Journal of nuclear and radiochemical sciences最新文献

{"title":"Local Magnetic Field of a Perovskite Manganite La0.7Ca0.3MnO3","authors":"W. Sato, N. Ochi, A. Taniguchi, T. Terai, T. Kakeshita, A. Shinohara, Y. Ohkubo","doi":"10.14494/JNRS2000.8.89","DOIUrl":"https://doi.org/10.14494/JNRS2000.8.89","url":null,"abstract":"The time-differential perturbed angular correlation method with the 140Ce probe was applied to a microscopic investigation on a perovskite manganite, La07Ca03Mn03. A drastic change was observed in the time evolution of the directional anisotropies around the Curie temperature (Tc•`245K), reflecting the paramagnetic-ferromagnetic phase transition. The internal magnetic field at the probe nucleus stabilized at the A site was estimated to be Bint= 6.9•}0.3T at 240K, whereas no appreciable magnetic field was observed at 260 K. From a comparative study using two different probe-introduction methods, in addition, we found that ascendant ions of the probe, 140Ba and 140La , can be located at the A site by heat treatment.","PeriodicalId":16569,"journal":{"name":"Journal of nuclear and radiochemical sciences","volume":"13 1","pages":"89-92"},"PeriodicalIF":0.0,"publicationDate":"2007-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85352946","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}

{"title":"TDPAC and Its Application to Chemistry","authors":"Y. Ohkubo, Y. Murakami, W. Sato, A. Yokoyama","doi":"10.14494/JNRS2000.8.79","DOIUrl":"https://doi.org/10.14494/JNRS2000.8.79","url":null,"abstract":"Received: October 25, 2006; In Final Form: December 26, 2006 Time-differential perturbed angular correlation (TDPAC) is a powerful tool in material science for measuring the local electromagnetic fields at probe nuclei through hyperfine interactions. We have been applying this technique with reactor-made radioactive nuclei to several different material systems. In this paper, following a brief description of the TDPAC technique, our recent results are reviewed.","PeriodicalId":16569,"journal":{"name":"Journal of nuclear and radiochemical sciences","volume":"75 1","pages":"79-84"},"PeriodicalIF":0.0,"publicationDate":"2007-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82395834","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}

{"title":"Soil-to-crop Transfer Factors of Radium in Japanese Agricultural Fields","authors":"S. Uchida, K. Tagami","doi":"10.14494/JNRS2000.8.137","DOIUrl":"https://doi.org/10.14494/JNRS2000.8.137","url":null,"abstract":"Radium-226 (Ra), an α emitter with a half-life of about 1600 y, is a natural decay product of U. Radium-226 is of special interest because it is an important radionuclide for the assessment of radioactive waste disposal. This radionuclide can reach humans through several transfer paths in the environment. Once Ra is taken into the human body by ingestion of food and water or inhalation, it can distribute into bone where it has a long biological half-life; exposure to Ra can cause cancers and other body disorders. Therefore, its longterm management is required and understanding of Ra behavior in the environment is important. In mathematical models that are used for long-term radiological assessment, environmental transfer parameters are needed. Among them, the soil-to-crop transfer factor (TF) is a key parameter that directly affects the internal radiation dose assessment for the ingestion pathway. TF is defined as the ratio of radioactivity concentration in plant to radioactivity concentration in soil. Although Ra is present in the environment, due to its low concentration in crops, TFs that have been obtained from agricultural fields are limited. In many cases, therefore, TFs used in such models were from the Technical Report Series 364 (TRS-364) compiled by IAEA. These data were obtained in temperate zones mainly from Europe and North America, and thus, the numbers of TFs for rice and crops native to Japan were limited. Yunoki et al. measured TF-Ra for spinach and Chinese cabbage, but they collected their samples from only two fields. Recently, Sasaki et al. tried to measure crop TF-Ra, however, most sample concentrations were under the detection limit, and only two hulled rice sample data were available from their study. Thus, it is necessary to collect TFs of Ra nationwide. In this study, we determined the concentrations of Ra in upland field crops (leafy vegetables, onion, potato, and so on) and associated soils collected from 45 locations throughout Japan in order to obtain TFs. We also measured alkaline earth metal concentrations to compare their behavior with Ra, which is the last member of this group and whose lighter members, Mg and Ca, are plant nutrients. 2. Experimental","PeriodicalId":16569,"journal":{"name":"Journal of nuclear and radiochemical sciences","volume":"103 1","pages":"137-142"},"PeriodicalIF":0.0,"publicationDate":"2007-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78085016","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}

