International Journal for Radiation Physics and Chemistry最新文献_第2页

Radiation mechanisms—VI.(1) electron addition to tetrahedral phosphorus 辐射机理——六。(1)四面体磷的电子加成

International Journal for Radiation Physics and Chemistry Pub Date : 1976-01-01 DOI: 10.1016/0020-7055(76)90007-3

S. P. Mishra, M. Symons

引用次数: 3

On the mechanism for phosphate-mediated increase of Cl2− yield in irradiated, neutral chloride solution 磷酸盐介导辐照中性氯溶液中Cl2−产率增加的机理研究

International Journal for Radiation Physics and Chemistry Pub Date : 1976-01-01 Epub Date: 2002-10-09 DOI: 10.1016/0020-7055(76)90044-9

E. Wold, T. Brustad, M. Kongshaug

{"title":"On the mechanism for phosphate-mediated increase of Cl2− yield in irradiated, neutral chloride solution","authors":"E. Wold, T. Brustad, M. Kongshaug","doi":"10.1016/0020-7055(76)90044-9","DOIUrl":"10.1016/0020-7055(76)90044-9","url":null,"abstract":"<div>The effect of phosphate buffer components on the radiation induced oxidation of chloride to Cl2− is studied by pulse radiolysis. The yield of Cl2− in neutral phoshate-free 0.13 mol dm−3 NaCl solution is much lower than in the corresponding acidic solution (pH < 3), but increases rapidly with increasing chloride concentration. Addition of 0.2 mol dm−3 phosphate buffer (pH 6.8) to 0.13 mol dm−3 NaCl results in about a five-fold increased yield of Cl2− in N2-saturated solution, and about a 10-fold increase in N2O. At higher chloride concentrations, the total yield both in N2 and N2O is near that at pH 2 when G(Cl2−) is suggested to be equal to G(OH). The phosphate mediated enhancement of G(Cl2−) in neutral solution is suggested to be caused by a proton transfer from H2PO4− to the intermediate chloride oxidation product ClOH−. From the effect of H+ and phosphate on G(Cl2− we conclude that the rate of the proton donation is about 100 times slower than that for the direct reaction between protons and ClOH−.The results are discussed in the light of previously suggested mechanisms for radiation-induced oxidation of chloride.</div>","PeriodicalId":100688,"journal":{"name":"International Journal for Radiation Physics and Chemistry","volume":"8 6","pages":"Pages 699-705"},"PeriodicalIF":0.0,"publicationDate":"1976-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-7055(76)90044-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80661569","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

Molecular weight determination of irradiated polyisobutylene by N.M.R. techniques 核磁共振技术测定辐照聚异丁烯的分子量

International Journal for Radiation Physics and Chemistry Pub Date : 1976-01-01 Epub Date: 2002-10-09 DOI: 10.1016/0020-7055(76)90047-4

A. Charlesby, J. Steven

引用次数: 9

International conference on singlet oxygen and related species in chemistry and biology 单线态氧及其在化学和生物学中的相关物种国际会议

International Journal for Radiation Physics and Chemistry Pub Date : 1976-01-01 Epub Date: 2002-10-09 DOI: 10.1016/0020-7055(76)90050-4

J.H. Baxendale

引用次数: 4

γ-irradiation effects on the luminescence decay in benz(f)indan and anthracene doped fluorene single crystals γ辐照对苯并(f)吲哚和蒽掺杂芴单晶发光衰减的影响

International Journal for Radiation Physics and Chemistry Pub Date : 1976-01-01 Epub Date: 2002-10-09 DOI: 10.1016/0020-7055(76)90025-5

S. Dellonte, G. Orlandi, A. Breccia

引用次数: 0

Investigation of the effect of 60Co-γ radiation on single and polycrystalline polyethylene by broad line N.M.R. 60Co-γ辐射对单晶和多晶聚乙烯影响的宽线核磁共振研究

International Journal for Radiation Physics and Chemistry Pub Date : 1976-01-01 Epub Date: 2002-10-09 DOI: 10.1016/0020-7055(76)90013-9

S. Rafi Ahmad, A. Charleżsby

{"title":"Investigation of the effect of 60Co-γ radiation on single and polycrystalline polyethylene by broad line N.M.R.","authors":"S. Rafi Ahmad, A. Charleżsby","doi":"10.1016/0020-7055(76)90013-9","DOIUrl":"10.1016/0020-7055(76)90013-9","url":null,"abstract":"<div>The broad line N.M.R. spectra of irradiated and unirradiated high density bulk (HD) and single crystals (SC) of polyethylene were found to give rise to two components, e.g. broad and narrow lines, attributed to crystalline and amorphous regions, respectively. An increase in the line width of the narrow component with radiation dose is more marked in bulk HD specimens, and is ascribed to crosslinking in the radiation-sensitive amorphous region; whereas no such increase is apparent for the SC specimen. Though there seems to be a slight increase in the second moment of the total absorption curve with radiation up to about 200 Mrad, both the second moment and the line width of the broad component was found to decrease with radiation dose for both the samples. This indicates an increased chain mobility in the crystalline regions and is considered to be due to the destruction of regularity in the crystal lattices by the combined processes of crosslinking (or endlinking) in the amorphous regions and the formation of lattice defects and imperfections by the ionizing radiation. A relatively faster decrease of line width with radiation dose above about 1000 Mrad may be attributed to the predominance of the latter process at high doses.</div>","PeriodicalId":100688,"journal":{"name":"International Journal for Radiation Physics and Chemistry","volume":"8 4","pages":"Pages 497-501"},"PeriodicalIF":0.0,"publicationDate":"1976-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-7055(76)90013-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86049145","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

