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Volume 9 (1974)
- Issue 4 Pages 205-
- Issue 3 Pages 143-
- Issue 2 Pages 65-
- Issue 1 Pages 3-
Volume 9, Issue 4
Displaying 1-8 of 8 articles from this issue
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Takashi HAYASHI1974 Volume 9 Issue 4 Pages 205-209
Published: 1974
Released on J-STAGE: February 25, 2010
JOURNAL FREE ACCESSAnnual γ-exposure around a nuclear site has been evaluated from short term plume-exposures with annual statistics of meteorological condition in which wind directions counted in a sector of 16 compass points are considered to be on the center of the sector. In this report, effects of wind direction frequency distribution in a sector itself on the γ-exposure are described. Correction coefficients to be applied to conventional calculation are obtained. Methods of calculation of plume-exposure and formula of frequency distribution in a sector are discussed.View full abstractDownload PDF (639K) -
Kanji TAKAHASHI, Tsutomu NANJYO, Toshio TAMACHI, Ryoseki TANAKA1974 Volume 9 Issue 4 Pages 211-217
Published: 1974
Released on J-STAGE: February 25, 2010
JOURNAL FREE ACCESSSome characteristics of I2-gas relevant to its transportation in earths were investigated.
The sorption was studied by passing 131I loaded I2-gas through thin beds of earth samples under various conditions of the temperature and relative humidity. Desorption was examined by sweeping these beds with dry air and by leaching with water. Some of the results are (1) sorption is large for dry earths, while it becomes much smaller with increase of moisture, (2) a variety of desorptivity was observed, still the remaining quantity at the end of water leaching was nearly independent of the kind of samples and of experimental conditions, and (3) sorption increases linearly at first and tends to saturation, where the limit of linearity will correspond to the adsorption with monomolecular layer.
The transportation behavior was studied by passing I2-gas through a 35cm tube filled with the earth sample. The time-dependent distribution of iodine was obtained radiologically. The result is approximately expressed by a transport equation taking the Henry type adsorption and the chemisorption into account.View full abstractDownload PDF (760K) -
Toshiyuki NAKAJIMA, Hironobu WATANABE, Kenzou FUJIMOTO1974 Volume 9 Issue 4 Pages 219-222
Published: 1974
Released on J-STAGE: February 25, 2010
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Susumu KITANI, Yoshio IKEZAWA1974 Volume 9 Issue 4 Pages 223-231
Published: 1974
Released on J-STAGE: February 25, 2010
JOURNAL FREE ACCESSThis review describes the chemical form and removal of airborne radioiodine released in a loss-of-coolant accident of light water reactor. The chemical form of the iodine is considered to be elemental and partially organic as methyl iodide.
The airborne iodine is removed in the reactor containment by spray and air-filter systems, and the iodine leaked from the containment by another air-filter system. Those air-filter systems consist of impregnated chacoal, HEPA filter and additional installations. The materials impregnated on charcoal for removal of methyl iodide are triethylenediamine, KI and SnI2. Those charcoals, however, should be operated under the condition of relative humidity less than 97%. In order to use the charcoals with good performance, it is necessary to have information on the deterioration due to adsorption of impurities in the enviromental atmosphere.View full abstractDownload PDF (1133K) -
Yoshikazu YOSHIDA, Mitsuo NARITOMI1974 Volume 9 Issue 4 Pages 233-241
Published: 1974
Released on J-STAGE: February 25, 2010
JOURNAL FREE ACCESSThe monitoring techniques for airborne radioiodine, based on the findings at JAERI and the works elsewhere are described:
1) Properties of the airborne radioiodine encountered in radiation work.
2) Performance of the iodine sampler consisting of a cellulose asbestos filter paper and a charcoal-loaded filter paper or charcoal cartridges, or the three.
3) Improvement of the sampler by use of charcoal impregnated with chemicals such as triethylenediamine (TEDA) or by dehumidification through heating the sampling air.
4) Practices of the monitoring in radiation protection.
Problems in environmental monitoring of the airborne radioiodine from a light water power reactors and fuel reprocessing plants are also presented.View full abstractDownload PDF (1177K) -
Toyohide ISHIHARA1974 Volume 9 Issue 4 Pages 243-249
Published: 1974
Released on J-STAGE: February 25, 2010
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Hiroyoshi IIDA1974 Volume 9 Issue 4 Pages 251-253
Published: 1974
Released on J-STAGE: February 25, 2010
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Masayuki HOSHINO1974 Volume 9 Issue 4 Pages 279-280
Published: 1974
Released on J-STAGE: February 25, 2010
JOURNAL FREE ACCESSDownload PDF (247K)
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