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Volume 59, Issue 10
Displaying 1-5 of 5 articles from this issue
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Articles
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Yoshinori KOBAYASHI, Toshiko TAKATSUKA, Ryoichi SUZUKI, Yoshihisa ISHI ...2010 Volume 59 Issue 10 Pages 581-586
Published: 2010
Released on J-STAGE: October 29, 2010
JOURNAL OPEN ACCESSApplicability of a cold cathode X-ray generator using a nanostructured carbon electron emitter to energy-dispersive X-ray fluorescence spectrometry was studied by using standard reference materials and certified reference materials for chemical analysis. It was found that X-ray fluorescence spectrometry with the cold cathode X-ray generator enables the identification of different alloys, quantitative analysis of bromide flame retardants, and of heavy metals in organic polymers and resins. It is expected that the use of a cold cathode X-ray generator, being of no necessity of preheating or aging of a filament, will lead to the development of a compact X-ray fluorescence spectrometer with improved energy efficiency and of easy operation.View full abstractDownload PDF (1180K) -
Keisuke TSUDA, Tatsuya SASAKI, Yuto IWABUCHI, Kouichi NEMOTO, Noriyuki ...2010 Volume 59 Issue 10 Pages 587-598
Published: 2010
Released on J-STAGE: October 29, 2010
JOURNAL OPEN ACCESSBreath-hold imaging has been performing more frequently to reduce the respiratory motion artifact in chest imaging by means of positron emission tomography (PET) using 2-deoxy-2-[18F]-fluoro-D-glucose(FDG). It is difficult to hold breath for 30 seconds or more. We evaluated an experimental breath-holding image acquisition using phantoms with regard to pulmonary nodule detection on chest FDG PET image to examine whether the total acquisition time could be reduced. Images obtained during 180 seconds of continuous movement were compared with static images recorded during 60 - 180 seconds (15 seconds×4, 6, 8, 10, 12 times). Although shorter acquisition times resulted in greater variability in background activity, images recorded under static conditions for 90 seconds (15 seconds×6 times) or less showed nodules that were smaller than those observable in images recorded during continuous movement for 180 seconds. Breath-holding therefore permits the detection of smaller nodules on chest FDG PET images at shorter acquisition times.View full abstractDownload PDF (2940K) -
Masanobu HORIE, Mashiho YANAGI, Shigeo BABA, Yuka KATO, Tomoyuki YOSHI ...2010 Volume 59 Issue 10 Pages 599-605
Published: 2010
Released on J-STAGE: October 29, 2010
JOURNAL OPEN ACCESSThe intra-day, inter-day and individual variations in endogenous 14C radioactivity of human urine were studied by use of 5mL urine. The endogenous 14C radioactivity of human urine is relatively constant(approximately1.5dpm/mL urine). In order to eliminate the effect of endogenous 40K it is of the greatest importance to count 14C signal with the optimal window. Since these variations are relatively small, we can estimate correctly the net 14C activity from the BG value of the same time zone of the day before dosing.View full abstractDownload PDF (972K) -
Hiromi KAMEYA, Daisuke KAKITA, Yoshihiko KAIMORI, Masahiro KIKUCHI, Ya ...2010 Volume 59 Issue 10 Pages 607-614
Published: 2010
Released on J-STAGE: October 29, 2010
JOURNAL OPEN ACCESSMangoes are imported to Japan after treated with hot water. Recently, irradiated mangoes imported to U. S. are widely used. This paper reports on the ESR method for analyzing the radiation induced radicals of irradiated mangoes. Upon the γ ray irradiation, a strong single peak in the flesh and skin of mangoes was observed at g=2.004. This singlet peak may be attributed to organic free radicals. The ESR spectra of the flesh and skin of mangoes showed the radiation induced radicals due to cellulose by irradiation over 12kGy. The relaxation times(T1 and T2) of the singlet signal were calculated. T2 showed dose response according to increasing the irradiation dose levels, while T1 was almost constant. The value of (T1T2)1/2 showed the dependence of irradiation dose level.View full abstractDownload PDF (1266K)
Serial Lecture
Fundamentals and Applications of Neutron Diffraction(Applications24)
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Stefanus HARJO, Kazuya AIZAWA, Takayoshi ITO, Hiroshi ARIMA2010 Volume 59 Issue 10 Pages 615-622
Published: 2010
Released on J-STAGE: October 29, 2010
JOURNAL OPEN ACCESSEngineering diffraction is a diffraction method to measure elastic strains (stresses), grain sizes and/or dislocations, texture and other engineering parameters, from accurate measurements and analyzes of peak position, peak broadening, peak intensity, etc. Neutron diffraction is a powerful tool to obtain such information as that of an inside part or as an average of a whole part, since neutrons have high penetration abilities. A dedicated neutron diffractometer to carry out engineering diffraction, called “TAKUMI” has been constructed at J-PARC and has been completed at the end of 2009 fiscal year. The commissioning to clarify the performances has almost finished and general uses have been started. TAKUMI was found to have not only a high resolution Δd/d of less than 0.2%, but also a wide d-spacing of 0.05nm < d < 0.47nm, and also applying an event data recording method that is very powerful for time-slicing observation. Many scientific and/or industrial results with high impacts herewith are anticipated to be achieved by using TAKUMI.View full abstractDownload PDF (1272K)
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