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Volume 55, Issue 8
Displaying 1-8 of 8 articles from this issue
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Tomoko NAKANO-OHTA, Jun SATO2006 Volume 55 Issue 8 Pages 443-449
Published: August 15, 2006
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSDetermination procedure for concentration of 226Ra and 228Ra in seawaters was developed. The 226Ra in seawaters was collected in-situ on Mn-impregnated acrylic fiber which was packed into a plastic column and was determined by y-ray spectrometry in the laboratory. Concentration of 228Ra which is low in seawaters was obtained by the 226Ra concentration and the 228Ra/226Ra activity ratio observed simultaneously with the Mn-impregnated acrylic fiber by placing in the seawater for a few days at the identical sampling point for 226Ra.View full abstractDownload PDF (638K) -
Hiromi KAMEYA, Mitsuko UKAI2006 Volume 55 Issue 8 Pages 451-455
Published: August 15, 2006
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSUsing electron spin resonance (ESR) spectrometry, we revealed the presence of radical species in γ ray irradiated ginseng and developed a quantitative detection method of dose levels. The ESR spectrum of ginseng consisted of a sharp and strong singlet signal at g=1.992 due to an organic free radical, hyperfine signals of Mn2+ ion and a singlet from Fe3+ ion. Upon γ ray irradiation, the signal intensity of organic free radical was increased. Also, a new ESR signal was detected in the vicinity of g=2.0 region. After irradiation, new four radical species were identified in the irradiated ginseng. A linear relationship was found between the ESR intensity and the irradiation dosage of ginseng. Using the nonlinear least squares method, the unknown dosage of the ginseng sample was estimated as 4 kGy by the extrapolated value.View full abstractDownload PDF (444K) -
Yukinori NARAZAKI, Tetsuo ISHIKAWA, Shinji YOSHINAGA, Masahide FURUKAW ...2006 Volume 55 Issue 8 Pages 457-467
Published: August 15, 2006
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSWe described the relationship between the radon concentration in household water and the airborne radon concentration for houses at Shikaka area in Fukuoka Prefecture. The radon concentration in household water ranged from 36 to 130 Bq/L. Of these, the arithmetic mean of radon concentration of tap water from a small scale public water supply was 43 Bq/L, that of private well water was 100 Bq/L. For all samples, radon concentrations were between the MCL and the AMCL (USEPA proposed regulation now) . Indoor radon concentrations ranged from 4.5 to 46 Bq/m3 (arithmetic mean : 14 Bq/m3), were not found to exceed of action guideline of USEPA. While outdoor radon concentrations ranged from 2 to 7.5 Bq/m3 (arithmetic mean : 4 Bq/m3) .
The radon concentration in the atmosphere was not so different from the nationwide mean concentration in Japan. The incremental airborne radon concentration volatiled from the water was estimated to be from 3.6 to 13 Bq/m3. Although radon concentration in bathrooms seemed to be elevated by water use, there was little influence to other rooms. The annual effective dose equivalent to the population for radon was calculated with the dose conversion factor from the UNSCEAR 2000 report. It was estimated to be 0.44 mSv/y. It could be concluded that the average radon levels in the household water at Shikaka area do not contribute to any additional radiological risk to the population.View full abstractDownload PDF (1238K) -
Kenji ITO, Yoshinori KOBAYASHI2006 Volume 55 Issue 8 Pages 469-472
Published: August 15, 2006
Released on J-STAGE: March 01, 2011
JOURNAL FREE ACCESSWe assessed usefulness of commercially available sealed 22Na positron sources for positron annihilation lifetime measurements. Three sources with different nominal activities below 1.85 MBq were adopted for measuring positron annihilation lifetimes in silicon and annealed copper. It was found that all the sources have long lifetime components over 1 ns with different relative intensities of several percents. The result suggests that care should be taken in the analysis of the positron annihilation lifetime data obtained with these sources.View full abstractDownload PDF (3082K) -
II. State-of-the-art Automated Methods for Radiosynthesis of Positronemitting CompoundsRen IWATA2006 Volume 55 Issue 8 Pages 473-484
Published: August 15, 2006
Released on J-STAGE: July 21, 2010
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Toshiaki ISHII, Tomofumi SAKURAGI2006 Volume 55 Issue 8 Pages 485-494
Published: August 15, 2006
Released on J-STAGE: July 21, 2010
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IV. Imaging Technology Using MicrobeamsKeizo ISHII2006 Volume 55 Issue 8 Pages 495-500
Published: August 15, 2006
Released on J-STAGE: July 21, 2010
JOURNAL FREE ACCESSDownload PDF (504K) -
Measurement of Time Variations of Cosmic Rays in the Past by the Detection of Ultralow Level 14C and 7Be RadioactivityHirohisa SAKURAI2006 Volume 55 Issue 8 Pages 501-513
Published: August 15, 2006
Released on J-STAGE: July 21, 2010
JOURNAL FREE ACCESSDownload PDF (1584K)
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