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Hisao YAMAMOTO, Toshiyuki NORIMURA, Akira KATASE
1998 Volume 47 Issue 11 Pages
805-811
Published: November 15, 1998
Released on J-STAGE: September 07, 2010
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Concentrations of thorium and uranium are measured in the front glass of CRT (cathode ray tube) of television sets by the two methods of the γ-ray spectrometry and the neutron activation analysis. In the former method, measurements are made on an assumption of the radioactive equilibrium in the respective series of thorium and uranium. The concentrations obtained by the two different methods agree well within experimental uncertainties, showing the radioactive equilibrium in the present samples. It is found that the thorium and uranium concentrations in the glass can be measured by the γ-ray spectrometry as well as by the neutron activation analysis. Moreover, the concentrations of thorium are generally higher than those for uranium. This trend is consistent with that of the natural abundance for thorium and uranium in the earth's crust.
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Mitsuyoshi IKEDA, Sigeru TAKATA, Hiroharu MATSUEDA
1998 Volume 47 Issue 11 Pages
812-823
Published: November 15, 1998
Released on J-STAGE: September 07, 2010
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Tritium (
3H)
concentration and stable isotopic ratios δD
and δ
18O
are important environmental tracer data. In Hokkaido, however, hydrological studies using these data were difficult due to a lack of environmental tritium and the altitude isotope effect values. In this study,
3H
concentrations of Hokkaido wine were measured to estimate the past rain3H
concentrations. In addition, environmental δD
and δ
18O
samples taken on Mt. Daisetsuzan, the highest peak in Hokkaido, and in the Tokachi Plain were measured. The results obtained are as follows: Estimated concentrations of 3H
in Hokkaido were higher than those in Tokyo and Tsukuba, and were consistent with geographical 3H
levels in rain around Hokkaido. Some model calculations suggested that the 3H
concentrations in the 1950's and 1960's were at least 30% higher than those in Tokyo. The altitude isotope effects obtained were -1.75±0.30‰/100m and -0.24±0.01‰0/100m for δD
and δ
18O,
respectively. These values are almost the same as, or slightly lower than those in the Chubu and Tohoku districts. Using these data, the approximate age of groundwater and the altitude of original precipitation could be estimated.
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Misako MOTEGI, Sadaaki MIYAKE, Takashi OHSAWA, Kiyoaki NAKAZAWA, Yoshi ...
1998 Volume 47 Issue 11 Pages
824-829
Published: November 15, 1998
Released on J-STAGE: September 07, 2010
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Accumulation of 137Cs
in trefoil (leaf and stem), “Mitsuba”, Cryptotaenia japonica Hassk, with or without root was investigated to prepare higher radioactive plant in hydroponic culture medium (140-150 Bq/ml) .
It was found that 137Cs
concentration in plant tissue was increased with time, as high as 1.6 times of that in the culture medium after 4 days.On the other hand, 137Cs
concentration was affected by carrier element (Cs >
6ppm) and coexistent elements in the medium.Radioactivity of the plant after 4 days was shown to be sufficient for successive experiments.
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Hiroshi SHIBATA, Masahiro KOHNO
1998 Volume 47 Issue 11 Pages
830-836
Published: November 15, 1998
Released on J-STAGE: September 07, 2010
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The comparative study of the blood clearance tests of 99mTc-
Phytate (
99mTc-
P) and indocyanine green (ICG) was undertaken in liver-injured dogs with D-galactosamine (GaIN) .The blood clearances of 99mTc-
P and ICG in dogs decreased with the increase in dose of GalN and with the time elapsed after GalN administration. As compared with the blood clearance test of ICG, the blood clearance test of 99mTc-
P in dogs was found to be more sensitive in detection of the hepatic dysfunction with mildly damaged stage, but to be relatively inaccurate in detection of the hepatic dysfunction with severely damaged stage induced by GaIN.
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Taher SHARSHAR
1998 Volume 47 Issue 11 Pages
837-843
Published: November 15, 1998
Released on J-STAGE: September 07, 2010
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A NaI-NaI
coincidence low background counting system has been constructed to be used in radioenvironmental measurements. The slow timing technique, using the constant fraction timing single channel analyzer and coincidence unit, was used in the present system. The coincidence efficiencies of systems employing two and four NaI (Tl)
detectors have been evaluated. A scintillation preamplifier with multiple inputs was constructed for summing the outputs of PM tubes. The performance of the system was tested using radioactive point sources and environmental samples. The detection efficiency of the NaI-NaI
coincidence system employing four NaI (Tl)
detectors was found to be high enough to measure low-level γ-
ray activity of desired isotope in environmental samples with neither high background contribution nor interferences from other isotopes.
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Yasuhiro YAMAGUCHI
1998 Volume 47 Issue 11 Pages
844-854
Published: November 15, 1998
Released on J-STAGE: July 21, 2010
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Zenzaburo TOZUKA, Masahiro DOI, Eiji MIYAZAWA, Takeo KAWAKAMI
1998 Volume 47 Issue 11 Pages
855-863
Published: November 15, 1998
Released on J-STAGE: July 21, 2010
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1. Results of Questionnaires to the Scientists Using Radioluminographic Techniques
Norio KURIHARA, Eiichi NAKAJIMA, Sentaro TAKAHASHI
1998 Volume 47 Issue 11 Pages
864-871
Published: November 15, 1998
Released on J-STAGE: July 21, 2010
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3.Research on Radiation Damage to DNA Using Synchrotron Radiation
Kaoru TAKAKURA
1998 Volume 47 Issue 11 Pages
872-882
Published: November 15, 1998
Released on J-STAGE: July 21, 2010
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Makoto SAKATA
1998 Volume 47 Issue 11 Pages
883-888
Published: November 15, 1998
Released on J-STAGE: July 21, 2010
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[in Japanese], [in Japanese]
1998 Volume 47 Issue 11 Pages
889-890
Published: November 15, 1998
Released on J-STAGE: July 21, 2010
JOURNAL
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[in Japanese]
1998 Volume 47 Issue 11 Pages
891-892
Published: November 15, 1998
Released on J-STAGE: July 21, 2010
JOURNAL
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[in Japanese]
1998 Volume 47 Issue 11 Pages
893-895
Published: November 15, 1998
Released on J-STAGE: July 21, 2010
JOURNAL
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Subcommittee for Radioisotope in vitro Test
1998 Volume 47 Issue 11 Pages
i-Lxx
Published: November 15, 1998
Released on J-STAGE: July 21, 2010
JOURNAL
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