Japanese Journal of Health Physics

Radiation Management Column (Vol. 38, No. 2)

Internal Dose Calculation Code “IMBA.”

Osamu KURIHARA, Koji TAKASAKI, Takumaro MOMOSE

2003 Volume 38 Issue 2 Pages 109-112
Published: 2003
Released on J-STAGE: August 05, 2010

DOIhttps://doi.org/10.5453/jhps.38.109

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Preparatory Activities for Reducing Exposure Dosage during Fugen Decommissioning Project

Yukihiro IGUCHI, Yoshiaki YAMATO, Yoshiki KANEHIRA, Yoshitake SHIRATOR ...

2003 Volume 38 Issue 2 Pages 116-127
Published: 2003
Released on J-STAGE: August 05, 2010

DOIhttps://doi.org/10.5453/jhps.38.116

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Operation of the Fugen nuclear power station ended in March 2003, and the preparations for decommissioning have started. Fugen has been preparing for the project, and various evaluations and studies are underway, including evaluation of radioactive waste inventory, improvement of decontamination for decommissioning, development of a tritium decontamination and decommissioning engineering support system, etc. Activities to reduce the occupational radioactivity dosage during the decommissioning process are also discussed.

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Long-term Trends of ¹³⁷Cs Concentrations in Marine Biota, Sediments and Seawater in the Coastal Seas in the Vicinity of Nuclear Power Plants in Japan

Kazuo TAKADA, Yuzuru SUZUKI

2003 Volume 38 Issue 2 Pages 128-139
Published: 2003
Released on J-STAGE: August 05, 2010

DOIhttps://doi.org/10.5453/jhps.38.128

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The results of the long-term trend analyses of the ¹³⁷Cs data obtained during the marine environmental radioactivity monitoring program sponsored by the Ministry of Education, Culture, Sports, Science and Technology and carried out from 1983 to 2000 by the Marine Ecology Research Institute are presented. In 86.8% of the marine biota, 75.6% of the sediments, 100% of the surface seawater and 91.1% of the bottom seawater, a statistically significant decrease of ¹³⁷Cs concentrations was observed. The ¹³⁷Cs concentrations in the bottom seawater and sediments below the depth of 200m decreased more slowly than those above the 200m depth. The ¹³⁷Cs concentrations in the marine biota, surface seawater, and bottom Seawater and sediments above 200m decreased by similar annual rates of 0.039, 0.041, 0.045 and 0.041 year^-1, respectively. Those of the bottom seawater and sediments below the 200m depth (200-500m) decreased by the rates of 0.025 and 0.026 year^-1, respectively. These results suggest that an equilibrium in¹³⁷Cs concentrations in the seawater and sediments, including the marine biota above the 200m depth, is attained both above and below the depth of 200m.

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A Study of the Decontamination Effect of Commercial Detergents on the Skin

Koji TAKASAKI, Kenjiro MIYABE, Yuichi IZUMI, Hideo YASUNAKA

2003 Volume 38 Issue 2 Pages 140-147
Published: 2003
Released on J-STAGE: August 05, 2010

DOIhttps://doi.org/10.5453/jhps.38.140

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Titanium dioxide paste is generally used as the radiological skin decontaminant in the radiation control area at JNC Tokai works. It is a typical and proven skin decontaminant in the nuclear industry, but there is a disadvantage in that it has a short shelf life. Recently, many detergents applicable as skin decontaminants have become available in non-nuclear industries such as cosmetics and sanitation. They are easily acquired and have an advantage in that stimulus to the skin is mild, because these products have been developed for the human body. In this study, the decontamination factor of the commercial detergents for each nuclide was examined using imitation skin. Sheets of raw pig skins were contaminated with a nitric-acid solution containing ¹⁴⁴Ce, ¹³⁷Cs ¹⁰⁶Ru or ⁶⁰Co, and then washed with various detergents such as a neutral detergent, cleansing cream and orange oil. The nuclide removal rates of some of the commercial detergents examined were nearly equal to that of titanium dioxide, thus proving that they show satisfactory decontamination performance as a skin decontaminant.

