Pub Date : 2021-01-15DOI: 10.3769/RADIOISOTOPES.70.29
N. Nihei, Yasuhiro Ichihashi
{"title":"Functions of Organic Components Involved in Crop Growth Revealed by the Use of Isotope Tracer Experiment","authors":"N. Nihei, Yasuhiro Ichihashi","doi":"10.3769/RADIOISOTOPES.70.29","DOIUrl":"https://doi.org/10.3769/RADIOISOTOPES.70.29","url":null,"abstract":"","PeriodicalId":20809,"journal":{"name":"Radioisotopes","volume":"55 1","pages":"29-39"},"PeriodicalIF":0.0,"publicationDate":"2021-01-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91344797","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}
Pub Date : 2021-01-01DOI: 10.3769/radioisotopes.70.131
T. Fukuchi
I carry out the assessment of fault activity of the Shimotsuburai and Hoozan faults belonging to the Itoigawa-Shizuoka Tectonic Line Active Fault System located at the northeast and east edges of the South Alps of Japan, using ESR (electron spin resonance) dating method. The age of the latest fault movement (T a ) of the Shimotsuburai fault, which is recognized as an active fault, is estimated as T a ≤ 1.04±0.14 Ma. This result means that the principle of ESR dating method of fault movement is sustained. On the other hand, the age of the latest fault movement of the Hoozan fault, which is regarded as an estimated active fault by a topographical feature, is estimated as T a ≤ 0.58±0.10 Ma. Therefore, I conclude that the Hoozan fault is probably an active fault having moved since the Middle Pleistocene.
{"title":"Absolute dating of active faults and the assessment of fault activity using ESR dating method: The case of the Itoigawa–Shizuoka Tectonic Line Active Fault System","authors":"T. Fukuchi","doi":"10.3769/radioisotopes.70.131","DOIUrl":"https://doi.org/10.3769/radioisotopes.70.131","url":null,"abstract":"I carry out the assessment of fault activity of the Shimotsuburai and Hoozan faults belonging to the Itoigawa-Shizuoka Tectonic Line Active Fault System located at the northeast and east edges of the South Alps of Japan, using ESR (electron spin resonance) dating method. The age of the latest fault movement (T a ) of the Shimotsuburai fault, which is recognized as an active fault, is estimated as T a ≤ 1.04±0.14 Ma. This result means that the principle of ESR dating method of fault movement is sustained. On the other hand, the age of the latest fault movement of the Hoozan fault, which is regarded as an estimated active fault by a topographical feature, is estimated as T a ≤ 0.58±0.10 Ma. Therefore, I conclude that the Hoozan fault is probably an active fault having moved since the Middle Pleistocene.","PeriodicalId":20809,"journal":{"name":"Radioisotopes","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89303645","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}
Pub Date : 2020-12-15DOI: 10.3769/radioisotopes.69.365
Y. Miyazaki, G. Yoshida, K. Masumoto, H. Matsumura, Masahiro Tanaka
Herein, we present the case study of the decontamination of highly activated concrete in the accelerator room. The activated cyclotron room for pharmaceutical for the positron emission tomography (PET) in the Medical and Pharmacological Research Center Foundation (Ishikawa, Japan) was decontaminated. The contact dose rates of the concrete walls, floor, and ceiling were measured at 50 cm mesh using a NaI survey meter. The depth profiles of spe cific activity in the concretes were obtained by core boring at seven different places. The activated concrete regions were estimated in detail based on the relationship between the measured contact dose rates and depth profiles of the specific activity. The activated concrete was chipped and
{"title":"Decontamination Plan for the Concrete of the Activated Accelerator Room and Its Implementation: A Case Study in the Decommissioning of the PET Cyclotron Room at the Medical and Pharmacological Research Center Foundation","authors":"Y. Miyazaki, G. Yoshida, K. Masumoto, H. Matsumura, Masahiro Tanaka","doi":"10.3769/radioisotopes.69.365","DOIUrl":"https://doi.org/10.3769/radioisotopes.69.365","url":null,"abstract":"Herein, we present the case study of the decontamination of highly activated concrete in the accelerator room. The activated cyclotron room for pharmaceutical for the positron emission tomography (PET) in the Medical and Pharmacological Research Center Foundation (Ishikawa, Japan) was decontaminated. The contact dose rates of the concrete walls, floor, and ceiling were measured at 50 cm mesh using a NaI survey meter. The depth profiles of spe cific activity in the concretes were obtained by core boring at seven different places. The activated concrete regions were estimated in detail based on the relationship between the measured contact dose rates and depth profiles of the specific activity. The activated concrete was chipped and","PeriodicalId":20809,"journal":{"name":"Radioisotopes","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83672518","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}
