Nukleonika最新文献_第6页

Chemical characterization of PM10 in two small towns located in South Poland 波兰南部两个小镇PM10的化学特征

IF 0.7 4区物理与天体物理

Nukleonika Pub Date : 2021-03-01 DOI: 10.2478/nuka-2021-0004

Anna Turek-Fijak, Joanna Brania, K. Styszko, D. Zięba, Z. Stęgowski, L. Samek

引用次数: 2

Natural zeolite as a replacement for resin in the cation exchange process of cesium on post-irradiated nuclear fuel 天然沸石在辐照后核燃料铯阳离子交换过程中替代树脂的研究

IF 0.7 4区物理与天体物理

Nukleonika Pub Date : 2021-03-01 DOI: 10.2478/nuka-2021-0002

Aslina Br. Ginting, A. Siti, Noviarty, Yanlinastuti, A. Nugroho, Boybul

{"title":"Natural zeolite as a replacement for resin in the cation exchange process of cesium on post-irradiated nuclear fuel","authors":"Aslina Br. Ginting, A. Siti, Noviarty, Yanlinastuti, A. Nugroho, Boybul","doi":"10.2478/nuka-2021-0002","DOIUrl":"https://doi.org/10.2478/nuka-2021-0002","url":null,"abstract":"Abstract Characterization of natural salts from Bayah, Lampung, and Tasikmalaya, Indonesia has been carried out as a substitute for synthetic resins. The characteristics include zeolite activation with NH4Cl, and heated at 200°C, the bond stability test of 137Cs-zeolite, chemical composition analysis, surface area, pore size, analysis of Cs cation exchange capacity (CEC), diffusion coefficient (Di), activation energy (Ea), and absorption of three zeolites. To do this, pipette 50 μl of a standard solution of 137Cs from the National Institute of Standards and Technology (NIST), put in, 2 ml of 0.1 N HCl, and then add 1 g of zeolite and stir each for 1, 2, 3, 4, 5, and 24 h. Based on this stirring time, the 137C isotope will exchange ions with NH4-zeolite to 137Cs-zeolite in the solid phase. The content of 137Cs in 137Cs-zeolites (solid phase) was analysed using a gamma spectrometer. The results of the chemical composition analysis showed that the character of zeolite from Lampung has a Si/Al ratio, with a CEC value of 1.448 mEq/g which is greater than Bayah and Tasikmalaya, while the Di and Ea values for the three select types were obtained almost the same. Moreover, the stability test of the Cs ion bond with zeolite showed no significant release of Cs ions from the zeolite structure. It can be concluded that the three soloists tested that the zeolite from Lampung has better characters. The results of 137Cs isotope separation in 150 μl of U3Si2/Al fuel solution post-irradiation using zeolite from Lampung and Dowex resins obtained almost the same recovery around 98–99%, so it can be concluded that zeolite from Lampung can be used as a substitute for synthetic resin in the cation exchange process for the 137Cs isotope in nuclear fuel post-irradiated.","PeriodicalId":19467,"journal":{"name":"Nukleonika","volume":"66 1","pages":"11 - 19"},"PeriodicalIF":0.7,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47493213","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

Comparison of dose distributions in target areas and organs at risk in conformal and VMAT techniques and dose verifications with the use of thermoluminescence dosimetry 适形和VMAT技术中靶区和危险器官的剂量分布比较以及使用热释光剂量测定法进行剂量验证

