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Proceedings in Radiochemistry最新文献

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Rapid environmental analysis using molten salt fusion sample preparation 使用熔盐熔样制备的快速环境分析
Proceedings in Radiochemistry Pub Date : 2011-09-01 DOI: 10.1524/RCPR.2011.0038
C. Armenta, E. Gonzáles, J. A. Herrera, A. Plionis, D. Peterson
{"title":"Rapid environmental analysis using molten salt fusion sample preparation","authors":"C. Armenta, E. Gonzáles, J. A. Herrera, A. Plionis, D. Peterson","doi":"10.1524/RCPR.2011.0038","DOIUrl":"https://doi.org/10.1524/RCPR.2011.0038","url":null,"abstract":"Abstract For the analysis of the isotopic composition of environmental samples, including transuranic materials there are many methods that exist. This paper describes the development of a high throughput method, which involves dissolving a soil into an aqueous matrix, producing a homogenous mixture, and separating radionuclides to enable the identification of specific isotopes. A standard method was modified via changes in oxidation, chemical exchange, decomposition, or rearrangements to form constituents that are more soluble in acidic aqueous solutions. To accomplish this, a molten-salt fusion, dissolution in dilutes nitric or hydrochloric acids, with subsequent separation using ion exchange, direct deposition, and counting by alpha-spectrometry was used. This method is ideal for silicate samples, but can be modified to accommodate more complex soil samples.","PeriodicalId":338467,"journal":{"name":"Proceedings in Radiochemistry","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115388040","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: 2
Characteristics of the elemental compositions of particulate matter at a subway platform using INAA and XRF 利用红外光谱和x射线辐射分析地铁站台颗粒物元素组成特征
Proceedings in Radiochemistry Pub Date : 2011-09-01 DOI: 10.1524/RCPR.2011.0054
J. M. Lim, J. Jeong, B. Jung, J. Lee, J. Moon, Y. Chung, K. Kim
{"title":"Characteristics of the elemental compositions of particulate matter at a subway platform using INAA and XRF","authors":"J. M. Lim, J. Jeong, B. Jung, J. Lee, J. Moon, Y. Chung, K. Kim","doi":"10.1524/RCPR.2011.0054","DOIUrl":"https://doi.org/10.1524/RCPR.2011.0054","url":null,"abstract":"Abstract In this study, a total of 21 elements were determined from PM2.5 and PM10 samples collected at one subway station using INAA and XRF. In order to assess the pollution status and distribution characteristics in a subway station, the absolute concentration levels, concentration ratios, and crustal enrichment factors of these elements were analyzed. PM2.5 concentrations in the subway station varied in the range of 24.8 to 72.6 μg m−3 (average ± standard deviation: 42.6 ± 10.6 μg m−3), while those of PM10 from 38.0 to 101 μg m−3 (67.2 ± 15.5 μg m−3). The relative contribution of elemental components in each particle fraction accounted for about 42 and 44%, respectively. Out of all metals, Fe was predominant to represent about 29 and 27% of each particle fraction. In contrast, the crustal sources were estimated to contribute to about 3.7 and 2.3% of the total Fe concentrations, respectively. Thus, one can conclude that considerable quantities of airborne Fe particles originated mainly from subway sources, probably due to the wearing of the steel products like wheel, rail, brake, etc.","PeriodicalId":338467,"journal":{"name":"Proceedings in Radiochemistry","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123697745","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: 2
Average charge of superheavy recoil ion in helium gas 氦气中超重反冲离子的平均电荷
Proceedings in Radiochemistry Pub Date : 2011-09-01 DOI: 10.1524/RCPR.2011.0018
D. Kaji, K. Morita, K. Morimoto, H. Haba, H. Kudo
{"title":"Average charge of superheavy recoil ion in helium gas","authors":"D. Kaji, K. Morita, K. Morimoto, H. Haba, H. Kudo","doi":"10.1524/RCPR.2011.0018","DOIUrl":"https://doi.org/10.1524/RCPR.2011.0018","url":null,"abstract":"Abstract The average equilibrium charges qave of heavy recoil ions moving in helium gas were measured by a gas-filled recoil ion separator (GARIS). A new empirical formula to calculate qave for superheavy recoil ions with a low velocity was derived. This formula was applicable to the search for a superheavy nuclide of 266Bh.","PeriodicalId":338467,"journal":{"name":"Proceedings in Radiochemistry","volume":"235 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123735049","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
Fusion of 9Li with 70Zn and 208Pb 9Li与70Zn和208Pb的聚变反应
Proceedings in Radiochemistry Pub Date : 2011-09-01 DOI: 10.1524/RCPR.2011.0026
W. Loveland
