Journal of Radiation Research
Online ISSN : 1349-9157
Print ISSN : 0449-3060
Volume 10, Issue 2
Displaying 1-8 of 8 articles from this issue
  • Fumio KAWAMURA, Kazuo OKAMOTO, Jindo KOBAYASHI, Satiko KAWANO
    1969 Volume 10 Issue 2 Pages 45-51
    Published: June 01, 1969
    Released on J-STAGE: August 29, 2006
    JOURNAL FREE ACCESS
    The effects of X-ray irradiation on the bound water of living tissues, such as rat muscle, liver tissue, red cells and mouse thymus tissue were studied by the vapor pressure method.
    The amount of bound water in various living tissues after irradiation changed appreciably from that in normal tissues.
    The experimental data were analyzed on the basis of the BET theory. The alteration in bound water on exposure might be related to change in the number of free polar groups capable of forming hydrogen bonds.
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  • Toshio SEKIKAWA, Sadamu MOCHIZUKI
    1969 Volume 10 Issue 2 Pages 52-61
    Published: June 01, 1969
    Released on J-STAGE: August 29, 2006
    JOURNAL FREE ACCESS
    A parallel plate type of mobility spectrometer provided with nuclear plates which are placed in a row in the middle area of collecting plates prior to sampling is examined for measuring the mobility spectra of radioactive charged aerosols.
    By this technique, it is able to record α ray tracks of radioactive substances collected on the surface of nuclear plates during and after sampling.
    In stored radioactive aerosols in a vessel carrying Rn decay products, RaA was often found clearly on the developed nuclear plate its star type α tracks with the mobility ranging from 3 cm2/v ⋅sec to 0.3 cm2/v ⋅sec.
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  • Noboru YAMAGATA, Morito CHIBA, Hironobu KOBAYASHI
    1969 Volume 10 Issue 2 Pages 62-72
    Published: June 01, 1969
    Released on J-STAGE: August 29, 2006
    JOURNAL FREE ACCESS
    In view of the discrepancies between some data of the soil analysis, and the accumulated deposition of 90Sr (1) technical errors in the analysis and (2) sampling errors due to the horizontal surface distribution were examined. The NaOH-HCl leach method was found the best among the conventional substitutes for the standard fusion method and an interlaboratory comparison also probed the applicability of this method as a standard. A study was made how to obtain a representative sample from an area of 1000 m2 of particular location. Statistical analysis of data obtained from undisturbed, rice and wheat-field suggested that to get a confidential limit of 10% at least 10, 4 and 8 cores, respectively, should be taken for making a composite sample. A preliminary study on the vertical distribution was also made in undisturbed soils. The amount in the upper 10 cm layer was 81.3% on the average of the total to the depth of 30-50 cm in different soil profiles.
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  • Kouichi ASAMI, Takeshi YAMADA
    1969 Volume 10 Issue 2 Pages 73-77
    Published: June 01, 1969
    Released on J-STAGE: August 29, 2006
    JOURNAL FREE ACCESS
    The Crabtree effect, glucose-induced respiratory inhibition in Ehrlich ascites tumor cells, was abolished by γ-irradiation. Decline of ATP level and simultaneous increase of ADP were observed after the irradiation of the cells. The possibility that abolition of the Crabtree effect may be due to the increase in ADP content is discussed.
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  • Iwashiro OKI, Sachiko TAMURA-YOSHIDA
    1969 Volume 10 Issue 2 Pages 78-82
    Published: June 01, 1969
    Released on J-STAGE: August 29, 2006
    JOURNAL FREE ACCESS
    By means of γ ray spectrometry, a qualitative variation in the diurnal variation of the natural radioactivity in the airborne dust was observed. The radioactive decay rate of the total natural radioactivity in the airborne dust collected during the day was higher than that collected during the night. It was found that the ratio of 212Pb (Th B) γ activity to the total γ activity was higher in the night and lower in the day, on the other hand, the ratios of 214Pb (Ra B) and 214Bi (Ra C) were a little higher in the day than in the night. From the observations, it was concluded that the quantitative diurnal variation of the natural radioactivity in the airborne dust was associated also with the qualitative variation derived from the variation in the abundance ratio of nuclide.
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  • Kenichi KAWAI, Asako WAKI, Mitsuhiko AKABOSHI, Shiro IWATA
    1969 Volume 10 Issue 2 Pages 83-87
    Published: June 01, 1969
    Released on J-STAGE: August 29, 2006
    JOURNAL FREE ACCESS
    32P-retention in the DNA irradiated under the various conditions was examined. The retention was enhanced with increasing irradiation time when DNA containing appropriate amount of H2O was irradiated at -78°C. The enhancement was based on the reactor irradiation, that is, some kind of radiations (γ-rays, fast neutrons etc.) seem to concern to this enhancement. The second irradiation immediately after the first irradiation had an effect to increase 32P-retention, but after prolonged interval, it failed to increase the retention. From these results, possible mechanisms of the phenomenon were discussed.
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  • Ryushi ICHIKAWA, Jiro INABA, Naonori MATSUSAKA
    1969 Volume 10 Issue 2 Pages 88-93
    Published: June 01, 1969
    Released on J-STAGE: August 29, 2006
    JOURNAL FREE ACCESS
    Reason for the higher retention of 137Cs in the suckling than in the weanling rat was investigated. Rat pups, which were given 137Cs previously, were divided into two groups at 21 days of age, i.e., at the normal weaning age. One group weaned to the usual solid diet at this age, whereas the other group was kept under breast-feeding for one to two weeks longer beyond this normal weaning time. The latter group showed higher retention of 137Cs than the former. The dietary difference should be at least one of the most important factors associated with the long biological half-life of this nuclide in the suckling rats. However, the elevated body retention in the rats of prolonged breast-feeding was still less than that in the suckling rats of early days after birth. Therefore, the high retention of 137Cs in the normal suckling rats may not be fully explained by the breast-feeding alone.
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  • Jiro INABA, Naonori MATSUSAKA, Ryushi ICHIKAWA
    1969 Volume 10 Issue 2 Pages 94-100
    Published: June 01, 1969
    Released on J-STAGE: August 29, 2006
    JOURNAL FREE ACCESS
    Some factors affecting on 137Cs retention in young rats were investigated to study the characteristic features in the metabolism of the nuclide in the rats of early stage of growth. Supplement of potassium accerelated 137Cs removal from sucklings but slightly from weanlings. Weanling rat fed on lactose-supplemented diet showed somewhat higher retention of the nuclide than that in the control rats. Daily administration of thyroxine to suckling rats increased removal of body 137Cs. However, this effect began to appear about ten to twelve days after the beginning of the administration of thyroxine in the case of 7-day-old sucklings (age at the beginning of experiment), whereas it appeared within a few days in the case of 17-day-old ones.
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