核科学与技术国际期刊(英文)最新文献_第9页

Studying the Nuclear Structure of Some Target Nuclei Used for Radiotherapy Nuclei Production by Using Skyrme-Hartree-Fock Method 用Skyrme-Hartree-Fock方法研究一些放射治疗产核靶核的核结构

核科学与技术国际期刊(英文) Pub Date : 2017-04-03 DOI: 10.4236/WJNST.2017.72006

A. Alzubadi, Duaa Majid Hameed

引用次数: 4

Quality Assessment Statistic Evaluation of X-Ray Fluorescence via NIST and IAEA Standard Reference Materials 通过NIST和IAEA标准参比物质对x射线荧光进行质量评价和统计评价

核科学与技术国际期刊(英文) Pub Date : 2017-04-03 DOI: 10.4236/WJNST.2017.72010

O. Ahmed, F. Habbani, A. M. Mustafa, E. Mohamed, A. M. Salih, Ftihia Seedig

{"title":"Quality Assessment Statistic Evaluation of X-Ray Fluorescence via NIST and IAEA Standard Reference Materials","authors":"O. Ahmed, F. Habbani, A. M. Mustafa, E. Mohamed, A. M. Salih, Ftihia Seedig","doi":"10.4236/WJNST.2017.72010","DOIUrl":"https://doi.org/10.4236/WJNST.2017.72010","url":null,"abstract":"The aim of this study is a quality assessment of X-ray fluorescence laboratory located at the University of Khartoum. The X-ray fluorescence spectrometer system consists, a set of three 109Cd sources of an initial nominal activity of 10 μCi, and Si(Li) detector Energy Dispersive XRF(EDXRF) systems. It is important to carry out this work because it has an effective contribution for a wide range of research and services. The assessment was carried out by measuring 8 NIST-2709a (soil) and 13 IAEA-155 (milk powder) standard reference material samples for repeatability examinations to test the measurement precision. The total combined standards uncertainty values for XRF lab were estimated by an error from repeatability measurements adding 2.6% for error propagation related to the method. For accuracy assessment, three standard statistic approaches were applied, i.e. the Bias %, zeta-score, and En-number. The bias of all elements for both standard materials was found to be within a deviation range from −28% to 7.8%. The results of all elements for both the zeta-score test and En-number have satisfactory results except Th (Thorium) and Zr (Zirconium) which consider as questionable results for NIST SRM 2709a and unsatisfactory results for En-number.","PeriodicalId":61566,"journal":{"name":"核科学与技术国际期刊(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48109602","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: 8

Further Studies of BURSTS and Spallation in High-Energy Heavy Ion Reactions 高能重离子反应中爆发和散裂的进一步研究

核科学与技术国际期刊(英文) Pub Date : 2017-01-09 DOI: 10.4236/WJNST.2017.71004

R. Hashemi-Nezhad, R. Brandt, V. Ditlov, M. Haiduc, E. Firu, A. Neagu, E. Ganssauge, W. Westmeier

{"title":"Further Studies of BURSTS and Spallation in High-Energy Heavy Ion Reactions","authors":"R. Hashemi-Nezhad, R. Brandt, V. Ditlov, M. Haiduc, E. Firu, A. Neagu, E. Ganssauge, W. Westmeier","doi":"10.4236/WJNST.2017.71004","DOIUrl":"https://doi.org/10.4236/WJNST.2017.71004","url":null,"abstract":"Aspects of BURSTS and Spallation reactions induced by high-energy heavy ions in thick targets (>10 cm thick) will be investigated: BURSTS are reviewed from a historical and phenomenological point-of-view. Details of interactions in nuclear emulsions will be compared for irradiations of 72 GeV 22Ne-ions from Dubna with irradiations of 72 GeV 40Ar-ions from Berkeley. Measured correlations in individual interactions between multiplicities of “minimum ionizing particles”, ns, and “black prongs”, nb, will be shown as “ns-vs.-nb” per event for BURSTS and separately for Spallation in interactions of 72 GeV 22Ne-ions. Monte Carlo calculations, based on the MCNPX 2.7 code, have been carried out for 72 GeV 22Ne interacting in nuclear emulsions: The correlation between ns and nb in Spallation reactions could be understood. However, “ns-vs.-nb” correlations from BURST-interactions could not be reproduced with this model for events with small numbers of heavy prongs nh ≤ 10. For large numbers of heavy prongs with nh > 10 one could find some agreement between experiments and calculations, however, not in all details. Further experimental and theoretical studies are necessary before one has a complete understanding of BURST interactions in high-energy heavy ion reactions.","PeriodicalId":61566,"journal":{"name":"核科学与技术国际期刊(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45553005","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

