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Volume 64, Issue 11
Displaying 1-6 of 6 articles from this issue
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Article
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Hidesuke ITADZU, Osamu KURIHARA, Tetsuo IGUCHI2015 Volume 64 Issue 11 Pages 661-671
Published: November 15, 2015
Released on J-STAGE: November 27, 2015
JOURNAL OPEN ACCESSThe self-absorption of large volume samples is an important issue in gamma-ray spectrometry using high purity germanium(HPGe) detectors. After the Fukushima Daiichi Nuclear Power Plant accident, a large number of radioactivity measurements of various environmental samples have been performed using 1000 cm3 containers. This study uses Monte Carlo simulations and a semiempirical function to address the self‐absorption correction factor for the samples in the 1000 cm3 Marinelli container that has been widely marketed after the accident. The presented factor was validated by experiments using test sources and was shown to be accurate for a wide range of linear attenuation coefficients μ(0.05 - 1.0 cm－1). This suggests that the proposed correction factor is applicable to almost all environmental samples. In addition, an interlaboratory comparison where participants were asked to determine the radioactivity of a certified reference material demonstrated that the proposed correction factor can be used with HPGe detectors of different crystal sizes.View full abstractDownload PDF (6007K)
Note
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Tomonori SUGIMOTO, Yumiko IWASE, Nagahiko YUMITA, Koji CHIBA, Hiroshi ...2015 Volume 64 Issue 11 Pages 673-679
Published: November 15, 2015
Released on J-STAGE: November 27, 2015
JOURNAL OPEN ACCESSBefore conducting human study on radiolabeled drug, internal radiation dose is evaluated based on the animal data. Generally, however, species difference in the elimination process of radioactivity, mostly in the hepatic metabolism, is ignored. The methodology of correction was described for drugs that are eliminated mostly by hepatic metabolism. We showed the validity of using the method where the hepatic clearance in animal and human are constructed by the hepatic blood flow, protein unbound fraction and metabolic rate in vitro, and the internal radiation exposure calculated is corrected by the animal/human ratio of the hepatic clearance.View full abstractDownload PDF (4296K)
Letter
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Hisaya MATSUNAMI, Moono SHIN, Yoshihiko TAKAHASHI, Shiori KITAJIMA, Ta ...2015 Volume 64 Issue 11 Pages 681-686
Published: November 15, 2015
Released on J-STAGE: November 27, 2015
JOURNAL OPEN ACCESSAfter the TEPCO Fukushima Dai-ichi Nuclear Power Plant accident in 2011, the radiocaesium, which flowed into the paddy fields via irrigation water, have been widely investigated. When the concentration of radiocaesium in the water samples containing suspended solids were directly measured using a high purity germanium detector with a 2L marinelli beaker, the radiocaesium concentration might be overestimated due to the sedimentation of the suspended solids during the measurement time. In fact, the values obtained by the direct method were higher than those obtained by the filtering method and/or the gelling method in most of the agriculture-related water samples. We concluded that the gelling method using sodium polyacrylate can be widely adapted for the analysis of the total radiocaesium in the agriculture-related water samples because of its many advantage such as simple preparation procedure, accurate analysis values, excellent long-term stability of geometry and low operating cost.View full abstractDownload PDF (3978K)
Technical Report
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Kaoru YOKOYAMA, Haruhi HATA, Masaki NAGANUMA, Yoshiyuki OHARA, Yuu ISH ...2015 Volume 64 Issue 11 Pages 687-696
Published: November 15, 2015
Released on J-STAGE: November 27, 2015
JOURNAL OPEN ACCESSThe authors developed a new analysis technique(hereinafter referred to as the equivalent model) which calculates the amount of uranium by correcting the influence of uneven distribution of the uranium. The gamma rays(766keV, 1001keV) emitted from Pa-234m are used in the equivalent model. The quantity error is decided by the gamma ray with the small counting rate. The way to get the high counting rate is considered to reduce the quantity error. Many gamma rays are scattered by the Compton effect in radioactive waste. We applied the scattered gamma ray with the high count rate to equivalent model. As a result, it becomes possible to reduce the quantity error of uranium quantitative determination.View full abstractDownload PDF (5591K)
Serial Lectures
Muon Science
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Ryosuke KADONO2015 Volume 64 Issue 11 Pages 697-705
Published: November 15, 2015
Released on J-STAGE: November 27, 2015
JOURNAL OPEN ACCESSThe muon spin rotation(μSR) is introduced as a quantum beam-based experimental technique that enjoys wide recognition as a powerful tool for investigating the local electronic state over the atomic scale in the fields of condensed matter physics and material science. In particular, selected examples of muon spin relaxation function that are often observed in actual experiments are brought under closer scrutiny to elaborate how one can extract information on the relevant electronic state from the magnitude and fluctuation rate of the internal magnetic field probed by muon.View full abstractDownload PDF (5724K)
Neutron Scattering Study on Dynamics of Atomic and Molecular Motions
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Yasuo ENDOH2015 Volume 64 Issue 11 Pages 707-715
Published: November 15, 2015
Released on J-STAGE: November 27, 2015
JOURNAL OPEN ACCESSChapter V is mainly focused to present several unique phenomena initiated by the spatial dimensions as well as crystal symmetry, and sometimes uncommon crystal structure with quantum versus classical spin effects. For the readers' convenience, the introduction section is prepared by stressing how the neutron magnetic scattering provides so valuable information to understand the spin dynamics. The format of this section is as follows:the neutron magnetic scattering cross-section is given in terms of the quantum mechanical expression, which leads straightforwardly to the dynamical(wave vector) dependent magnetic susceptibility and finally the principle of the neutron spectrometers currently usable is illustrated.View full abstractDownload PDF (5448K)
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