IF 0.7 4区物理与天体物理

Nukleonika Pub Date : 2020-10-23 DOI: 10.2478/nuka-2020-0033

M. Paluch-Ferszt, B. Kozłowska, M. Dybek

{"title":"Comparison of dose distributions in target areas and organs at risk in conformal and VMAT techniques and dose verifications with the use of thermoluminescence dosimetry","authors":"M. Paluch-Ferszt, B. Kozłowska, M. Dybek","doi":"10.2478/nuka-2020-0033","DOIUrl":"https://doi.org/10.2478/nuka-2020-0033","url":null,"abstract":"Abstract The aim of the present study is to compare dose distributions and their verification in target areas and organs at risk (OAR) in conformal and volumetric modulated arc therapy (VMAT) techniques. Proper verification procedures allow the removal of the major sources of errors, such as incorrect application of a planning system, its insufficient or cursory commissioning, as well as an erroneous interpretation of the obtained results. Three target areas (head and neck, chest, and pelvic) were selected and the treatment was delivered based on plans made using collapsed cone convolution and Monte Carlo algorithms with 6-MV photon beams, adopting conformal and VMAT techniques, respectively. All the plans were prepared for the anthropomorphic phantom. Dose measurements were performed with TL detectors made of LiF phosphor doped with magnesium and titanium (LiF:Mg,Ti). This paper presents the results of TL measurements and calculated doses, as well as their deviations from the treatment planning system (TPS) in the three planned target areas. It was established that the algorithms subject to analysis differ, particularly in dose calculations for highly inhomogeneous regions (OAR). Aside from the need to achieve the dose intended for the tumour, the choice of irradiation technique in teleradiotherapy should be dictated by the degree of exposure to individual critical organs during irradiation. While nothing deviated beyond the bounds of what is acceptable by international regulatory bodies in plans from TPS, clinically one must be more cautious with the OAR areas.","PeriodicalId":19467,"journal":{"name":"Nukleonika","volume":"65 1","pages":"217 - 222"},"PeriodicalIF":0.7,"publicationDate":"2020-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42430368","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: 0

Efficient reading of thermoluminescent dosimeter signals using semiconductor detectors 利用半导体探测器有效读取热释光剂量计信号

IF 0.7 4区物理与天体物理

Nukleonika Pub Date : 2020-10-23 DOI: 10.2478/nuka-2020-0034

P. Sobotka, Bartlomiej Klis, Z. Baranowska, K. Wołoszczuk, K. Rutkowska, T. Wolinski

引用次数: 0

Variation in rms charge radii of deuteron and helium nuclei with s sqrt s 氘核和氦核均方根电荷半径随s sqrt s的变化

IF 0.7 4区物理与天体物理

Nukleonika Pub Date : 2020-10-23 DOI: 10.2478/nuka-2020-0032

S. Zahra, B. Shafaq, B. Kanwal, Nosheen Akbar

引用次数: 0

Ablation of single-crystalline cesium iodide by extreme ultraviolet capillary-discharge laser 极紫外毛细管放电激光烧蚀单晶碘化铯

IF 0.7 4区物理与天体物理

Nukleonika Pub Date : 2020-10-23 DOI: 10.2478/nuka-2020-0031

J. Wild, P. Pira, T. Burian, L. Vyšín, L. Juha, Z. Zelinger, S. Danis, V. Nehasil, Zdeněk Rafaj, V. Nevrlý, M. Dostal, P. Bitala, P. Kudrna, M. Tichý, J. Rocca

引用次数: 0

Development of X-ray scanning system Sowa Sowa X射线扫描系统的研制

IF 0.7 4区物理与天体物理

Nukleonika Pub Date : 2020-10-23 DOI: 10.2478/nuka-2020-0035

Józef Bogowicz, M. Chabera, Wojciech Dziewiecki, Kacper Kaźmierczak, J. Klimaszewski, T. Kosiński, Andrzej Łubian, M. Matusiak, A. Wasilewski, M. Wojciechowski, S. Wronka, Tomasz Zakrzewski

引用次数: 0

Effect of electron beam irradiation on filtering facepiece respirators integrity and filtering efficiency 电子束辐照对过滤口罩完整性及过滤效率的影响

IF 0.7 4区物理与天体物理

Nukleonika Pub Date : 2020-07-25 DOI: 10.22541/au.159569105.56056755

D. Chmielewska, Łukasz Werner, U. Gryczka, W. Migdał

引用次数: 3

Long-term investigation of 137Cs and 134Cs in drinking water in the city of Zagreb, Croatia 克罗地亚萨格勒布市饮用水中137Cs和134Cs的长期调查

