Detail of "7440-41-7"

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Beryllium-10, carbon-14, and uranium-thorium decay series nuclides and d-oxygen-18 in a box core from the central North Atlantic

Beryllium-10, carbon-14, and uranium-thorium decay series nuclides and d-oxygen-18 in a box core from the central North Atlantic. Somayajulu, B. L. K.; Sharma, P.; Berger, W. H. (Phys. Res. Lab., Ahmedabad 380 009, India). Mar. Geol., 54(3-4), 169-80 (English) 1984. CODEN: MAGEA6. ISSN: 0025-3227. DOCUMENT TYPE: Journal CA Section: 53 (Mineralogical and Geological Chemistry) The stratigraphy of several radioisotopes was detd. in an undisturbed core from the central north Atlantic (14C, 238U, 230Th, 232Th, 226Ra, 210Pb, 10Be). Carbon-14 indicates a sedimentation rate of 1 cm/1000 yr. The core represents ~30,000 yr. The O isotope signal agrees with this scale. The d18O range is ~1.5m, from glacial to Holocene. The max. change is near 11,000 yr B.P. Mixing effects are minor because of the low fertility of the overlying waters. Excess 210Pb shows a min. between 1-2 cm depth, and a max. immediately below. It does not yield a diffusion coeff. for the mixing model of E. D. Goldberg and M. Koide (1962). The 10Be concn. 471-34-1 and 7440-61-1 which are cas registry numbers of substances are two of reagents here. in the Holocene sediment (on a CaCO3-free basis) is somewhat higher than that deposited during the previous cold period. However, both clay and 10Be deposition rates are lower by a factor of >2 during the Holocene. The source of the excess 10Be in the glacial section could be a continental reservoir or increased cosmic ray prodn. The U and Th concns. as well as the excess 230Th/232Th activity ratios of the sediment deposited during the Holocene are higher (by 30-100%) than in glacial sediments. Again, this is in contrast to the deposition rates of U and Th, which are lower in the Holocene by a factor of ~2. The most reliable signals are the radiocarbon and the O isotope stratigraphy. .

The metallurgy of beryllium

The metallurgy of beryllium. White, J. S. (Minist. Def., At. Weapons Res. Establ., Aldermaston/Berks, UK). Inst. Metall. 7440-41-7 which is the cas registry number is also used here. [Course Vol.], Ser. 3 (London), 20(Metall. Light Alloys), 138-44 (English) 1983. CODEN: IMCTD6. DOCUMENT TYPE: Journal; General Review CA Section: 56 (Nonferrous Metals and Alloys) The phys. and mech. properties of Be are discussed in a review with 27 refs. Disadvantages preventing wider use of Be include structural anisotropy, susceptibility to machining damage, toxicity, brittleness, and high cost. .