Isotopic abundance

Xem 1-5 trên 5 kết quả Isotopic abundance
  • In 1961 the NCRP issued NCRP Report No. 28, A Manual of Radioactivity Procedures, which was published as the National Bureau of Standards Handbook 80. The report came to be one of the definitive works in the area of radioactivity measurements. As the development of new techniques, procedures, and equipment made parts of the Report obsolescent, the NCRP recognized the need to update and extend the document.

    pdf609p camchuong_1 04-12-2012 20 4   Download

  • The cometabolism of citrate and glucose by growing Lactococcus lactisssp. lactis bv. diacetylactis was studied using a natural-abundance stable isotope technique. By a judicious choice of substrates differing slightly in their 13 C/ 12 C ratios, the simultaneous metabolism of citrate and glucose to a range of compounds was analysed. These end-products include lactate, acetate, formate, diacetyl and acetoin. All these products have pyruvate as a common intermediate.

    pdf9p awards 05-04-2013 24 2   Download

  • Introduction: It may seem something of a truism to describe an element as unique, but hydrogen is certainly one of the more unusual elements in the periodic table. It is the lightest element and consists of only a proton and an electron and is thus the only element not to contain a neutron in its main isotope (1H). In its stable molecular form (H2), it is also the least dense and the most abundant in the universe. Perhaps surprisingly, given that its low density results in gaseous hydrogen being almost nonexistent in the Earth’s lower atmosphere, it is also the...

    pdf8p congdat261 06-12-2010 81 6   Download

  • Cerium, an element in the lanthanide series, has a number of radioactive isotopes. Several of these are produced in abundance in nuclear fission reactions associated with nuclear industry operations or detonation of nuclear devices. This report summarizes our present knowledge of the relevant physical, chemical, and biological properties of radiocerium as a basis for establishing radiation protection guidelines.

    pdf119p camchuong_1 04-12-2012 22 6   Download

  • The abundance of the doubly substituted CO2 isotopologue, 13C18O16O, in CO2 produced by phosphoric acid digestion of synthetic, inorganic calcite and natural, biogenic aragonite is proportional to the concentration of 13C–18O bonds in reactant carbonate, and the concentration of these bonds is a function of the temperature of carbonate growth. This proportionality can be described between 1 and 50 C by the function: D47 = 0.0592 Æ 106 Æ T2  0.

    pdf18p taisaocothedung 12-01-2013 16 1   Download

CHỦ ĐỀ BẠN MUỐN TÌM

Đồng bộ tài khoản