Pulse radiolysis experiments: Synthesis and analysis of composite spectra 脉冲辐射分解实验:复合光谱的合成与分析

International Journal for Radiation Physics and Chemistry Pub Date : 1976-01-01 Epub Date: 2002-10-09 DOI: 10.1016/0020-7055(76)90023-1

Robert H. Schuler, Gerald K. Buzzard

{"title":"Pulse radiolysis experiments: Synthesis and analysis of composite spectra","authors":"Robert H. Schuler, Gerald K. Buzzard","doi":"10.1016/0020-7055(76)90023-1","DOIUrl":"10.1016/0020-7055(76)90023-1","url":null,"abstract":"<div>Methods are outlined for compiling optical spectra obtained in pulse radiolysis experiments in a form suitable for detailed synthesis and analysis of composite spectra. The experimental data are processed with a programmable calculator having a cassette recorder for storage of the output data files and a peripheral plotter. The spectra are first smoothed by fitting them parabolically segment by segment. The overall spectrum is then assembled in digital form by interpolating the fitted data on a 1 nm grid and the results are stored on cassette files for further processing. Composite spectra can be readily calculated and plotted from the data on these files or known components can be subtracted from observed spectra to examine underlying contributions. The use of the fairly simple data processing methods described here permits an interactive mode of operation by the investigator which can maximize insight into details of the various contributions to an observed spectrum. Several examples of the use of these methods in conjunction with data obtained with a computer controlled pulse radiolysis data acquisition system are given.</div>","PeriodicalId":100688,"journal":{"name":"International Journal for Radiation Physics and Chemistry","volume":"8 5","pages":"Pages 563-574"},"PeriodicalIF":0.0,"publicationDate":"1976-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-7055(76)90023-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73896157","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 trigger generator to control a linear accelerator for pulse radiolysis 用于控制用于脉冲辐射分解的直线加速器的触发发生器

International Journal for Radiation Physics and Chemistry Pub Date : 1976-01-01 Epub Date: 2002-10-09 DOI: 10.1016/0020-7055(76)90079-6

B.W. Hodgson, J.P. Keene

引用次数: 1

Radiation mechanisms—VIII. Radiolysis of borohydride ions in aqueous solutions. An E.S.R. study 辐射mechanisms-VIII。硼氢化物离子在水溶液中的放射性溶解。一项esr研究

International Journal for Radiation Physics and Chemistry Pub Date : 1976-01-01 Epub Date: 2002-10-09 DOI: 10.1016/0020-7055(76)90085-1

Martyn C.R. Symons

引用次数: 2

The reaction of radiation-generated free radicals with cobalt(II) and cobalt(III) complexes containing macrocyclic ligands 辐射产生的自由基与含大环配体的钴(II)和钴(III)配合物的反应

International Journal for Radiation Physics and Chemistry Pub Date : 1976-01-01 Epub Date: 2002-10-09 DOI: 10.1016/0020-7055(76)90042-5

A. Martin Tait , Morton Z. Hoffman , E. Hayon

{"title":"The reaction of radiation-generated free radicals with cobalt(II) and cobalt(III) complexes containing macrocyclic ligands","authors":"A. Martin Tait , Morton Z. Hoffman , E. Hayon","doi":"10.1016/0020-7055(76)90042-5","DOIUrl":"10.1016/0020-7055(76)90042-5","url":null,"abstract":"<div>The reactions of radiation-generated free radicals with complexes of cobalt(III) and cobalt(II) containing the tetradentate 14-membered macrocyclic ligands 5,7,7,12,14,14 - hexamethyl - 1,4,8,11 - tetraazacyclotetradeca - 4,11 - diene (4,11 - dieneN4), 5,7,7,12,12,14 - hexamethyl - 1,4,8,11 - tetraazacyclotetradeca - 4,14 - diene (4,14 - dieneN4), and 2,3,9,10 - tetramethyl - 1,4,8,11 - tetraazacyclotetradeca - 1,3,8,10 - tetraene (1,3,8,10 - tetraeneN4) have been studied in aqueous solution using pulse radiolysis. The cobalt(III) complexes can be reduced to cobalt(II) by eaq−, CO2− and (CH3)2<math><mtext>Z.</mtext><mtext>̇</mtext></math>COH with the rate constants of the reactions depending upon the nature of the macrocycle and the axial ligand coordinated to the metal center. The rate constants and transient spectra arising from the reactions of the cobalt(II) species with H atoms, CH3 radicals, and Br2− radicals have also been determined.</div>","PeriodicalId":100688,"journal":{"name":"International Journal for Radiation Physics and Chemistry","volume":"8 6","pages":"Pages 691-696"},"PeriodicalIF":0.0,"publicationDate":"1976-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0020-7055(76)90042-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88554908","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: 11