RADIOISOTOPES

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

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Volume 45, Issue 2

Displaying 1-17 of 17 articles from this issue

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Investigation on Shallow Groundwater in a Small Basin Using Natural Radioisotopes

Hiromasa HAMADA, Takami KOMAE

1996Volume 45Issue 2 Pages 71-81
Published: February 15, 1996
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.45.71

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The authors conducted an investigation on shallow groundwater using natural radioisotopes as indicators in the small basin of the Hinuma River, Kasama City, Ibaraki Prefecture, Japan.
³H concentrations in the groundwater showed that it originated from precipitation in the 1960's. Since ²²²Rn concentrations decreased as groundwater flowed downstream, they were influenced by infiltration of surface water. Especially, during the irrigation period, the decrease of ²²²Rn concentrations was remarkable in the lowland. From the distribution of ²²²Rn concentrations in surface water, the sections where groundwater seeped into a river were found, and a quantitative analysis of groundwater seepage in the two sections was conducted on the basis of ²²²Rn concentrations in groundwater and in surface water. The ratios of groundwater seepage to the flow at the upstream station for the two sections were about 5% and 10%, respectively. The water movement within the basin, i.e., the actual manner in which surface water infiltrated underground and groundwater seeped into a river, was clarified by analyzing the variations of natural radioisotope concentrations in water and the water balance of the basin.

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Radioecological Studies of ¹³⁷Cs in Limnological Ecosystems

—¹³⁷Cs Concentrations in Water, Sediment and Biota at the Lower Region of the Famous River in Saitama Prefecture—

Sadaaki MIYAKE, Misako MOTEGI, Takashi OOSAWA, Kiyoaki NAKAZAWA, Hirom ...

1996Volume 45Issue 2 Pages 82-86
Published: February 15, 1996
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.45.82

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The concentrations of ¹³⁷Cs in water, sediment and biota at the lower region of the famous river in Saitama prefecture were determined in order to elucidate the radioecology of ¹³⁷Cs in limnological ecosystems.
¹³⁷Cs concentration in water was 0.10 mBq/l.¹³⁷Cs concentrations in sediment, shellfish, Sinotaia quadratus historica (mean for 2 detectable samples), and fish, Carassius auratus cuvieri (mean for 2 detectable samples), were about 6200, 840 and 320 times higher than the concentration of the water, respectively. But ¹³⁷Cs radioactivity in the crustacea, Procambarus clarki, was significantly not detected.
So, ¹³⁷Cs transfer mechanism in the limnological ecosystems was indicated in part.

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Released Gaseous Tritium Activity from Tsuruga Power Station Unit No.2

Hisao FUNAMOTO, Masaharu YOSINARI, Masayuki FUKUDA, Hirohide ITOH, Tsu ...

1996Volume 45Issue 2 Pages 87-91
Published: February 15, 1996
Released on J-STAGE: September 07, 2010

DOIhttps://doi.org/10.3769/radioisotopes.45.87

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Released activity of gaseous tritium at Tsuruga Power Station Unit No. 2 (PWR 1160 Mwe) has been measured with a moisture condensation type monitoring equipment and found to be 2 TBq per year recently.
In power station, natural evaporation of spent fuel pool water has been recognized as the main source of released tritium. However, released activi-ty measured at stack has been about three times as much as estimated activity which is calculated based on concentration and evaporation volume of spent fuel pool water. This discrepancy could be explained by the presence of exchange of water between the pool and the atmosphere.

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A Proposal of Modifying the Quittner Method for Gamma-Ray Peak Area Determination

Kazuo TERANISHI, Kan-ichi FUJII, Hiroshi GOTOH

1996Volume 45Issue 2 Pages 92-94
Published: February 15, 1996
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.45.92

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Analysis of Active Conformation of Tumor Promoters

Yasuyuki ENDO

1996Volume 45Issue 2 Pages 95-104
Published: February 15, 1996
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.45.95

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Instruments for Radiation Measurements in Biosciences (2) . VII. Fourier Transform-Nuclear Magnetic Resonance Intrument

Kyoko ADACHI

1996Volume 45Issue 2 Pages 105-112
Published: February 15, 1996
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.45.105

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V. Biodosimetry with Electron Spin Resonance Equipment

Toshiyuki NAKAJIMA

1996Volume 45Issue 2 Pages 113-124
Published: February 15, 1996
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.45.113

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Measurements of Natural Radiation Exposure Rates on Train Lines in Tokai Area

Hideharu MATSUDA

1996Volume 45Issue 2 Pages 125-131
Published: February 15, 1996
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.45.125

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Equipments and Instruments for Use in Radiological Protection. XVII. Design of Radiation Facilities and Selection of Radiation Protection Instruments. 1. Design of Facilities for Unsealed Radiation Sources and Selection Guide of Radiation Protection Instruments

1.1 Research facility

Motomi KATADA

1996Volume 45Issue 2 Pages 132-137
Published: February 15, 1996
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.45.132

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1.2 Hospital facility

Keiji NAKAZAWA, Katsumi ISHII

1996Volume 45Issue 2 Pages 137-142
Published: February 15, 1996
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.45.137

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1.3 Instruments and radiation protection

Takehiko OTANI

1996Volume 45Issue 2 Pages 142-148
Published: February 15, 1996
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.45.142

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[title in Japanese]

[in Japanese], [in Japanese]

1996Volume 45Issue 2 Pages 149-150
Published: February 15, 1996
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.45.149

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[title in Japanese]

[in Japanese]

1996Volume 45Issue 2 Pages 151-152
Published: February 15, 1996
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.45.151

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[title in Japanese]

[in Japanese]

1996Volume 45Issue 2 Pages 153-154
Published: February 15, 1996
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.45.153

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[title in Japanese]

[in Japanese], [in Japanese]

1996Volume 45Issue 2 Pages 155-156
Published: February 15, 1996
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.45.155

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[title in Japanese]

[in Japanese]

1996Volume 45Issue 2 Pages 157-158
Published: February 15, 1996
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.45.157

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[title in Japanese]

[in Japanese]

1996Volume 45Issue 2 Pages 159-160
Published: February 15, 1996
Released on J-STAGE: July 21, 2010

DOIhttps://doi.org/10.3769/radioisotopes.45.159

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