RADIOISOTOPES

Online ISSN : 1884-4111
Print ISSN : 0033-8303
ISSN-L : 0033-8303

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Volume 44, Issue 1

Displaying 1-17 of 17 articles from this issue

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Adsorption of Th (IV), U (IV), Y (III), La (III), Pb (II) and Fe (III) in Low Concentration onto Filter Paper and Active Carbon

Yoshiaki SASAKI, Shoji TAGASHIRA, Yoshiko MURAKAMI, Isamu FUJIWARA, Ke ...

1995 Volume 44 Issue 1 Pages 1-9
Published: January 15, 1995
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.44.1

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The taking up of cations in low concentration by filter paper and active carbon was studied. Adsorption isotherms followed very closely Freundlich's adsorption isotherm in all cases. Effects of pH and concentration of coexistent salt on adsorption of cation in question onto active carbon were described by the experimental formula derived previously. Adsorption of Fe ( III) onto active carbon increases with increasing concentration of hydrochloric acid. An empirical formula was introduced for this phenomenon. Experimental results on the relation between activity of hydrochloric acid and adsorption ratio of Fe (III) onto active carbon can be explained well by this proposed formula. This formula is apparently identical with the formula derived previously, but its adsorption model is not clear.

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Measurement of Airborne Dispersing Ratio of ⁶⁰Co and ¹⁹²Ir Metals

Committee on Measurement of Airborne Dispersing

1995 Volume 44 Issue 1 Pages 10-18
Published: January 15, 1995
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.44.10

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The airborne dispersing ratios of ⁶⁰Co and ¹⁹²Ir metals were measured in model experiments, that simulated the conditions of actual operations to manufacture sealed radioactive sources of metal pellets.
The airborne dispersing ratio of ⁶⁰Co was determined to be less than 1.6×10^-8, and that of ¹⁹²Ir less than 8.0×10^-10. The size and distribution of the airborne dispersed particles were also estimated.

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Variation of Cosmic Ray Intensity with Altitude at Mt. Fuji

—Measurement of ionizing component with a spherical Nal (Tl) scintillator—

Masahide FURUKAWA, Masaki MATSUMOTO, Shinji TOKONAMI, Kazunobu FUJITAK ...

1995 Volume 44 Issue 1 Pages 19-22
Published: January 15, 1995
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.44.19

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Variation of cosmic ray intensity with altitude was measured at Mt. Fuji located at about 26°N on geomagnetic latitude on August 1994. The measurement was carried out with a spectrometer equipped with a 76.4 mm (3″) diameter spherical NaI (Tl) scintillator. Analysis was made for absorbed energy spectra above 3 Me V by the peeling-off method, and the cosmic ray intensity was calculated as the exposure rate from the ionizing component of the cosmic rays. The cosmic ray intensity increased with increasing altitude. The maximum (30.7×10^-10 C/kg/h) and minimum (8.5×10^-10 C/kg/h) values were observed at summit area of Mt. Fuji (3740 m) and near the sea level (about 20 m), respectively. Above 2500 m, the rate of change of cosmic ray intensity with altitude was estimated to be about 0.99×10^-12 (C/kg) /h/m. The rate from near the sea level to about 2 500 m was also estimated to be about 0.39×10^-12 (C/kg) /h/m.

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Characterization of Hexafluoroethane as a Counting Gas of a Position-sensitive Helium-3 Proportional Counter

Akira URITANI, Chizuo MORI

1995 Volume 44 Issue 1 Pages 23-27
Published: January 15, 1995
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.44.23

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This note describes the characteristics and the usefulness of hexafluoroethane, C₂F₆ as a counting gas of a position-sensitive ³He proportional counter. The gas multiplication property of a gas mixture of ³He and C₂F₆, and the usefulness of the gas mixture for improvement of the position resolution for thermal neutrons are presented. Though C₂F₆ was not suitable as a counting gas of a proportional counter, the addition of C₂F₆ improved the position resolution for thermal neutrons.

