International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry最新文献_第4页

Primary processes induced in polyethylene film by electron beam irradiation at low and very low temperatures 低温和极低温下电子束辐照聚乙烯薄膜所引起的初级过程

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-11-01 DOI: 10.1016/1359-0197(92)90201-P

J. Kroh , S. Wysocki

引用次数: 0

ESR study of the direct radiolysis of DNA, DNA-histones and DNA-intercalators complexes 直接放射溶解DNA、DNA-组蛋白和DNA-插入物复合物的ESR研究

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-11-01 DOI: 10.1016/1359-0197(92)90195-L

A. Faucitano, A. Buttafava, F. Martinotti, G. Pedraly‐Noy

引用次数: 13

High dose neutron and gamma-radiation effects in an epoxy resin 环氧树脂的高剂量中子和γ辐射效应

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-11-01 DOI: 10.1016/1359-0197(92)90203-R

A. Al-Attabi , R.A. Fouracre , H.M. Banford , D.J. Tedford

引用次数: 9

Theoretical models for electron conduction in polymer systems—II. Tunnelling coupled with guided diffusion as a mechanism of electron transport in the conducting polymer systems 聚合物系统中电子传导的理论模型- ii。在导电聚合物体系中，隧穿与引导扩散耦合是一种电子传递机制

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-11-01 DOI: 10.1016/1359-0197(92)90198-O

Witold M. Bartczak, Jerzy Kroh

{"title":"Theoretical models for electron conduction in polymer systems—II. Tunnelling coupled with guided diffusion as a mechanism of electron transport in the conducting polymer systems","authors":"Witold M. Bartczak, Jerzy Kroh","doi":"10.1016/1359-0197(92)90198-O","DOIUrl":"10.1016/1359-0197(92)90198-O","url":null,"abstract":"<div>A mechanism is proposed for electron transport in inhomogeneous systems in which the dimensionality of space where diffusion or hopping takes place can be reduced. Instead of bringing an electron to a small target (physical trap or a localized hole) by probing three-dimensional space the mechanism reduces the process to a sequence of fast processes in one- or two-dimensional subspaces.The model is applicable to the inhomogeneous media of fibre-like structures. We assume that the mobile charge carriers occupy the quasi one-dimensional, conducting polymers. The polymer fibres are separated by the non-conducting regions which are accessible for electrons only by quantum-mechanical tunnelling. The three-dimensional tunnelling of the electron to its target is thus reduced to the fast one-dimensional diffusion along the polymer chain coupled with the two-dimensional tunnelling from the polymer to the target.This mechanism was assumed as a basis for theoretical calculations in two cases. The first case corresponds to the electron reaction with homogeneously-distributed physical traps. The expressions for the trapping rate constant and the electron survival probability as functions of time were derived. The second application of the model provides the description of the electron-hole recombination in pulse-irradiated columnar aggregates of peripherally octa-n-alkoxy-substituted phthalocyanines. The charge recombination occurs via intercolumnar electron tunnelling through the hydrocarbon mantle coupled with free movement of charge carriers along the phthalocyanine cores of the columns. The carrier survival probability was calculated as a function of time.</div>","PeriodicalId":14262,"journal":{"name":"International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry","volume":"40 5","pages":"Pages 377-381"},"PeriodicalIF":0.0,"publicationDate":"1992-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/1359-0197(92)90198-O","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89628435","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

Effects of gamma-radiation on the polymer electrolyte P(EO)8·LiClO4 γ辐射对聚合物电解质P(EO)8·LiClO4的影响

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-11-01 DOI: 10.1016/1359-0197(92)90196-M

P. Ferloni , A. Magistris, G. Chiodelli , A. Faucitano , A. Buttafava

引用次数: 1

ESR study of the direct radiolysis of DNA, DNA-histones and DNA-intercalators complexes 直接放射溶解DNA、DNA-组蛋白和DNA-插入物复合物的ESR研究

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-11-01 DOI: 10.1016/1359-0197(92)90195-L

A. Faucitano , A. Buttafava , F. Martinotti , G. Pedraly-Noy

引用次数: 13

The mechanism of gamma-radiolysis of polymethylene, polypropylene and poly-n-butylene oxides: An ESR investigation 聚亚甲基、聚丙烯和聚正丁烯氧化物的γ -辐射分解机理:ESR研究

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-11-01 DOI: 10.1016/1359-0197(92)90194-K

