Contents of Strontium-90 and Ruthenium-106 in Beach and Shallow Water Deposits of Noto Peninsula
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<SUP>90</SUP>Sr, <SUP>106</SUP>Ru, natural strontium and major elements were studied in 12 samples of beach deposits from Togi, Fukuura and Shiga, and in 26 samples of shallow water sediments from sea off Fukuura, Noto Peninsula, Ishikawa Pref., Japan.<BR>The average contents of natural strontium and <SUP>90</SUP>Sr in the beach deposits were 488 ppm ranging from 247 to 1, 550 ppm and 45 ± 9 pCi kg<SUP>-1</SUP>-dry mud ranging from 18 to 72 pCi kg<SUP>-1</SUP>-dry mud, respectively. While the average contents of natural strontium, 90Sr and 106Ru in the sediments were 234 ppm ranging from 136 to 415 ppm, 22 ± 6 pCi kg<SUP>-1</SUP>-dry sand ranging from 7 to 48 pCi kg<SUP>-1</SUP>-dry sand and 0.6 ± 0.2 nCi kg<SUP>-1</SUP>-dry ranging from 0.3 to 1.2 nCi kg<SUP>-1</SUP>-dry, respectively.<BR>The average contents of each natural strontium and 90Sr in the beach deposits were about two times higher than those in the shallow water sediments. But no obvious relation of natural strontium to 90Sr was found in all the samples. The enrichment of <SUP>90</SUP>Sr and <SUP>106</SUP>Ru in the beach deposits or tthe sediments were as high as 150±320 and of 2, 000-3, 000 compared with average contents of <SUP>90</SUP>Sr and <SUP>106</SUP>Ru in a liter of surface water from the Japan Sea. It is to be noticed that the average 106Ru to 90Sr ratio of 27 for the shallow water sediments is much higher than the average of 1.0 for surface sea water of the Japan Sea.<BR>As to major elements of the samples, the beach deposits are rich in silicon (Av. 70.89 ± 0.92 % SiO<SUB>2</SUB>), but poor in iron (Av. 2.99 ± 0.32 % Fe<SUB>2</SUB>0<SUB>3</SUB>). Whereas the shallow water sediments are poor in silicon (Av. 52.96 ± 10.33 % SiO<SUB>2</SUB>) and rich in iron (Av. 5.50 ± 1.90 % Fe<SUB>2</SUB>O<SUB>3</SUB>), calcium (Av. 9.64±9.22 % CaO) and magnesium (Av. 2.83 ± 1.58 % MgO).
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