsp;Toshikatsu Miki","doi":"10.1016/1359-0197(92)90211-W","DOIUrl":"10.1016/1359-0197(92)90211-W","url":null,"abstract":"<div><p>Radiation-induced radicals in sulfite-doped calcite and aragonite were characterized by ESR. Among the many ESR signals produced, only four signals are dependent on the SO<sup>2-</sup><sub>3</sub> concentration; an axial signal (<em>g</em><sub>⊥</sub>=2.0038 and <em>g</em>|=2.0024) in calcite, and an orthorhombic signal (<em>g</em><sub>1</sub>=2.0042, <em>g</em><sub>2=2.0038</sub> and <em>g</em><sub>3</sub>=2.0025), an isotropic signal (<em>g</em>=2.0034) and an isotropic signal (<em>g</em>=2.0060) in aragonite. The former two signals exhibit hyperfine structures arising from <sup>33<em>S</em></sup><span><math><mtext>(I=</mtext><mtext>3</mtext><mtext>2</mtext><mtext>, 0.75%</mtext></math></span> natural abundance), and are attributed to SO<sup>-</sup><sub>3</sub> radicals. The isotropic signal at <em>g</em>=2.0034 in aragonite is considered to be due to rotating SO<sup>-</sup><sub>3</sub> radicals. Rotating or tumbling molecules (probably SO<sup>-</sup><sub>2</sub>) produced by thermal decomposition of SO<sup>2-</sup><sub>3</sub> seem to be responsible for the isotropic signal at <em>f=2.0060</em>.</p></div>","PeriodicalId":14262,"journal":{"name":"International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry","volume":"40 6","pages":"Pages 469-476"},"PeriodicalIF":0.0,"publicationDate":"1992-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/1359-0197(92)90211-W","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91551254","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: 32
Analytic electron impact inelastic cross sections for water vapor and a study of energy deposition 水蒸气的解析电子冲击非弹性截面及能量沉积研究
International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-12-01 Epub Date: 2002-10-09 DOI: 10.1016/1359-0197(92)90219-6
Dayashankar , A.E.S. Green
{"title":"Analytic electron impact inelastic cross sections for water vapor and a study of energy deposition","authors":"Dayashankar ,&nbsp;A.E.S. Green","doi":"10.1016/1359-0197(92)90219-6","DOIUrl":"10.1016/1359-0197(92)90219-6","url":null,"abstract":"<div><p>Electron impact cross sections for various electronic excited states and for ionization of water vapor are represented by analytic forms that cover non-relativistic as well as relativistic energy region. This inelastic cross section set may serve as a convenient input for electron transport calculations relevant in several fields. With this cross section input an electron energy deposition study has been carried out using a Monte Carlo simulation giving excitation and ionization yields, the Fano factor and the subexcitation spectra for initial energies up to 1 MeV.</p></div>","PeriodicalId":14262,"journal":{"name":"International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry","volume":"40 6","pages":"Pages 523-528"},"PeriodicalIF":0.0,"publicationDate":"1992-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/1359-0197(92)90219-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76133605","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
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