PubMed · 4963284
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S Sunahara. 1967. [Present and future problems in tuberculosis].. https://pubmed.ncbi.nlm.nih.gov/4963284/
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The pioneers of neurology in Japan were professors Hiroshi Kawahara and Kinnosuke Miura. Kawahara published the first description of progressive bulbar palsy and wrote the first neurology textbook in Japan. Miura, on the other hand, published studies about amyotrophic lateral sclerosis, in addition to participating in the founding of the Japanese Society of Neurology. The influence of European neurology, particularly French and German, in the figures of Professor Jean-Martin Charcot and Professor Erwin Bälz, was fundamental in the consolidation of neurology in Japan.
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To evaluate the impact of the 1999 criticality accident in Tokai-mura on the U isotope composition in soils, U isotopes (235U and 238U) were determined with inductively coupled plasma-mass spectrometry (ICP-MS) for soil core samples collected on the JCO grounds after the accident. The 235U/238U ratios were higher than the natural ratio in most samples. The highest ratio observed was 0.0262. Although vertical profiles of the 235U/238U ratio differed among the soil cores, the ratios tended to be high at the surface and decreased with depth. The U concentration also changed with depth. The percentages of 235U in the excess U, estimated from the positive correlation between U concentration and the 235U/238U ratio in soil samples, were less than 4% by mass (mostly 1-3%) and were much lower than the enrichment of the U used in the uranium conversion building at the time of the criticality accident (18.8%). These findings indicate that enriched U had been released before the criticality accident during the U processing at JCO in connection with the reconversion of light water reactor fuel. Since the range of the U concentrations found was comparable to the range of uncontaminated Japanese surface soils, the amount of U added to the soil was judged negligible from a radiation protection viewpoint.