International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry最新文献_第10页

A simple method for identification of irradiated spices 一种辐照香料的简易鉴别方法

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-07-01 DOI: 10.1016/1359-0197(92)90135-3

Arun Behere, S.R.Padwal Desai, S.M.D. Rao, P.M. Nair

引用次数: 3

Effect of urea on the mechanical strength of wood-plastic composites 尿素对木塑复合材料机械强度的影响

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-07-01 DOI: 10.1016/1359-0197(92)90142-3

Mubarak A. Khan, K.M.Idriss Ali

引用次数: 9

Effect of iron(III) sulphate on radiation-induced reduction of methyl viologen incorporated in poly(vinyl alcohol) film 硫酸铁(III)对聚乙烯醇膜中甲基紫素辐射还原的影响

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-07-01 DOI: 10.1016/1359-0197(92)90139-7

Bunsho Ohtani, Mu Ye, Sei-Ichi Nishimoto, Tsutomu Kagiya

{"title":"Effect of iron(III) sulphate on radiation-induced reduction of methyl viologen incorporated in poly(vinyl alcohol) film","authors":"Bunsho Ohtani, Mu Ye, Sei-Ichi Nishimoto, Tsutomu Kagiya","doi":"10.1016/1359-0197(92)90139-7","DOIUrl":"10.1016/1359-0197(92)90139-7","url":null,"abstract":"<div>Addition of iron(III) sulfate (Fe2(SO4)3) to the methyl viologen (MV2+)-poly(vinyl alcohol) (PVA) film dosimeter led to the induction dose (Di) before appearance of blue-colored cation radical (MV+.) and reduction of G-value of MV+.. As a result, the measurable range for ionizing radiation (200 kV electron beam) was expanded to the higher dose >400 kGy, which was >25 times larger than that of base MV2+-PVA film (<14 kGy). In the MV2+-Fe2(SO4)3-PVA film, iron(II) ion (Fe2+) was also accumulated without any induction dose. The Fe2+ still increased after Di, with the G-value relatively smaller than that before Di. Increase in pH ((pH)i) of the source aqueous PVA solution, subjected to casting into films, led to the decrease in Di and increase in G-value of MV+. (G(MV+.)). The ratio of initial concentration of Fe3+ ((CFe)i) to Di was apparently independent of (CFe)i at given (pH)i. These results suggest the mechanism that radiation-induced electrons in the PVA matrix reduce both MV2+ and Fe3+, and the resulting MV+. successively reacts with neighboring Fe3+ to regenerate MV2+ in the initial stage of irradiation (within Di). At the dose of Di, such neighboring Fe3+ is consumed entirely and substantial formation of MV+. can be observed.</div>","PeriodicalId":14262,"journal":{"name":"International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry","volume":"40 1","pages":"Pages 49-53"},"PeriodicalIF":0.0,"publicationDate":"1992-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/1359-0197(92)90139-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73659239","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

EPR-detection of the guanosyl radical cation in aqueous solution. Quantum chemically supported assignment of nitrogen and proton hyperfine couplings 水溶液中鸟腈基阳离子的epr检测。量子化学支持氮和质子超精细偶联的分配

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-07-01 DOI: 10.1016/1359-0197(92)90141-2

Vinzenz Bachler, Knut Hildenbrand

{"title":"EPR-detection of the guanosyl radical cation in aqueous solution. Quantum chemically supported assignment of nitrogen and proton hyperfine couplings","authors":"Vinzenz Bachler, Knut Hildenbrand","doi":"10.1016/1359-0197(92)90141-2","DOIUrl":"10.1016/1359-0197(92)90141-2","url":null,"abstract":"<div>In situ photolysis of aqueous solutions containing either 2&#x0301;-deoxyguanosine-5&#x0301;-phosphate or guanosine-2&#x0301;-phosphate and K2S2O8 at pH<4 resulted in a resolved EPR-spectrum consisting of 40 equidistant peaks with a separation of 0.068 mT centered at g=2.0038. It originates from the guanosyl radical cation generated upon one-electron oxidation of the base moiety by SO-•4. In order to assist the assignment of the EPR-spectrum theoretical nitrogen and hydrogen hyperfine coupling constants were employed. They were obtained from spin density calculations based on the restricted open shell formalism at an ab initio level. For a conversion of calculated spin densities into coupling constants, calibration curves were constructed by applying a McConnell type approach to known nitrogen heterocyclic radical cations. For four different tautomers of the guanosyl radical cation theoretical spin densities and calibration curves were used to obtain coupling constants. They were applied in a simulation of the experimental EPR-spectrum. The simulation in combination with the calculated energies of the tautomers indicate that the EPR-spectrum originates from the guanosyl radical cation protonated at NI.</div>","PeriodicalId":14262,"journal":{"name":"International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry","volume":"40 1","pages":"Pages 59-68"},"PeriodicalIF":0.0,"publicationDate":"1992-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/1359-0197(92)90141-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76249049","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: 7

Mathematical simulation of the kinetics of radiation induced hydroxyalkylation of aliphatic saturated alcohols 辐射诱导脂肪族饱和醇羟基烷基化动力学的数学模拟

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-07-01 DOI: 10.1016/1359-0197(92)90131-X