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Molecular Weight Determination of Bisbenzylisoquinoline Alkaloids by ²⁵²Cf-Plasma Desorption Mass Spectrometer

Hiroyuki KOHNO, Shinobu TATSUNAMI, Tomoko HIROI, Hiroshi KOUYAMA, Masa ...

1995 Volume 44 Issue 1 Pages 28-32
Published: January 15, 1995
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.44.28

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Bisbenzylisoquinoline alkaloids of Stephania cepharantha have been used for various clinical purposes and recently reevaluated as stimulators of interleukin secretion in tissues. We analyzed molecular structures of bisbenzylisoquinoline alkaloids by determining their molecular weights using the ²⁵²Cf-plasma desorption mass spectrometry (PDMS) . The spectra were accumulated for 500000 fission events. The acceleration voltage used here was 15kV. Samples were analyzed using nitrocellulose-coated sample targets. Of the 5 alkaloids studied here, cepharanthine gave a main peak of molecular weight of 606.1 for the theoretical molecular weight of 606.7. The other minor peaks were considered to be demethylated fragment ions.
²⁵²Cf-PDMS should be quite useful in studying structure, metabolism and pharmacokinetics of various drugs with extremely low coefficients of variation.

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Distribution of Neutron Component of Cosmic Rays with Altitude at Mt. Fuji

Masaki MATSUMOTO, Masahide FURUKAWA, Shinji TOKONAMI, Kazunobu FUJITAK ...

1995 Volume 44 Issue 1 Pages 33-34
Published: January 15, 1995
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.44.33

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Comparison between the Effects of Glow Discharge Plasma and γ-Ray on the Hydrogenation of Unsaturated Fatty Acid Esters

Kazuta KITAHARA, Sigeo KIDA, Yoshitaka NAKAYAMA

1995 Volume 44 Issue 1 Pages 35-37
Published: January 15, 1995
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.44.35

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Handling Technique of Spore-forming Bacteria in Radiation Sterilization (III)

A simple identification method for spore-forming bacteria

Tomihiko KOSHIKAWA

1995 Volume 44 Issue 1 Pages 38-49
Published: January 15, 1995
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.44.38

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Application of Radioisotopes to Therapies. VI. Current status of gamma-knif treatment as a new telecobalt therapy

Keiichi NAKAGAWA, Yukimasa AOKI, Masao TAGO, Yasuhito SASAKI, Hiroki K ...

1995 Volume 44 Issue 1 Pages 50-58
Published: January 15, 1995
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.44.50

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Fundamentals and Present Aspects of Ion Beam Technology I. Prologue

Yusuke UJIHIRA

1995 Volume 44 Issue 1 Pages 59-76
Published: January 15, 1995
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.44.59

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II. Basics for Ion Beam Utilization

1. Fundamentals for application of ion beam

Takeo OKI

1995 Volume 44 Issue 1 Pages 63-68
Published: January 15, 1995
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.44.63

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2. Radiation chemistry with heavy ion beams

Hideki NAMBA

1995 Volume 44 Issue 1 Pages 69-72
Published: January 15, 1995
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.44.69

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3. Ion Detectors

Masaharu NAKAZAWA

1995 Volume 44 Issue 1 Pages 73-76
Published: January 15, 1995
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.44.73

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[title in Japanese]

[in Japanese]

1995 Volume 44 Issue 1 Pages 77-78
Published: January 15, 1995
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.44.77

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[title in Japanese]

[in Japanese], [in Japanese]

1995 Volume 44 Issue 1 Pages 79-80
Published: January 15, 1995
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.44.79

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[title in Japanese]

[in Japanese], [in Japanese]

1995 Volume 44 Issue 1 Pages 81-82
Published: January 15, 1995
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.44.81

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[title in Japanese]

[in Japanese]

1995 Volume 44 Issue 1 Pages 83-84
Published: January 15, 1995
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.44.83

JOURNAL FREE ACCESS

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