{"title":"Fusion of 9Li with 70Zn and 208Pb","authors":"W. Loveland","doi":"10.1524/RCPR.2011.0026","DOIUrl":"https://doi.org/10.1524/RCPR.2011.0026","url":null,"abstract":"Abstract The fusion excitation functions for the reaction of 9Li with 70Zn and 208Pb were measured. In the reaction with 70Zn, the evaporation residues (EVRs) were detected by a radiochemical separation of the As and Ge EVRs followed by β-counting. In the reaction with 208Pb, the At EVRs were detected by α-counting. In both systems, one observes substantial sub-barrier fusion enhancement that cannot be explained by coupled channels calculations. The implication of these studies for the study of the 11Li+208Pb reaction are discussed.","PeriodicalId":338467,"journal":{"name":"Proceedings in Radiochemistry","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114939769","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
Rapid separation and extraction of radioactive analytes onto filters and surfaces 在过滤器和表面上快速分离和提取放射性分析物
Proceedings in Radiochemistry Pub Date : 2011-09-01 DOI: 10.1524/RCPR.2011.0035
E. Gonzáles, A. Klingensmith, D. Peterson
{"title":"Rapid separation and extraction of radioactive analytes onto filters and surfaces","authors":"E. Gonzáles, A. Klingensmith, D. Peterson","doi":"10.1524/RCPR.2011.0035","DOIUrl":"https://doi.org/10.1524/RCPR.2011.0035","url":null,"abstract":"Abstract This paper presents a radiochemical procedure that combines radiochemical sample preparation and analyte separation to provide a rapid sample preparation method. Extractive ligands are prepared in a polymer matrix. This system can be immobilized on a surface or on a filter. Filters allow rapid sample uptake due to the movement of the analyte through the filter material. These approaches offer fast uptake kinetics, high material loading, and good selectivity. These systems have been demonstrated for the rapid extraction of plutonium and americium from solution and their subsequent analysis by alpha spectrometry, with no additional sample preparation required, thus eliminating extensive wet chemical processes that would otherwise be necessary. We have evaluated the extraction efficiency that can be obtained and have shown that these systems can provide for alpha spectrometry peak widths near what can be obtained using traditional techniques such as electroplating. We have also demonstrated Polymer Ligand Films (PLFs) for the selective extraction of plutonium from a solution prepared from a soil digest.","PeriodicalId":338467,"journal":{"name":"Proceedings in Radiochemistry","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122335402","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
Radioactive equilibria and disequilibria of U-series nuclides in the products from Izu arc volcanoes, Japan 日本伊豆弧火山产物中u系核素的放射性平衡与不平衡
Proceedings in Radiochemistry Pub Date : 2011-09-01 DOI: 10.1524/RCPR.2011.0059
Y. Kurihara, M. Takahashi, J. Sato
{"title":"Radioactive equilibria and disequilibria of U-series nuclides in the products from Izu arc volcanoes, Japan","authors":"Y. Kurihara, M. Takahashi, J. Sato","doi":"10.1524/RCPR.2011.0059","DOIUrl":"https://doi.org/10.1524/RCPR.2011.0059","url":null,"abstract":"Abstract Activity ratios among 238U-230Th-226Ra in the products from Izu arc volcanoes, Japan, were observed in order to estimate the time scale of magmatic processes and the magma generation for Izu arc volcanism. Activity ratios of 238U/230Th and 226Ra/230Th in the basaltic and andesitic products from Izu arc volcanoes were greater than unity, being enriched in 238U and 226Ra relative to 230Th. The 226Ra/230Th activity ratio versus 238U/230Th activity ratio diagram for these products showed positive correlation, suggesting that the 238U-230Th-226Ra disequilibria occurred during the magma genesis by the additions of U- and Ra-rich fluids derived from the subducting slab by dehydration to the mantle wedge. The 230Th-226Ra radioactive disequilibria observed in the basaltic and andesitic products imply a short period of time (<8000 years) between the magma genesis and the eruption. The majority of rhyolitic products was considered to be almost in equilibrium of 238U=230Th=226Ra. The observation that 238U-230Th-226Ra for the rhyolite are in radioactive equilibrium suggested that the rhyolitic magma from Izu arc was generated in the partial melting of the earth crust heated by the basaltic magma of high temperature.","PeriodicalId":338467,"journal":{"name":"Proceedings in Radiochemistry","volume":"105 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132539903","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
Radon, gamma-ray exposure and natural radionuclides 氡、伽马射线暴露和天然放射性核素
Proceedings in Radiochemistry Pub Date : 2011-09-01 DOI: 10.1524/RCPR.2011.0049
P. Wanabongse, W. Thorarit, N. Yimchalam, S. Bovornkitti
