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GC investigation of post-irradiation oxidation phenomena on polypropylene 聚丙烯辐照后氧化现象的GC研究

IF 0.7 4区物理与天体物理

Nukleonika Pub Date : 2021-11-25 DOI: 10.2478/nuka-2021-0027

W. Głuszewski

{"title":"GC investigation of post-irradiation oxidation phenomena on polypropylene","authors":"W. Głuszewski","doi":"10.2478/nuka-2021-0027","DOIUrl":"https://doi.org/10.2478/nuka-2021-0027","url":null,"abstract":"Abstract The paper summarizes the results of research on gas products of polypropylene (PP) radiolysis. Particular attention was paid to the phenomena of post-radiation degradation of PP. The protective effect of selected aromatic compounds was investigated. The research was carried out both from the point of view of obtaining radiation-resistant PP varieties and the possibility of accelerating biodegradation phenomena, e.g., PP/cellulose composition. The phenomena of post-radiation chain oxidation of PP were investigated by gas chromatography (GC). The GC in the system used (packed column, thermal conductivity detector, argon – carrier gas) enables the determination of H2, O2, CO, and CH4 in one measurement. The samples were irradiated with electron beams (EBs) accelerated in accelerators: Elektronika 10/10 with a power of 10 kW and energy of 10 MeV and LAE 13/9 with a power of 9 kW and energy up to 13 MeV. In the tests, PP without stabilizing additives (obtained directly from the production line) and non-stabilized styrene were used. Radiolytic efficiency of hydrogen evolution allowed us to estimate the number of originally formed free radicals. The maintenance of the secondary oxidation processes was the loss of oxygen and the formation of oxidation products (CO, CH4). Attention is paid to the protective effect of aromatic compounds (polystyrene (PS), polyethylene terephthalate (PET), anthracene, fluoranthene, acenaphthene, pyrene, naphthalene) both at the stage of hydrogen atom separation and the secondary oxidation process. The examples of post-radiation oxidation of PP irradiated in cryogenic conditions (–196°C) are presented. All used aromatic compounds showed a protective effect in PP radiolysis. We suppose that this phenomenon is responsible for the charge transfer along the polymer chain from the ionization spurs to the aromatic compound. The protective ranges of PS in PP radiolysis were estimated for the variously prepared PP/PS type compositions from 6 mers to 28 mers.","PeriodicalId":19467,"journal":{"name":"Nukleonika","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2021-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43200489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

The use of gamma irradiation to stimulate bioactive compound synthesis in Inonotus obliquus submerged cultures 利用伽马射线照射刺激斜凤尾鱼深层培养物中生物活性化合物的合成

IF 0.7 4区物理与天体物理

Nukleonika Pub Date : 2021-09-01 DOI: 10.2478/nuka-2021-0012

A. Petre, M. Ene, D. Negut, F. Gatea, E. Vamanu

{"title":"The use of gamma irradiation to stimulate bioactive compound synthesis in Inonotus obliquus submerged cultures","authors":"A. Petre, M. Ene, D. Negut, F. Gatea, E. Vamanu","doi":"10.2478/nuka-2021-0012","DOIUrl":"https://doi.org/10.2478/nuka-2021-0012","url":null,"abstract":"Abstract Inonotus obliquus is a parasite on the birch and other trees and is also a well-known medicinal mushroom. Its sterile conk is highly sought for its bioactive compounds such as phenols, polysaccharides, triterpenoids, and steroids. It was traditionally used to treat various gastrointestinal diseases, viral and parasitic infections, to counteract the progression of cancers, and to stimulate the immune system. We used acute gamma irradiation, followed by short-term submerged cultivation, as an oxidative stress inducer to enhance the synthesis of mycelial metabolites. The 300 Gy and 400 Gy doses showed the best results across the whole experimental design. Each assayed criterion had a different corresponding optimal stimulation dose. In one experiment, sublethal doses of irradiation triggered the dry weight of the cultured mycelium to increase by 19.764%. The free radical scavenging potential of the mycelium extracts increased by 79.83%. The total phenolic content of mycelium extracts and culture broth increased by 55.7% and 62.987%, respectively. The total flavonoid and sinapinic acid content of the broth increased by 934.678% and 590.395%, respectively. As such, gamma irradiation pre-treatment of the mycelial inoculum proved an interesting, economically and environmentally effective tool for stimulating secondary metabolite synthesis in submerged mycelium cultures.","PeriodicalId":19467,"journal":{"name":"Nukleonika","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44696530","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Research on dose correction method of vehicle-borne environmental radiation measurement equipment 车载环境辐射测量设备剂量校正方法研究

IF 0.7 4区物理与天体物理

Nukleonika Pub Date : 2021-09-01 DOI: 10.2478/nuka-2021-0015

Jie Xu, Jizhou Ren, Jianbo Yang, Jiawen Fan, Rui Li, Hui Li, Weiqi Huang, Biao Yuan