Pub Date : 2020-12-15DOI: 10.3769/radioisotopes.69.375
H. Tanooka, 田ノ岡宏
{"title":"Recollections from the 50-Year History of Tokyo RBC—Period of Initiation—","authors":"H. Tanooka, 田ノ岡宏","doi":"10.3769/radioisotopes.69.375","DOIUrl":"https://doi.org/10.3769/radioisotopes.69.375","url":null,"abstract":"","PeriodicalId":20809,"journal":{"name":"Radioisotopes","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89047253","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}
Pub Date : 2020-11-15DOI: 10.3769/radioisotopes.69.353
K. Tagami, S. Uchida
{"title":"Major Factors Affecting Weathering Half-lives of Iodine-131 and Radiocaesium in Leafy Vegetables Directly Contaminated by Fukushima Dai-ichi Nuclear Power Plant Accident Fallout (2) Comparison of the Weathering Half-Lives Observed for Herbaceous Plants After the Chernobyl and the Fukushima Nuclear A","authors":"K. Tagami, S. Uchida","doi":"10.3769/radioisotopes.69.353","DOIUrl":"https://doi.org/10.3769/radioisotopes.69.353","url":null,"abstract":"","PeriodicalId":20809,"journal":{"name":"Radioisotopes","volume":"51 1","pages":"353-364"},"PeriodicalIF":0.0,"publicationDate":"2020-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83605461","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}
Pub Date : 2020-10-15DOI: 10.3769/radioisotopes.69.315
H. Tsuji, S. Takechi, H. Ozaki, Tatsuhiro Nishikiori, T. Kubota, S. Hayashi
We examined fluctuations of dissolved 137 Cs concentration in the constant temperature storage of unfiltered water samples from forest rivers, urban rivers and agricultural reservoirs. When the water was acidified im mediately after sampling, the dissolved 137 Cs concentration during the 30-day storage period increased from the in situ concentration. The dissolved 137 Cs concentration without acid varied depending on the storage temperature, number of storage days, and the nature of the water. The findings suggest that it is possible to reproduce the in situ dissolved 137 Cs concentration by restoring the water temperature to that of the originally sampled water after a short period storage of refrigeration prior to filtration.
{"title":"Effect of Storage Temperature and Duration of Environmental Water on Dissolved 137Cs Concentration","authors":"H. Tsuji, S. Takechi, H. Ozaki, Tatsuhiro Nishikiori, T. Kubota, S. Hayashi","doi":"10.3769/radioisotopes.69.315","DOIUrl":"https://doi.org/10.3769/radioisotopes.69.315","url":null,"abstract":"We examined fluctuations of dissolved 137 Cs concentration in the constant temperature storage of unfiltered water samples from forest rivers, urban rivers and agricultural reservoirs. When the water was acidified im mediately after sampling, the dissolved 137 Cs concentration during the 30-day storage period increased from the in situ concentration. The dissolved 137 Cs concentration without acid varied depending on the storage temperature, number of storage days, and the nature of the water. The findings suggest that it is possible to reproduce the in situ dissolved 137 Cs concentration by restoring the water temperature to that of the originally sampled water after a short period storage of refrigeration prior to filtration.","PeriodicalId":20809,"journal":{"name":"Radioisotopes","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87313500","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}
Pub Date : 2020-10-15DOI: 10.3769/radioisotopes.69.329
T. Yano, 矢野恒夫, K. Hasegawa, 長谷川功紀, Tatsuhiko Sato, 佐藤達彦, M. Tatsumi, 巽光朗, T. Watabe, 渡部直史, Yuichiro Kadonaga, 角永悠一郎, K. Kabayama, 樺山一哉, K. Fukase, 深瀬浩一, A. Hachisuka, 蜂須賀暁子, Y. Hirabayashi, 平林容子, H. Fujii, 藤井博史, Y. Yonekura, 米倉義晴
1 QiSS-Targeted Alpha Therapy Research, Research Center for Nuclear Physics, Osaka University, 2 Center for Instrumental Analysis, Kyoto Pharmaceutical University, 3 Nuclear Science and Engineering Center, Japan Atomic Energy Agency, 4 Department of Radiology, Osaka University Hospital, 5 Department of Nuclear Medicine and Tracer Kinetics, Graduate School of Medicine, Osaka University, 6 Institute for Radiation Sciences, Osaka University, 7 Department of Chemistry, Graduate School of Science, Osaka University, 8 Division of Biochemistry, National Institute of Health Sciences, 9 Center for Biological Safety & Research, National Institute of Health Sciences, 10 Division of Functional Imaging, Exploratory Oncology Research and Clinical Trial Center, National Cancer Center † fam-yano@tcct.zaq.ne.jp
