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Satoyasu Iimori (19 October 1885 – 13 October 1982) was a Japanese analytical chemist, and the pioneer of radiochemistry. He was the honorary research member of the Institute of Physical and Chemical Research (RIKEN) and also the honorary member of the Chemical Society of Japan as well as the Society of the Analytical Chemistry of Japan. He is so called “the father of radiochemistry in Japan”, as his establishment in the study of radiochemistry which was not developed at that time in Japan and his contribution for the study. After his retirement as the researcher he was interested in creation of artificial gemstones.

=Biography= He was born in Kanazawa City, Ishikawa Pref. in 1885. In 1906 he entered the Department of Chemistry of Tokyo Imperial University, where studied under Tamemasa Haga and Kikunae Ikeda. Continuing his study in the graduate college of the university, he was conferred the Degree of Doctorate of Science for his research relation to cyano-complex compounds of iron.

In 1917 he entered the Institute of Physical and Chemical Research (RIKEN), where he started to work in the research of analysis of various minerals. As he appointed to study radiochemistry, he went to U.K. in 1919. At first his research was with Charles Heycock who was the chemist in the laboratory of in Cambridge University due to the circumstance of Soddy. He started to work with Frederick Soddy in October 1920 and completed the research in June 1921, where his study was focused on the radiochemistry.

After returning to Japan, he led his own laboratory as the chief researcher of RIKEN. Along with working for the research of radiochemistry, the laboratory conducted the research of analytical chemistry, mineralogical chemistry, photochemistry, geochemistry especially of rare elements, luminescence of minerals and ceramics as well.

During the World War II because of his major research was focused on radiochemical minerals, he worked for the search of uranium containing ore in the project “Ni-Go Kenkyu(Project NIGO)”. After the war his major research of radiochemistry was prohibited by US authority he did not have particular project, however he started to develop in the field of ceramic materials and retired from RIKEN in 1952.

While he had his specific interest in the “actinolite” he started the creation of artificial gemstones which are based on his own idea as a mineralogist. They were called “IL Stone”, which had patented in 1955. He established “Iimori Laboratory,Ltd.” to run the business for the creation and trading them. Some of those gemstones were mostly exported to the U.S. in 70’s as well as traded in Japan.