{"title":"Research on dose correction method of vehicle-borne environmental radiation measurement equipment","authors":"Jie Xu, Jizhou Ren, Jianbo Yang, Jiawen Fan, Rui Li, Hui Li, Weiqi Huang, Biao Yuan","doi":"10.2478/nuka-2021-0015","DOIUrl":"https://doi.org/10.2478/nuka-2021-0015","url":null,"abstract":"Abstract This study establishes a near-ground reference radiation field based on typical radionuclides of the Fukushima accident in response to the need for vehicle-borne environmental radiation measurement equipment that can accurately evaluate the environmental dose of nuclear accidents. The Monte Carlo code FLUKA is used to study the environmental dose of such equipment in the early and mid-late reference radiation fields of nuclear accidents. Results of the air dose rate at 1 m above the ground were corrected to eliminate data difference between diverse measurement platforms. Simulation results show that t he dose correction factor (CF) fluctuates at approximately 0.8813 in the early reference radiation field and at approximately 0.6711 in the mid-late reference radiation field. This deviation of the dose CF in the early and mid-late reference radiation fields is within 2% and is not affected by the change in detector position. This research can be applied to obtain more accurate measurement of an ambient dose in the near-ground radiation field and support the vehicle-borne environmental radiation measurement technology.","PeriodicalId":19467,"journal":{"name":"Nukleonika","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47626455","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Gamma radiation calculations and gamma blocker design for the high-energy beam transport region of the European Spallation Source 欧洲散裂源高能束输运区的伽马辐射计算和伽马阻断器设计

IF 0.7 4区物理与天体物理

Nukleonika Pub Date : 2021-09-01 DOI: 10.2478/nuka-2021-0014

Karol S. Szymczyk, S. Wronka

引用次数: 1

European inter-comparison studies as a tool for perfecting irradiated food detection methods 欧洲相互比较研究作为完善辐照食品检测方法的工具

IF 0.7 4区物理与天体物理

Nukleonika Pub Date : 2021-09-01 DOI: 10.2478/nuka-2021-0013

G. Guzik, J. Michalik

{"title":"European inter-comparison studies as a tool for perfecting irradiated food detection methods","authors":"G. Guzik, J. Michalik","doi":"10.2478/nuka-2021-0013","DOIUrl":"https://doi.org/10.2478/nuka-2021-0013","url":null,"abstract":"Abstract In this paper, we present the results of inter-comparison studies on identification of irradiated food carried out by the leading European laboratories from 1991 to 2018. In 1990s, the Federal Institute for Health Protection of Consumers and Veterinary Medicine in Germany played the leading role in the organization of the inter-laboratory tests on this subject. At the beginning of the present century, the Spanish Agency for Food Safety and Nutrition and Food National Spanish Centre took over this role. In total, 47 international tests were carried out in which nearly 500 samples of alimentary products were analysed in 37 laboratories from 14 European countries. The tests were aimed at proving the reliability of analytical methods – thermoluminescence (TL), photostimulated luminescence (PSL), and electron paramagnetic resonance (EPR) spectroscopy – for identification of specific irradiated food products and to control the analytical skills and experience of participating laboratories. The results made possible a discussion on why some irradiated food samples are more difficult for identification. In general, the tests showed that TL measurements of products such as herbs, nuts, peppers, and raisins, and EPR studies of fish and chicken bones, fresh strawberries, and dried fruits could be used as reliable control methods. The challenge that control laboratories are facing now, is related to the identification of complex food products such as diet supplements or biopharmaceuticals, in which only some additives are irradiated.","PeriodicalId":19467,"journal":{"name":"Nukleonika","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42985438","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Design and fabrication of 125I seeds for brachytherapy using capillary-based microfluidic technique 基于毛细管微流控技术的近距离治疗用125I粒子的设计与制备

IF 0.7 4区物理与天体物理

Nukleonika Pub Date : 2021-06-01 DOI: 10.2478/nuka-2021-0007

Yuan-Yuan Wang, Miao Zhang, Tong Song, Zhenqi Chang

引用次数: 0

Optimization of 210Po determination in soil 土壤中210Po测定的优化

IF 0.7 4区物理与天体物理

Nukleonika Pub Date : 2021-06-01 DOI: 10.2478/nuka-2021-0010

Grzegorz Szaciłowski, Małgorzata Dymecka, Maria Prusińska, Katarzyna Rzemek, J. Ośko, Magdalena Mądry, Michalina Kostecka, A. Araszkiewicz

引用次数: 1

Erratum to “Radon incomparison tests – Katowice, 2016” [Nukleonika 2020;65(2):127-132, doi:10.2478/nuka-2020-0020]

IF 0.7 4区物理与天体物理

Nukleonika Pub Date : 2021-06-01 DOI: 10.2478/nuka-2021-0011

S. Chałupnik, K. Skubacz, M. Wysocka, J. Mazur, M. Bonczyk, K. Kozak, D. Grządziel, P. Urban, D. Tchorz-Trzeciakiewicz, B. Kozłowska, A. Walencik-Łata, A. Podstawczyńska, J. Olszewski, J. Bartak, M. Karpińska, K. Wołoszczuk, M. Dohojda, Jakub Nowak, M. Długosz-Lisiecka, E. Foerster, T. Przylibski

引用次数: 0

Validation of transient time method to calibrate oil flow meters in closed conduits using 123I as the radiotracer 使用123I作为放射性示踪剂校准封闭管道中油流量计的瞬态时间方法的验证

IF 0.7 4区物理与天体物理

Nukleonika Pub Date : 2021-06-01 DOI: 10.2478/nuka-2021-0009

E. Goncalves, L. E. Brandão, D. Braz

引用次数: 1

Production of actinium-225 from a (n,p) reaction: Feasibility and pre-design studies 从(n,p)反应生产锕-225:可行性和预设计研究

IF 0.7 4区物理与天体物理

Nukleonika Pub Date : 2021-06-01 DOI: 10.2478/nuka-2021-0008

F. Abolaban, E. Banoqitah, Eslam M. Taha, A. Alhawsawi, F. Djouider, A. Nisbet

引用次数: 0