{"title":"Radon, gamma-ray exposure and natural radionuclides","authors":"P. Wanabongse, W. Thorarit, N. Yimchalam, S. Bovornkitti","doi":"10.1524/RCPR.2011.0049","DOIUrl":"https://doi.org/10.1524/RCPR.2011.0049","url":null,"abstract":"Abstract Measurements were conducted to determine residential radon exposure levels in provinces with high lung cancer incidence in three different regions of Thailand. The measurements revealed that the average indoor radon levels were 20.0, 24.4, and 13.1 Bq m−3, and that the average gamma dose rates were 145, 164, and 54 nSv h−1 in Chiangmai, Songkhla and Khonkaen provinces, respectively. The spectroscopic analysis of soil samples collected from the three provinces showed that the highest contents of Ra-226, Th-232, and K-40 were present in Songkhla, with values of 93.7, 71.9, and 786.9 Bq kg−1, respectively, and the lowest contents were present in Khonkaen, with values of 15.6, 19.0, and 46.8 Bq kg−1, respectively. The results of our analysis of the activity concentrations of naturally occurring radionuclides helped explain the lower levels of radon gas and gamma-ray exposure in Khonkaen.","PeriodicalId":338467,"journal":{"name":"Proceedings in Radiochemistry","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134071655","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
Half-life measurement of 7Be in host beryllium metal 母体铍金属中7Be的半衰期测定
Proceedings in Radiochemistry Pub Date : 2011-09-01 DOI: 10.1524/RCPR.2011.0017
T. Ohtsuki, K. Hirose, K. Ohno, T. Morisato
{"title":"Half-life measurement of 7Be in host beryllium metal","authors":"T. Ohtsuki, K. Hirose, K. Ohno, T. Morisato","doi":"10.1524/RCPR.2011.0017","DOIUrl":"https://doi.org/10.1524/RCPR.2011.0017","url":null,"abstract":"Abstract The decay rate of an electron-capture nucleus is proportional to the electron density at the nucleus. To see how the decay rate is changed by artificially, we have measured the half-life of7Be in beryllium(Be) metal at room temperature (T=293 K) and at close to the temperature of liquid helium (T=5 K). We found that the half-life of7Be in Be metal at T=293 K is 53.25 ± 0.04 d, which is slightly longer than those in the hosts of graphite, lithium fluoride and other minerals, surveyed so far. Furthermore, that at T=5 K is 53.39 ± 0.04 d, which is 0.26% longer than that at T =293 K.","PeriodicalId":338467,"journal":{"name":"Proceedings in Radiochemistry","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115492168","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
H/D isotope effect and magnetic properties of cyanide-bridged Nd(III)-Fe(III) complex 氰化物桥接Nd(III)-Fe(III)配合物的H/D同位素效应和磁性能
Proceedings in Radiochemistry Pub Date : 2011-09-01 DOI: 10.1524/RCPR.2011.0077
T. Akitsu, Yusuke Kimoto, Y. Yamada, K. Nomura
{"title":"H/D isotope effect and magnetic properties of cyanide-bridged Nd(III)-Fe(III) complex","authors":"T. Akitsu, Yusuke Kimoto, Y. Yamada, K. Nomura","doi":"10.1524/RCPR.2011.0077","DOIUrl":"https://doi.org/10.1524/RCPR.2011.0077","url":null,"abstract":"Abstract We have prepared four H/D isotope forms of Nd(DMF)4(H2O)3Fe(CN)6·H2O (DMF = N,N-dimethylformamide) by using D2O or DMF-d1. Temperature dependence of magnetization exhibits H/D isotope effects resulting from intermolecular hydrogen bonds. Temperature dependence of Fe 2p3/2 and 2p1/2 XAS and 57Fe Mössbauer spectra suggested that the influence of coordination environment could be distiguished from the influence of crystal lattice based on preliminary crystallographic results.","PeriodicalId":338467,"journal":{"name":"Proceedings in Radiochemistry","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115885245","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
Determination of degradation constant of Li ion from 10B(n,αγ)7Li reaction in various media 10B(n，αγ)7Li反应中Li离子降解常数的测定
Proceedings in Radiochemistry Pub Date : 2011-09-01 DOI: 10.1524/RCPR.2011.0055
G. Sun, Y. Lee, J. Moon, R. Acharya
{"title":"Determination of degradation constant of Li ion from 10B(n,αγ)7Li reaction in various media","authors":"G. Sun, Y. Lee, J. Moon, R. Acharya","doi":"10.1524/RCPR.2011.0055","DOIUrl":"https://doi.org/10.1524/RCPR.2011.0055","url":null,"abstract":"Abstract A Li ion from a 10B(n,αγ) 7Li reaction induced by a thermal neutron undergoes a large degradation due to its high stopping power in a medium. This phenomenon influences the peak line shape of the 477.6 keV gamma line emitted from an excited 7Li nucleus recoiled by an energetic alpha particle and the peak line shape in a spectrum varies according to the slowing-down media. A numerical study for the analysis of the line shape has been conducted by performing a parametric search and fitting the measured spectrum in a least squares approach by Choi et al. and implemented in a recent version of HYPERGAM code. In this study, the gamma-ray spectra were measured for various media like elemental boron, boric acid, borax, boron carbide, boron steel and so on at a SNU-KAERI prompt gamma activation analysis facility of the HANARO research reactor in Korea Atomic Energy Research Institute. The degradation constant was determined for various slowing-down media.","PeriodicalId":338467,"journal":{"name":"Proceedings in Radiochemistry","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133134348","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: 2
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