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The Transition and Distribution of ⁹⁰Sr and ¹³⁷Cs Concentrations in Fukuoka Prefecture (1989-2000)

Yukinori NARAZAKI, Shiro TAGAMI

2003 Volume 38 Issue 2 Pages 148-153
Published: 2003
Released on J-STAGE: August 05, 2010

DOIhttps://doi.org/10.5453/jhps.38.148

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This paper summarizes the distribution and concentration of ⁹⁰Sr and ¹³⁷Cs fallout in the natural environment (deposition, soil, total diet, service water, seawater and sea sediment) of Fukuoka Prefecture, and related transition during the period from 1989 to 2000. The ⁹⁰Sr and ¹³⁷Cs concentrations respectively showed a gradual decrease over the timeframe; especially, ⁹⁰Sr deposition has not been detected since 1997, while ¹³⁷Cs has been detected rarely. Both radionuclides had accumulated in the soil at comparatively high concentrations for a long period of time; the average concentrations of ⁹⁰Sr and ¹³⁷Cs in the upper 5-cm soil layer were 5.3Bq/kg dry and 6.0Bq/kg dry, respectively. Their concentrations in the total diet were significantly different between the urban districts and fishing villages, mainly depending on the contents of the meals. No significant difference was observed in ⁹⁰Sr concentration when comparing fresh water and seawater. ¹³⁷Cs was detected in seawater, but not in fresh water. On the other hand, ¹³⁷Cs was detected in sea sediment, but ⁹⁰Sr was not. These observations suggest that there is a remarkable difference in the behavior of each nuclide in the environment.

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Safe Management of Spent Radiation Source

(1) Scheme for Spent Radiation Source Management

Toshiso KOSAKO

2003 Volume 38 Issue 2 Pages 154-156
Published: 2003
Released on J-STAGE: August 05, 2010

DOIhttps://doi.org/10.5453/jhps.38.154

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Safe Management of Spent Radiation Source

(2) Current IAEA Activities Related to Safety of Radiation Sources

Nobuyuki SUGIURA

2003 Volume 38 Issue 2 Pages 157-160
Published: 2003
Released on J-STAGE: August 05, 2010

DOIhttps://doi.org/10.5453/jhps.38.157

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Safe Management of Spent Radiation Source

(3) Current Status of Spent Radiation Source Management in Japan

Hidenori YONEHARA

2003 Volume 38 Issue 2 Pages 161-163
Published: 2003
Released on J-STAGE: August 05, 2010

DOIhttps://doi.org/10.5453/jhps.38.161

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Safe Management of Spent Radiation Source

(4) Spent Radiation Source Management System in Japan

Tetsuo KITADA

2003 Volume 38 Issue 2 Pages 164-167
Published: 2003
Released on J-STAGE: August 05, 2010

DOIhttps://doi.org/10.5453/jhps.38.164

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Safe Management of Spent Radiation Source

(5) Current Status of Spent Radiation Source Management in the Philippines

E. M. VALDEZCO, E. A. MARCELO, E. S. CASERIA, D. S. SALOM

2003 Volume 38 Issue 2 Pages 168-174
Published: 2003
Released on J-STAGE: August 05, 2010

DOIhttps://doi.org/10.5453/jhps.38.168

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Safe Management of Spent Radiation Source

(6) Current Status of Spent Radiation Source Management in Thailand

Nanthavan CHANTARAPRACHOOM

2003 Volume 38 Issue 2 Pages 175-180
Published: 2003
Released on J-STAGE: August 05, 2010

DOIhttps://doi.org/10.5453/jhps.38.175

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Safe Management of Spent Radiation Source

(7) Current Status of Spent Radiation Source Management in Indonesia

Asmedi SURIPTO, Djarot Sulistio WISNUBROTO

2003 Volume 38 Issue 2 Pages 181-187
Published: 2003
Released on J-STAGE: August 05, 2010

DOIhttps://doi.org/10.5453/jhps.38.181

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Safe Management of Spent Radiation Source

(8) Current Status of Spent Radiation Source Management in Korea

Kwang-Sub CHOI, Sang-woon SHIN, Myung-Jae SONG

2003 Volume 38 Issue 2 Pages 188-193
Published: 2003
Released on J-STAGE: August 05, 2010

DOIhttps://doi.org/10.5453/jhps.38.188

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