RADIOISOTOPES
Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303
Volume 60 , Issue 11
Showing 1-5 articles out of 5 articles from the selected issue
Articles
  • Lidi GAO, Naoki KANO, Yoshimasa HIGASHIDAIRA, Yoshikazu NISHIMURA, Ryo ...
    2011 Volume 60 Issue 11 Pages 443-459
    Published: 2011
    Released: November 29, 2011
    JOURNALS OPEN ACCESS
    In order to investigate the behavior and distribution of metallic elements including rare earth elements(REEs), thorium(Th) and uranium(U) in the agricultural field, these elements in agricultural soils were partitioned into 6 fractions by a sequential extraction procedure:water soluble(F1), exchangeable(F2), bound to inorganic matter(F3), bound to organic matter(F4), bound to free oxides(F5) and residual(F6) fractions, and determined for each fraction as well as for total amount. Soil samples were collected from the agricultural field (paddy and upland field) and non-agricultural field in Sakata City (from 2005 to 2010) and Murayama City (from 2008 to 2010) in Yamagata Prefecture, and Sekikawa Village, Iwafune District(from 2007 to 2010) in Niigata Prefecture.
    Consequently, the following matters have been mainly clarified. (1) The distribution proportion of metallic elements among six fractions of the soils are varied depending on elements and soil utilization(i.e., paddy, upland or no plow). Among REEs, the tendency that the proportion of F5 of heavy-REE(HREE) is generally larger than that of light-REE(LREE) or in middle-REE(MREE) can be found. (2) The differences of REEs concentrations(or REE pattern) of soils are observed among sampling points. It can be related to the nature of soil including the content of Fe-Mn oxides or organic carbon(i.e., the affinity for free oxides or organic matter). (3) The distribution proportion as well as total concentrations of metallic elements in soils are not greatly varied regardless of sampling period(i.e., spring or autumn).
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  • Masaya KAWASE, Jyunji YAMAKAWA, Miyoko OSHIMA, Masayuki KUROKUZU, Shot ...
    2011 Volume 60 Issue 11 Pages 461-465
    Published: 2011
    Released: November 29, 2011
    JOURNALS OPEN ACCESS
    The state of Fe in epidote from Osayama area, Niimi City, Okayama Prefecture, Japan, was investigated by Mössbauer spectroscopy. Chemical composition analyses by EPMA proved that chemical composition of sample was Ca2.2(Al2.4, Fe0.4)2.8Si3.0O12.0(OH)1.0.
    Single crystal X-ray analysis showed that the sample has a typical epidote structure(P21/m). From the Mössbauer spectrum of the sample, chemical state of Fe in lattice splits into 3 states, two being Fe3+, and one Fe2+. Analysis of the spectrum also suggested that the octahedral Fe3+ into two sites, M3 and M3', and that Fe is not distributed in M1 site. The result suggests that the paleotemperature of rock belt containing the sample is about 200°C.
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Note
Materials(Date)
  • Toshiaki SASAKI, Koichiro SERA, Keizo ISHII
    2011 Volume 60 Issue 11 Pages 473-486
    Published: 2011
    Released: November 29, 2011
    JOURNALS OPEN ACCESS
    There are several guidelines for PET performance evaluation. Most of them require a lot of time and strict conditioning. Here we selected 5 items from the guidelines with some adjustments on which we evaluate and compare PET performances of seven facilities for the purpose of clarifying why and how PET quantitative values are different among facilities. The results show that the data vary even with the same type of PET machine when the image reconstruction method is different. This suggests that the terms of data reconstruction have to be considered as well as the difference of PET performance when we refer PET data of other facilities for clinical purpose.
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Serial Lecture
Current Perspectives of Radiation Therapy
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