{"title":"Protein Expression of Saccharomyces cerevisiae in Response to Uranium Exposure","authors":"F. Sakamoto, T. Nankawa, N. Kozai, T. Fujii, H. Iefuji, A. Francis, T. Ohnuki","doi":"10.14494/JNRS2000.8.133","DOIUrl":"https://doi.org/10.14494/JNRS2000.8.133","url":null,"abstract":"F. Sakamoto, T. Nankawa, N. Kozai, T. Fujii, H. Iefuji, A. J. Francis, and T. Ohnuki aAdvanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan bEnvironmentai Research Division, National Research Institute of Brewing, Higashi Hiroshima, Hiroshima 7390046, Japan c Environmental Sciences Department, Brookhaven National Laboratory, Upton, New York 11973, USA dEcoTopia Science Institute, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan","PeriodicalId":16569,"journal":{"name":"Journal of nuclear and radiochemical sciences","volume":"19 1","pages":"133-136"},"PeriodicalIF":0.0,"publicationDate":"2007-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84103593","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}

{"title":"A Simple Rainout Model for Radon Daughters","authors":"Susurnu Minato","doi":"10.14494/JNRS2000.8.N1","DOIUrl":"https://doi.org/10.14494/JNRS2000.8.N1","url":null,"abstract":"This paper presents a simplified time-independent model which calculates radioactivities of short-lived radon daughters in rainwater as a function of rainfall rate for unit concentration of radon in cloud. The model incorporates processes of impact collection for cloud droplets by raindrops, removal of raindrops from cloud and transport time of raindrops from the cloud base to the ground as forms of semi-empirical formulas. Radon concentrations in rain clouds are estimated from comparisons between model calculations and ground-level observations made over a few years.","PeriodicalId":16569,"journal":{"name":"Journal of nuclear and radiochemical sciences","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2007-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76092245","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}

{"title":"Titanium Molybdate Gels as Matrix of 99Mo/99mTc Generators","authors":"F. Guzman, O. Romero, H. D. Velázquez","doi":"10.14494/JNRS2000.8.11","DOIUrl":"https://doi.org/10.14494/JNRS2000.8.11","url":null,"abstract":"","PeriodicalId":16569,"journal":{"name":"Journal of nuclear and radiochemical sciences","volume":"4 1","pages":"11-19"},"PeriodicalIF":0.0,"publicationDate":"2007-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74560870","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}

{"title":"Analysis of Uranium Bearing Samples for Rare Earth and Other Elements by k0-Based Internal Monostandard INAA Method","authors":"S. Tiwari, A. Nair, R. Acharya, A. Reddy, A. Goswami","doi":"10.14494/JNRS2000.8.25","DOIUrl":"https://doi.org/10.14494/JNRS2000.8.25","url":null,"abstract":"","PeriodicalId":16569,"journal":{"name":"Journal of nuclear and radiochemical sciences","volume":"23 1","pages":"25-30"},"PeriodicalIF":0.0,"publicationDate":"2007-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82807873","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}

{"title":"Highly Time-Resolved Measurements of Airborne Radionuclides by Extremely Low Background γ-ray Spectrometry","authors":"T. Abe, Y. Yamaguchi, Kiwamu Tanaka, Y. Nakano, K. Komura","doi":"10.14494/JNRS2000.8.5","DOIUrl":"https://doi.org/10.14494/JNRS2000.8.5","url":null,"abstract":"","PeriodicalId":16569,"journal":{"name":"Journal of nuclear and radiochemical sciences","volume":"24 1","pages":"5-9"},"PeriodicalIF":0.0,"publicationDate":"2007-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77091499","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}

{"title":"Metal Atom Dynamics in Sn (II) Phthalocyanin from Temperature-dependent 119Sn M^|^ouml;ssbauer Spectroscopy","authors":"R. Herber","doi":"10.14494/JNRS2000.8.21","DOIUrl":"https://doi.org/10.14494/JNRS2000.8.21","url":null,"abstract":"geometry. SnPc has been subjected to several 119Sn Mossbauer studies3 and the hyperfine parameters the isomer shift (IS) and quadrupole splitting (QS) have been reported2,4 at or near liquid nitrogen temperature. The focus of the present study is to relate the temperaturedependence of the recoil-free fraction, f, of the tin atom to the dynamics of the metal atom and to examine in detail the motional anisotropy of the metal center over a significant tem-","PeriodicalId":16569,"journal":{"name":"Journal of nuclear and radiochemical sciences","volume":"61 1","pages":"21-23"},"PeriodicalIF":0.0,"publicationDate":"2007-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88233687","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}

{"title":"57Fe M^|^ouml;ssbauer, UV-visible, and FT-IR Study on Photoinduced Spin Transition of FeII -Triazole Complex","authors":"T. Mitsuoka, M. Nakagawa, T. Iyoda, Y. Einaga","doi":"10.14494/JNRS2000.8.1","DOIUrl":"https://doi.org/10.14494/JNRS2000.8.1","url":null,"abstract":"","PeriodicalId":16569,"journal":{"name":"Journal of nuclear and radiochemical sciences","volume":"92 1","pages":"1-3"},"PeriodicalIF":0.0,"publicationDate":"2007-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81641783","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}