Evaluation of Corrosion Product Activity in a Typical PWR with Extended Cycles and Flow Rate Perturbations 典型压水堆中扩展循环和流量扰动腐蚀产物活性的评价

核科学与技术国际期刊(英文) Pub Date : 2017-01-01 DOI: 10.4236/WJNST.2017.71003

Rubina Nasir, S. Mirza, N. M. Mirza

引用次数: 9

Control Rod Calibration and Worth Calculation for Optimized Power Reactor 1000 (OPR-1000) Using Core Simulator OPR1000 利用堆芯模拟器OPR1000标定优化功率堆(OPR-1000)控制棒及价值计算

核科学与技术国际期刊(英文) Pub Date : 2017-01-01 DOI: 10.4236/WJNST.2017.71002

Nguyen An Son, N. Hoa, T. Nguyen, T. Tuan, Osvaldo Camueje Raul

{"title":"Control Rod Calibration and Worth Calculation for Optimized Power Reactor 1000 (OPR-1000) Using Core Simulator OPR1000","authors":"Nguyen An Son, N. Hoa, T. Nguyen, T. Tuan, Osvaldo Camueje Raul","doi":"10.4236/WJNST.2017.71002","DOIUrl":"https://doi.org/10.4236/WJNST.2017.71002","url":null,"abstract":"Control rod is used to change the power in nuclear reactor. Certainly, the core at any moment can be made subcritical condition and shut downs when occurring to emergency instance in the core. The rod is grouped based on their function and located at different places in the core where their feature is maximized. Two methods of control rod calibration are the asymptotic period method and the rod-drop method, which were applied in this experiment. In the first method, the reactor is made supcritical by inserting the control rod to be calibrated a certain level. The rod drop method is to determine the subcritical; at the critical state, the rod to be calibrated is dropped into the core, and the resulting decay of neutron flux is observed and related to the reactivity. In this paper, the regulating rod will be calibrated according to the reactivity in OPR-1000 that corresponds to a certain control rod insert or withdraw, and the reactivity in power reactor depends on the integral and differential control rod group too. The core simulator OPR1000 is used to test those methods.","PeriodicalId":61566,"journal":{"name":"核科学与技术国际期刊(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2017-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70889296","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

Generation and Detection of a Directed Monoenergetic Neutrino Beam with Hydrogen-Like Ions 类氢离子定向单能中微子束的产生和探测

核科学与技术国际期刊(英文) Pub Date : 2017-01-01 DOI: 10.4236/WJNST.2017.71005

L. Folan, V. Tsifrinovich

引用次数: 2

Electromagnetic Theory of the Nuclear Interaction 核相互作用的电磁理论

核科学与技术国际期刊(英文) Pub Date : 2016-09-08 DOI: 10.4236/WJNST.2016.64021

B. Schaeffer

引用次数: 4

Technological Perspectives for Propulsion on Nuclear Attack Submarines 核攻击潜艇推进技术展望

核科学与技术国际期刊(英文) Pub Date : 2016-09-08 DOI: 10.4236/WJNST.2018.81001

L. O. Freire, D. A. Andrade

引用次数: 0

Assessment of the Radiological Impact on the Environment near a Storage Site of Coal Ashes in a Thermal Power Plant 某火电厂煤灰堆积场附近环境辐射影响评价