IF 0.7 4区物理与天体物理

Nukleonika Pub Date : 2020-07-06 DOI: 10.2478/nuka-2020-0030

Z. Franić, Gina Branica, B. Petrinec, G. Marović

{"title":"Long-term investigation of 137Cs and 134Cs in drinking water in the city of Zagreb, Croatia","authors":"Z. Franić, Gina Branica, B. Petrinec, G. Marović","doi":"10.2478/nuka-2020-0030","DOIUrl":"https://doi.org/10.2478/nuka-2020-0030","url":null,"abstract":"Abstract This paper presents the results of long-term investigations of 137Cs and 134Cs activity concentrations in drinking water in the city of Zagreb for the period 1987–2018. The highest activity concentrations of both radio-nuclides were measured in 1987, decreasing exponentially ever since, while 134Cs in several subsequent years fell under the detection limit. After the Fukushima Daiichi accident in 2011, the presence of 134Cs in drinking water was detected again. The environmental residence time for 137Cs was estimated to be 8.1 years in drinking water and 5.7 years in fallout. The correlation between 137Cs in fallout and in drinking water is very good, and this indicates that fallout is the main source of water contamination. The observed 134Cs/137Cs activity ratio in drinking water for the post-Chernobyl period was similar to the ratio found in other environmental samples. The estimation of annual effective doses received by the adult members of the Croatian population due to the intake of radiocaesium in drinking water showed quite small doses of 0.28 μSv in 1987 decreasing to 2.5 nSv in 2018, which indicated that drinking water was not a critical pathway for the transfer of radiocaesium to humans.","PeriodicalId":19467,"journal":{"name":"Nukleonika","volume":"65 1","pages":"193 - 198"},"PeriodicalIF":0.7,"publicationDate":"2020-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45287794","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

Economical evaluation of radiation processing with high-intensity X-rays 高强度x射线辐射处理的经济评价

IF 0.7 4区物理与天体物理

Nukleonika Pub Date : 2020-07-06 DOI: 10.2478/nuka-2020-0027

Z. Zimek

{"title":"Economical evaluation of radiation processing with high-intensity X-rays","authors":"Z. Zimek","doi":"10.2478/nuka-2020-0027","DOIUrl":"https://doi.org/10.2478/nuka-2020-0027","url":null,"abstract":"Abstract X-rays application for radiation processing was introduced to the industrial practice, and in some circumstances is found to be more economically competitive, and offer more flexibility than gamma sources. Recent progress in high-power accelerators development gives opportunity to construct and apply reliable high-power electron beam to X-rays converters for the industrial application. The efficiency of the conversion process depends mainly on electron energy and atomic number of the target material, as it was determined in theoretical predictions and confirmed experimentally. However, the lower price of low-energy direct accelerators and their higher electrical efficiency may also have certain influence on process economy. There are number of auxiliary parameters that can effectively change the economical results of the process. The most important ones are as follows: average beam power level, spare part cost, and optimal shape of electron beam and electron beam utilization efficiency. All these parameters and related expenses may affect the unit cost of radiation facility operation and have a significant influence on X-ray process economy. The optimization of X-rays converter construction is also important, but it does not depend on the type of accelerator. The article discusses the economy of radiation processing with high-intensity of X-rays stream emitted by conversion of electron beams accelerated in direct accelerator (electron energy 2.5 MeV) and resonant accelerators (electron energy 5 MeV and 7.5 MeV). The evaluation and comparison of the costs of alternative technical solutions were included to estimate the unit cost of X-rays facility operation for average beam power 100 kW.","PeriodicalId":19467,"journal":{"name":"Nukleonika","volume":"65 1","pages":"167 - 172"},"PeriodicalIF":0.7,"publicationDate":"2020-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46224754","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