M.M. Silaev, L.T. Bugaenko

{"title":"Mathematical simulation of the kinetics of radiation induced hydroxyalkylation of aliphatic saturated alcohols","authors":"M.M. Silaev, L.T. Bugaenko","doi":"10.1016/1359-0197(92)90131-X","DOIUrl":"10.1016/1359-0197(92)90131-X","url":null,"abstract":"<div>The paper reports on the development of the kinetics of radiation hydroxymethylation and hydroxypropylation chain processes relating to aliphatic saturated alcohols in the γ-radiolysis of the alcohol-unsaturated compound systems to give 1,2- and 1,4-diols respectively. These processes were simulated mathematically. The kinetic curves computed are in good agreement with the experimental dependences. The kinetic parameters of the processes, including the rate constants for the addition of α-hydroxyalkyl radicals from the saturated alcohols to the double bond of the unsaturated component, viz. formaldehyde or 2-propene-1-ol in the systems, were estimated. The constants (in dm3/mol·s) for the saturated alcohol-formaldehyde systems incorporating ethanol as the saturated alcohol were found to be (1.5±0.3)·104 at 413 K and (2.1±0.5)·104 at 443 K; incorporating 1-propanol-(6.0±1.3)·103 at 413 K; for the saturated alcohol-2-propene-1-ol systems incorporating methanol, ethanol, 1- and 2-propanol-(2.5±0.3) ·104, (6.5±0.9)·104, (2.7±0.4)·104 and (1.0±0.1)·105, respectively, at 433 K.</div>","PeriodicalId":14262,"journal":{"name":"International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry","volume":"40 1","pages":"Pages 1-10"},"PeriodicalIF":0.0,"publicationDate":"1992-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/1359-0197(92)90131-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83248289","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: 48

Miller conference on radiation chemistry 米勒辐射化学会议

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-07-01 DOI: 10.1016/1359-0197(92)90146-7

引用次数: 0

High dose dosimetry for radiation processing: Proceedings of an international symposium, Vienna, 5–9 November, 1990 辐射加工的高剂量剂量学:1990年11月5日至9日维也纳国际专题讨论会论文集

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-07-01 DOI: 10.1016/1359-0197(92)90145-6

A. Charlesby

引用次数: 0

Low energy electron localization in hydrocarbon glasses. Method of photoassisted ion pair separation 碳氢玻璃中的低能电子定位。光辅助离子对分离方法

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-07-01 DOI: 10.1016/1359-0197(92)90137-5

B.S. Yakovlev

引用次数: 2

Do OH radicals react with organic substances in gamma-irradiated frozen cells of golden hamster embryo? γ辐照金仓鼠胚胎冷冻细胞中OH自由基是否与有机物发生反应?

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-07-01 DOI: 10.1016/1359-0197(92)90138-6

Toru Yoshimura, Tetsuo Miyazaki, Shigehiro Mochizuki, Keiji Suzuki, Masami Watanabe

{"title":"Do OH radicals react with organic substances in gamma-irradiated frozen cells of golden hamster embryo?","authors":"Toru Yoshimura, Tetsuo Miyazaki, Shigehiro Mochizuki, Keiji Suzuki, Masami Watanabe","doi":"10.1016/1359-0197(92)90138-6","DOIUrl":"10.1016/1359-0197(92)90138-6","url":null,"abstract":"<div>Reactivity of OH radicals, produced by γ-irradiation, in golden hamster embryo (GHE) cells and in phosphate-buffered saline (PBS) solutions containing nuclei of the GHE cells was studied at 77 and 111 K by ESR spectroscopy. Since OH radicals do not diffuse in frozen cells at 77 K, they do not react with organic substances, such as protein and DNA, in the cells at 77 K. The efficiency of production and trapping of OH radicals at high concentration of organic substances in cells are the same as that at low concentration. Thus OH radicals produced near the organic substances do not react with them, being trapped at 77 K. When GHE cells or PBS-nuclei solutions are irradiated by γ-rays at 77 K and then warmed to 111 K, OH radicals decay fast, while the amounts of organic radicals remain constant at this temperature. These results indicate that OH radicals do not react with organic substances in γ-irradiated cells during warming of the irradiated cells. Therefore it was concluded that OH radicals are not the main reactive species responsible for biological effects in γ-irradiated frozen cells.</div>","PeriodicalId":14262,"journal":{"name":"International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry","volume":"40 1","pages":"Pages 45-48"},"PeriodicalIF":0.0,"publicationDate":"1992-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/1359-0197(92)90138-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77922418","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

Electron spin resonance of gamma-irradiated K2S2O5 single crystals 伽玛辐照K2S2O5单晶的电子自旋共振

International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry Pub Date : 1992-07-01 DOI: 10.1016/1359-0197(92)90140-B

Recep Tapramaz, Fevzi Köksal

{"title":"Electron spin resonance of gamma-irradiated K2S2O5 single crystals","authors":"Recep Tapramaz, Fevzi Köksal","doi":"10.1016/1359-0197(92)90140-B","DOIUrl":"10.1016/1359-0197(92)90140-B","url":null,"abstract":"<div>The electron spin resonance (ESR) spectra of γ-irradiated potassium pyrosulfite single crystals have been investigated between 300 and 103 K temperature interval. The signals were attributed to three SO-3 and a SO-2 radicals, and found to be temperature dependent. The SO-3 radicals were found to be inequivalent. The presence of three SO-3 radicals is not consistent with the monoclinic structure of K2S2O5 single crystal and this is attributed to any misadjustment of the orientations of SO-3 radicals to fit the crystal structure after irradiation. Elements of the g and hyperfine tensors of 33S nuclei with natural abundance of 0.74% for SO-3 and SO-2 radicals were determined. For two SO-3 radicals, the g and hyperfine values in a plane perpendicular to a axis of the crystal were found to be equal below 193 K, while they are different at room temperature. This reversible effect can be attributed to structural phase transition.</div>","PeriodicalId":14262,"journal":{"name":"International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry","volume":"40 1","pages":"Pages 55-57"},"PeriodicalIF":0.0,"publicationDate":"1992-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/1359-0197(92)90140-B","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82473695","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