核科学与技术国际期刊(英文) Pub Date : 2016-09-08 DOI: 10.4236/WJNST.2016.64022

A. Boukhair, Laila Belahbib, Khadija Azkour, H. Nebdi, M. Benjelloun, A. Nourreddine

{"title":"Assessment of the Radiological Impact on the Environment near a Storage Site of Coal Ashes in a Thermal Power Plant","authors":"A. Boukhair, Laila Belahbib, Khadija Azkour, H. Nebdi, M. Benjelloun, A. Nourreddine","doi":"10.4236/WJNST.2016.64022","DOIUrl":"https://doi.org/10.4236/WJNST.2016.64022","url":null,"abstract":"The radiological impact of coal ashes, with enhanced natural radioactivity in the storage site, is due to the presence of naturally occurring radionuclides. Some of these radionuclides have a radioactive period of several million years and will, therefore, have time to migrate to the soil, atmospheric air, surface water, and groundwater. This impact depends mainly on the activity of these coal ashes, the duration of exposure to such waste, transfers to the air, and the leaching phenomenon by rainwater. In this study, and so as to assess the radiological impact of coal ashes of the storage site of the JLEC-Morocco thermal power plant on environment, some analyses are performed by alpha dosimetry and a digital dosimeter on samples of coal ashes, soil, atmospheric air, surface water and groundwater belonging to a perimeter of 10 km around that site. The obtained results show that, within the studied area, the radiological impact on the soil of the coal ashes of the storage site is insignificant even though the concentrations of radon in the near vicinity (1 to 2 km) are moderately important, and remain below 200 Bq/m3. In the atmospheric air, this impact remains medium for the neighborhoods of the storage site (2 to 3 km) with radon activities superior to 10 Bq/m3. These results also show that there may be a water contamination of wells located at the storage site without any transfer of radioactivity into the groundwater of the area studied where the concentrations of radon are less than 11.1 Bq/l.","PeriodicalId":61566,"journal":{"name":"核科学与技术国际期刊(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70889257","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: 4

Method to Measure Indoor Radon Concentration in an Open Volume with Geiger-Mueller Counters: Analysis from First Principles 盖革-穆勒计数器测量室内开放体积氡浓度的方法:从第一性原理分析

核科学与技术国际期刊(英文) Pub Date : 2016-09-08 DOI: 10.4236/WJNST.2016.64024

M. Silverman

{"title":"Method to Measure Indoor Radon Concentration in an Open Volume with Geiger-Mueller Counters: Analysis from First Principles","authors":"M. Silverman","doi":"10.4236/WJNST.2016.64024","DOIUrl":"https://doi.org/10.4236/WJNST.2016.64024","url":null,"abstract":"A simple method employing a pair of pancake-style Geiger-Mueller (GM) counters for quantitative measurement of radon activity concentration (activity per unit volume) is described and demonstrated. The use of two GM counters, together with the basic theory derived in this paper, permit the detection of alpha particles from decay of and progeny ( 218Po, 214Po) and the conversion of the alpha count rate into a radon concentration. A unique feature of this method, in comparison with standard methodologies to measure radon concentration, is the absence of a fixed control volume. Advantages afforded by the reported GM method include: 1) it provides a direct in-situ value of radon level, thereby eliminating the need to send samples to an external testing laboratory; 2) it can be applied to monitoring radon levels exhibiting wide short-term variability; 3) it can yield short-term measurements of comparable accuracy and equivalent or higher precision than a commercial radon monitor sampling by passive diffusion; 4) it yields long-term measurements statistically equivalent to commercial radon monitors; 5) it uses the most commonly employed, overall least expensive, and most easily operated type of nuclear instrumentation. As such, the method is par-ticularly suitable for use by researchers, public health personnel, and home dwellers who prefer to monitor indoor radon levels themselves. The results of a consecutive 30-day sequence of 24 hour mean radon measurements by the proposed GM method and a commercial state-of-the-art radon monitor certified for radon testing are compared.","PeriodicalId":61566,"journal":{"name":"核科学与技术国际期刊(英文)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-09-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70888951","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: 5