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Volume 62, Issue 2
Displaying 1-8 of 8 articles from this issue
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Articles
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Tomoyasu NAKANO, Akira OHBA, Shinobu ONODA, Shinji OHSUKA2013 Volume 62 Issue 2 Pages 65-71
Published: 2013
Released on J-STAGE: February 28, 2013
JOURNAL OPEN ACCESSWe developed an X-ray fluorescence analyzer using a line-focus X-ray optical element. This X-ray optical element uses X-ray total reflection and can irradiate X-ray in high efficiency to samples such as fiber. We analyzed hair samples using this device, with the result that we were able to measure the quantities of calcium which changed from hair root to tip of hair.View full abstractDownload PDF (3643K) -
Akiyo MIZUTANI, Koichi OGUMA, Masanori FUJINAMI2013 Volume 62 Issue 2 Pages 73-82
Published: 2013
Released on J-STAGE: February 28, 2013
JOURNAL OPEN ACCESSThe applicability of inductively coupled plasma quadrupole mass spectrometry (ICP-QMS) has been investigated to the discrimination of low-alpha lead raw materials for electronics material. The experimental conditions for ICP-QMS were first optimized to improve the precision of isotope ratio measurement of lead materials. The lead isotope ratios of NIST SRM981 measured by an ICP-QMS under the optimized conditions agreed with those obtained by high precision mass spectrometers, thermal ionization mass spectrometer or multiple collector inductively coupled plasma mass spectrometer within the range of statistical errors. The relationship between the isotope ratios and alpha dose rates measured for six types of lead raw materials in various quality produced by different refining methods revealed that the leads examined here were divided into four groups. The low-alpha lead raw material showed a peculiar isotope ratio and was found to be discriminable by ICP-QMS.View full abstractDownload PDF (6090K)
Letter
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Yoshiya SHIRAKI, Hajime TAKEDA, Tamotsu OKAMOTO, Hideto FUNAHASHI, Nob ...2013 Volume 62 Issue 2 Pages 83-89
Published: 2013
Released on J-STAGE: February 28, 2013
JOURNAL OPEN ACCESSWe conducted this study to understand the relation of 137Cs concentration of the first crop of processed tea and that of its extracts manufactured in Kanagawa Prefecture in 2012.
In the case of the first crop, processed tea was brewed in 30 times its volume in hot water (at 90°C) for 1 minute, the 137Cs concentration of processed tea extracts was diluted to 1/68.9 that of processed tea on average and extraction efficiency of 137Cs from processed tea was 46.2% on average. The correlation coefficient between 137Cs concentration of the first crop of processed tea and that of extracts was 0.799(p<0.01).
Furthermore, the relation of 137Cs concentration of the first and second crops of processed tea was analyzed. The 137Cs concentration of the second crop of processed tea was 0.69 compared with that of the first crop of processed tea on average. The correlation coefficient between 137Cs concentration of the first and second crop of processed tea was 0.803(p<0.01).View full abstractDownload PDF (3872K)
Materials(Data)
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Masaaki MORITA, Fumiaki TSUNOMORI, Ryotaro MATSUYAMA, Toshiya MORI2013 Volume 62 Issue 2 Pages 91-95
Published: 2013
Released on J-STAGE: February 28, 2013
JOURNAL OPEN ACCESSRadon-222 concentrations in groundwater were surveyed along active faults in Miura Peninsula. A mean value of radon concentrations was 5.8±4.8BqL−1, which was slightly higher than a background level of 3±2Bq L−1 in Shonan area, Kanagawa Prefecture. The highest value was 17.2±1.0Bq L−1 at Iwato town, Yokosuka City. A few groundwater samples provided higher values of radon concentration relative to the background. In addition, a radon concentration profile, which was plotted against to a distance between a sampling point and a fault line, showed a low radon concentration zone on the fault line surrounded by high radon concentration zones. Since there is no big river in Miura Peninsula, it is presumed that the high radon concentration zone indicates the existence of fracture zones along active faults.View full abstractDownload PDF (2708K)
Review Article
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Ayato KOHZU2013 Volume 62 Issue 2 Pages 97-103
Published: 2013
Released on J-STAGE: February 28, 2013
JOURNAL OPEN ACCESSMeasurement of carbon and nitrogen isotope ratios (δ13C, δ15N) has been applied in various environmental researches such as ecology and biogeochemistry. Environmental research by carbon and nitrogen isotope ratios could be classified into three subjects.
1)Source and its contribution analysis
2)Analysis of the reactions with isotope fractionation
3)Estimation of chemical equilibrium by the isotope exchange equilibrium
Most of the research using isotope ratios would belong to subject 1). By summarizing my research examples and related papers, I would like to introduce the characteristics of the environmental research using natural isotope ratios.View full abstractDownload PDF (4928K)
Serial Lecture
Basics and Applications of Mössbauer Spectrometry
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Takateru KAWAKAMI2013 Volume 62 Issue 2 Pages 105-118
Published: 2013
Released on J-STAGE: February 28, 2013
JOURNAL OPEN ACCESSHigh-pressure Mössbauer spectroscopy is able to study magnetism at ultrahigh-pressure (over 100GPa). Here we explain an experimental methodology for high-pressure Mössbauer spectroscopy using a diamond anvil cell. Moreover, in addition to low temperature and magnetic field essential to solid-state physics, we discuss high-pressure Mössbauer spectroscopy of composite ultimate environment. Finally, we give an introduction to the square‐planar coordinated iron oxide, SrFeO2, as a new class of spin transition.View full abstractDownload PDF (8548K)
Mini Review
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Masato BABA, Yoshihiro SHIRAIWA2013 Volume 62 Issue 2 Pages 119-122
Published: 2013
Released on J-STAGE: February 28, 2013
JOURNAL OPEN ACCESSDownload PDF (2585K)
Erratum
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Shugo WATABE, Yoko MATSUOKA, Misako NAKAYA, Hideki USHIO, Yoshiharu NE ...2013 Volume 62 Issue 2 Pages 123
Published: 2013
Released on J-STAGE: February 28, 2013
JOURNAL OPEN ACCESSRadioactivities of several tissues of Pacific cod, nibe croaker, and white croaker captured around Fukushima were estimated with an imaging plate system. There were relatively high radioactivities in muscle. Effects of washing on residual Cs radioactivities in fish meat were estimated. Three-times washing with 0.1% NaCl solution was effective for the removal of radiocaesium from contaminated fish meat. Homogenization of meat was also effective for the removal of radiocaesium.View full abstractDownload PDF (350K)
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