Papers in English and German
Sc.P.I.P.C.R. is Scientific Papers of the Institute of Physical and Chemical Research Bull. Chem. Soc. Japan is Bulletin of the Chemical Society of Japan
 * "Maβanalytische Bestimmung des Schwefelwasserstoffes in alkalischer Losung mit Ferricyankalium", Japanese J. Chem., 1, 43-54 (1922)
 * "Radioactive Manganiferous Nodules from Tanokami Oomi Province", Sc.Pap.I.P.C.R., 4, 79-83(1926)、Bull. Chem. Soc. Japan, 1, 43-47(1926)
 * coauthor J. Yoshimura, "The Radioactivity of the Rubidium extracted from the Lepidolite and Zinnwaldite of Japan", Bull. Chem. Soc. Japan, 1, 215-219(1926), Sc.Pap.I.P.C.R., 5, 249-253(1927)
 * coauthor J. Yoshimura, "Lepidolite from Nagatori, Chikuzen, Province and the Lithium Content of Japanese Mica", Bull. Chem. Soc. Japan, 1, 237-239(1926), Sc.Pap.I.P.C.R., 5, 254-256(1927)
 * coauthor J. Yoshimura "Pleochroic Haloes in Biotite. Probable Existence of the Independent Origin of the Actinium Series", Sc.Pap.I.P.C.R.[1], 5, 11-24(1927)((1926))
 * "Formation of the Radioactive Manganiferous Deposits from Tanokami, and the Source of Manganese in the Deep-sea Manganese Nodules", Bull. Chem. Soc. Japan, 2, 270-273 (1927), Sc.Pap.I.P.C.R., 7, 249-252（1927)
 * "The Green Kaolin from Tanokami, Identity of the Universal Minor Constituents of the Igneous Rock with the Chromospheric Elements of the Sun", Bull. Chem. Soc. Japan, 2', 274-278(1927), Sc.Pap.I.P.C.R., 7, 253-257 (1927)
 * "A Photochemical Cell Containing a Solution of Potassium Ferrocyanide", Sc.Pap.I.P.C.R., 8 (Supplement), 11-13（1928)
 * "Photochemical Cell with Complex Cyanides of Nickel or Platinum", Sc.Pap.I.P.C.R., 8, 14-15（1928)
 * coauthor T. Takebe, "The Photogalvanic Cell Furnished with Silver Iodide Electrodes and Its Application to Photometry and Luminometry", Sc.Pap.I.P.C.R., 8, 131-160 (1928)
 * "The Approximate Content of Gallium in the Green Kaolin from Tanokami. On the Existence of Gallium in the Solar Chromosphere",Sc.Pap.I.P.C.R., 10(Supplement), 1-4(1929)
 * "The Uranium-Thorium Ratio in Monazite"," Sc. Pap. I.P.C.R.", 10, 229-236(1929)
 * coauthor T. Yoshimura, "Geographical Distribution of Certain Minerals in Japan", Sc.Pap.I.P.C.R., 10 (Supplement), 5-46 (1929)
 * coauthor J. Yoshimura "A Rosy Muscovite from Suizawa and a Dark-grey Muscovite from Doi",Sc.Pap.I.P.C.R., 10, 221-223(1929)
 * "A Pink Kaolin, and Ruthenium as a Minor Constituent of the Tanokami Kaolin", Sc.Pap.I.P.C.R., 10, 224-228(1929)、Bull. Chem. Soc. Japan, 4, 1-5 (1929)
 * coauthor J. Yoshimura, S. Hata,"A New Radioactive Mineral found in Japan",Sc.Pap.I.P.C.R., 15, 83-88 (1931)
 * coauthor E. Iwase, "The Solarization of Fluorite and the Law of Lumino-transformation", Sc.Pap.I.P.C.R., 16, 41-67(1931)
 * "On the Constitution of Phosphorescence Centers in Fluorite",Sc.Pap.I.P.C.R., 20, 189-200 (1933)
 * "Periodicity in the Solarization of Calcite", Nature, 131, 619 (1933)
 * "The Thermo-luminescence Spectrum of Calcite", Sc.Pap.I.P.C.R., 20, 274-284(1933)
 * "The Solarization of Luminiferous Calcite", Sc.Pap.I.P.C.R., 21, 220-231(1933)
 * coauthor E. Iwase, "Spektrographische Untersuchung uber die Thermo-lumineszenz des Feldspates", Sc.Pap.I.P.C.R., 28, 147-151(1935)
 * "The Photoluminescence of Feldspar", Sc.Pap.I.P.C.R., 29, 79-110(1936)
 * coauthor J. Yoshimura,"The Cathodo-Luminescence Spectrum of Danburite",Sc. Pap. I.P.C.R., 31, 225-228 (1937)
 * coauther J. Yoshimura, "The Cathodo-Luminescence Spectra of Feldspars and Other Alkali Alumino-silicate Minerals", Sc.Pap.I.P.C.R., 31, 281-295(1937)
 * coauthor E. Iwase, "The Cathodo-luminescence of Luminescent Calcium Silicate", Sc.Pap.I.P.C.R., 34, 173-181(1938)
 * coauthor E. Iwase, "The Fluorescence Spectrum of Autunite",Sc.Pap.I.P.C.R., 34, 372-376(1938)
 * coauthor S. Hata, "Japanese Thorogummite and Its ParentMineral", Sc.Pap.I.P.C.R., 34, 447-454(1938)
 * coauthor S. Hata, "Fergusonite from a New Locality", Sc.Pap.I.P.C.R., 34, 504-507(1938)
 * coauthor S. Hata, "Samarskite found in the Placer of Ryujomen, Korea", Sc.Pap.I.P.C.R., 34, 922-930(1938)
 * coauthor S. Hata, "Tantalite occurring in a Korea Gold Placer", Sc.Pap.I.P.C.R., 34, 1010-1013(1938)