{"title":"Rationale for Translational Research on Targeted Alpha Therapy in Japan —Renaissance of Radiopharmaceuticals Utilizing Astatine-211 and Actinium-225—","authors":"T. Yano, 矢野恒夫, K. Hasegawa, 長谷川功紀, Tatsuhiko Sato, 佐藤達彦, M. Tatsumi, 巽光朗, T. Watabe, 渡部直史, Yuichiro Kadonaga, 角永悠一郎, K. Kabayama, 樺山一哉, K. Fukase, 深瀬浩一, A. Hachisuka, 蜂須賀暁子, Y. Hirabayashi, 平林容子, H. Fujii, 藤井博史, Y. Yonekura, 米倉義晴","doi":"10.3769/radioisotopes.69.329","DOIUrl":"https://doi.org/10.3769/radioisotopes.69.329","url":null,"abstract":"1 QiSS-Targeted Alpha Therapy Research, Research Center for Nuclear Physics, Osaka University, 2 Center for Instrumental Analysis, Kyoto Pharmaceutical University, 3 Nuclear Science and Engineering Center, Japan Atomic Energy Agency, 4 Department of Radiology, Osaka University Hospital, 5 Department of Nuclear Medicine and Tracer Kinetics, Graduate School of Medicine, Osaka University, 6 Institute for Radiation Sciences, Osaka University, 7 Department of Chemistry, Graduate School of Science, Osaka University, 8 Division of Biochemistry, National Institute of Health Sciences, 9 Center for Biological Safety & Research, National Institute of Health Sciences, 10 Division of Functional Imaging, Exploratory Oncology Research and Clinical Trial Center, National Cancer Center † fam-yano@tcct.zaq.ne.jp","PeriodicalId":20809,"journal":{"name":"Radioisotopes","volume":"110 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80455524","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}
Pub Date : 2020-09-15DOI: 10.3769/RADIOISOTOPES.69.287
Takashi Yamada, M. Asai, C. Yonezawa, K. Kakita, S. Hirai
The Japan Society for Analytical Chemistry conducted ʻ The Collaborative Experiment on a Correction of the True Coincidence Summing Effect for 134 Cs ʼ to investigate the causes of the underestimation of 134 Cs radio-activity of the certified reference material in the International Inter-Comparison Exercise. This work examined the analysis results of the collaborative experiment, and confirmed that it is the cause of the underestimation that the true coincidence summing (TCS) correction is not sufficient because the TCS correction of using com mercial gamma ray analysis programs do not consider the sample volume. This work developed and proposed the practical TCS correction method for general Ge detectors that considers the sample volume and examined the effectiveness of the method and confirmed that the underestimation can be reduced to less than 1 ％ .
{"title":"True Coincidence Summing Correction for Cylindrical Volume Samples in γ-ray Spectrometry","authors":"Takashi Yamada, M. Asai, C. Yonezawa, K. Kakita, S. Hirai","doi":"10.3769/RADIOISOTOPES.69.287","DOIUrl":"https://doi.org/10.3769/RADIOISOTOPES.69.287","url":null,"abstract":"The Japan Society for Analytical Chemistry conducted ʻ The Collaborative Experiment on a Correction of the True Coincidence Summing Effect for 134 Cs ʼ to investigate the causes of the underestimation of 134 Cs radio-activity of the certified reference material in the International Inter-Comparison Exercise. This work examined the analysis results of the collaborative experiment, and confirmed that it is the cause of the underestimation that the true coincidence summing (TCS) correction is not sufficient because the TCS correction of using com mercial gamma ray analysis programs do not consider the sample volume. This work developed and proposed the practical TCS correction method for general Ge detectors that considers the sample volume and examined the effectiveness of the method and confirmed that the underestimation can be reduced to less than 1 ％ .","PeriodicalId":20809,"journal":{"name":"Radioisotopes","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82865819","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}
Pub Date : 2020-09-15DOI: 10.3769/radioisotopes.69.299
K. Oishi, Takayuki Enomoto, Syunki Sato, T. Morohashi, Naoto Miyamoto, N. Kano, H. Imaizumi, Naoki Watanabe
{"title":"Characteristics of Lagoon Water Systems and Precipitation in Niigata City in Recent Years from Oxygen and Hydrogen Stable Isotope Ratios (δ18O, δD), Tritium (T) Concentration and Various Ion Concentrations","authors":"K. Oishi, Takayuki Enomoto, Syunki Sato, T. Morohashi, Naoto Miyamoto, N. Kano, H. Imaizumi, Naoki Watanabe","doi":"10.3769/radioisotopes.69.299","DOIUrl":"https://doi.org/10.3769/radioisotopes.69.299","url":null,"abstract":"","PeriodicalId":20809,"journal":{"name":"Radioisotopes","volume":"51 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78846657","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}
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