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Volume 48, Issue 4
Displaying 1-8 of 8 articles from this issue
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Hiroyuki TACHIBANA, Takuji KOJIMA, Noriyuki HANEDA, Hirohisa KANEKO, K ...1999 Volume 48 Issue 4 Pages 247-256
Published: April 15, 1999
Released on J-STAGE: March 10, 2011
JOURNAL FREE ACCESSThe 60Co gamma-ray irradiation facility for high absorbed dose calibration at radiation processing dose level was originally designed and constructed in JAERI. Uncertainty in absorbed dose given at JAERI was estimated by reviewing its characteristics and dosimetry performance. Dosimeter calibration equipment consists of the two plaque 60Co gamma-ray radiation sources giving different dose rate range of 5-200 Gy/h and 400 Gy/h-20 kGy/h, a dosimeter holder stage with high-reproducible positioning, a parallel plate ionization chamber for accurate measurement of exposure-rates, and an auxiliary temperature/humidity-controlled irradiation vessel for dosimeter calibration under specific irradiation condition. The characteristics of the irradiation field and dosimetry performance are sufficient to give a known dose to working dosimeters to be calibrated for absorbed doses in the range of 0.5 Gy to 160 kGy within a reasonable operation time, 8 h, with an uncertainty of ±2.2% at a 95% confidence level. Calibration of dosimeters giving known doses by transfer dosimetry employing alanine dosimeters calibrated at JAERI is also achievable with an uncertainty of ±3.4% at a 95% confidence level.View full abstractDownload PDF (1154K) -
Masaaki SAITO1999 Volume 48 Issue 4 Pages 257-262
Published: April 15, 1999
Released on J-STAGE: March 10, 2011
JOURNAL FREE ACCESSA new radon measurement, absorptive polymer dissolved liquid scintillation counting, was developed. A polystyrene foam absorber which absorbed radon was dissolved in liquid scintillator, and the radioactivity was measured. This measurement has merits that, (1) solid state absorber has no chemical hazard, and is easy to treat, (2) the absorber itself is easily dissolved in liquid scintillator, and maintains ideal condition for liquid scintillation counting The measurement will be available for liquid state or gas state. The time to reach the equilibrium was 24 h for a cross section 10×10 mm polystyrene foam. Absorbed radioactivity was proportional to the mass of polystyrene foam and to the partial pressure of radon. Absorbed radon activity of polystyrene foam was 130 times that of water, or 2.6 times that of toluene. Although the accuracy is less than the toluene extraction method, quantitative measurement is suitable not only to radon but to other radioisotope gases.View full abstractDownload PDF (674K) -
Hisaki KOFUJI, Masayoshi YAMAMOTO1999 Volume 48 Issue 4 Pages 263-265
Published: April 15, 1999
Released on J-STAGE: March 10, 2011
JOURNAL FREE ACCESSUranium concentrations in some natural mineral waters sold in Japan (domestic 20 and foreign 9) were measured by ICP-MS. The U concentrations were found in a wide range, differing by a factor of 40000, about 0.4-1.6×104ng/l. The values over guidance level (2μg/1) were observed in two domestic samples and one foreign one. Occurrence of such a high U concentration indicates the need of further survey of U concentration of mineral water to consider uranium intake.View full abstractDownload PDF (239K) -
—With Special Reference to the Factors Affecting Concentration of 137Cs in Marine Fish-Fujio KASAMATSU1999 Volume 48 Issue 4 Pages 266-282
Published: April 15, 1999
Released on J-STAGE: March 10, 2011
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Yukio CHIKAYAMA, Yukio YAGI, Hiroki SHIONO, Atsushi WATANABE, Toru MIY ...1999 Volume 48 Issue 4 Pages 283-287
Published: April 15, 1999
Released on J-STAGE: March 10, 2011
JOURNAL FREE ACCESSDownload PDF (361K) -
Minoru TANAKA, Akiyo SHIGEMATSU, Shin-ichiro NAGATSUKA, Eiichi NAKAJIM ...1999 Volume 48 Issue 4 Pages 288-298
Published: April 15, 1999
Released on J-STAGE: March 10, 2011
JOURNAL FREE ACCESSDownload PDF (4090K) -
Technical Committee for Using Minor Radioactive1999 Volume 48 Issue 4 Pages 299-307
Published: April 15, 1999
Released on J-STAGE: March 10, 2011
JOURNAL FREE ACCESSDownload PDF (872K) -
[in Japanese]1999 Volume 48 Issue 4 Pages 309-312
Published: April 15, 1999
Released on J-STAGE: March 10, 2011
JOURNAL FREE ACCESS
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