A. Faucitano, A. Buttafava, F. Martinotti, P. Ferloni, A. Magistris

引用次数: 8

Excited state formation in irradiated polyethylene in the presence of aromatic admixtures at low temperature 低温下辐照聚乙烯中芳香族外加剂的激发态形成

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-11-01 DOI: 10.1016/1359-0197(92)90199-P

M. Szadkowska-Nicze, J. Mayer, J. Kroh

引用次数: 4

Theoretical models for electron conduction in polymer systems—I. Macroscopic calculations of d.c. transient conductivity after pulse irradiation 聚合物体系中电子传导的理论模型- 1。脉冲辐照后直流瞬态电导率的宏观计算

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-11-01 DOI: 10.1016/1359-0197(92)90197-N

Witold M. Bartczak, Jerzy Kroh

{"title":"Theoretical models for electron conduction in polymer systems—I. Macroscopic calculations of d.c. transient conductivity after pulse irradiation","authors":"Witold M. Bartczak, Jerzy Kroh","doi":"10.1016/1359-0197(92)90197-N","DOIUrl":"10.1016/1359-0197(92)90197-N","url":null,"abstract":"<div>The simulation of the transient d.c. conductivity in a quasi one-dimensional system of charges produced by a pulse of ionizing radiation in a solid sample has been performed. The simulation is based on the macroscopic conductivity equations and can provide physical insight into d.c. conductivity measurements, particularly for the case of transient currents in samples with internal space charge.We consider the system of mobile (negative) and immobile (positive) charges produced by a pulse of ionizing radiation in the sample under a fixed external voltage V0. The presence of space charge results in an electric field which is a function of both the spatial and the time variable: E(z, t). Given the space charge density, the electric field can be calculated from the Poisson equation. However, for an arbitrary space charge distribution, the corresponding equations can only be solved numerically.The two non-trivial cases for which approximate analytical solutions can be provided are: <ul><li>1.(i) The density of the current carriers n(z, t) is negligible in comparison with the density of immobile space charge N(z). A general analytical solution has been found for this case using Green's functions. The solutions for two cases, viz. the homogeneous distribution of space charge N(z) = N, and the non-homogeneous exponential distribution N(z) = A exp(-Bz), have been separately discussed.</li><li>2.(ii) The space charge created in the pulse without any space charge present prior to the irradiation.</li></ul></div>","PeriodicalId":14262,"journal":{"name":"International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry","volume":"40 5","pages":"Pages 369-376"},"PeriodicalIF":0.0,"publicationDate":"1992-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/1359-0197(92)90197-N","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76946978","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

Electrical conduction in irradiated low-density polyethylene 辐照低密度聚乙烯的导电性

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-11-01 DOI: 10.1016/1359-0197(92)90202-Q

H.M. Banford , R.A. Fouracre , G. Chen , D.J. Tedford

{"title":"Electrical conduction in irradiated low-density polyethylene","authors":"H.M. Banford , R.A. Fouracre , G. Chen , D.J. Tedford","doi":"10.1016/1359-0197(92)90202-Q","DOIUrl":"10.1016/1359-0197(92)90202-Q","url":null,"abstract":"<div>A programme of experiments has been undertaken to examine transient charging/discharging currents and steady state currents in low-density polyethylene (LDPE) under the application of direct fields. This has been undertaken for pristine material and for material which has received doses of radiation between 104 and 106 Gy from either a 60Co γ-source or a research reactor. The material was irradiated in ambient air or dry nitrogen. Measurements were made for applied fields in the range 6.7 × 105-5.3 × 107 V m -1 and temperatures between ambient and 90°C. With pristine material at low fields, transient charging/discharging currents decreased monotonically with time. However, the mechanism changed at higher fields with a peak occurring in the charging transient indicating a space-charge limited process. Substantial charge injection was also in evidence as demonstrated by anomalous discharging currents. This transient response was echoed by the current/voltage characteristics of steady state behaviour. Gamma and neutron irradiation brought about a change in this situation and the charge transport mechanism altered gradually from space-charge-limited conduction to an ohmic process with increasing dose. The role played by charge traps appears to be significant.</div>","PeriodicalId":14262,"journal":{"name":"International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry","volume":"40 5","pages":"Pages 401-410"},"PeriodicalIF":0.0,"publicationDate":"1992-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/1359-0197(92)90202-Q","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73612189","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: 10