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1

Stephen, Carpenter B., and United States. National Bureau of Standards., eds. Uranium-235 isotope abundance standard reference materials for gamma spectrometry measurements. U.S. Dept. of Commerce, National Bureau of Standards, 1986.

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2

Stephen, Carpenter B., and United States. National Bureau of Standards, eds. Uranium-235 isotope abundance standard reference materials for gamma spectrometry measurements. U.S. Dept. of Commerce, National Bureau of Standards, 1986.

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3

Stephen, Carpenter B., and United States. National Bureau of Standards., eds. Uranium-235 isotope abundance standard reference materials for gamma spectrometry measurements. U.S. Dept. of Commerce, National Bureau of Standards, 1986.

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4

Stephen, Carpenter B., and United States. National Bureau of Standards., eds. Uranium-235 isotope abundance standard reference materials for gamma spectrometry measurements. U.S. Dept. of Commerce, National Bureau of Standards, 1986.

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5

Stephen, Carpenter B., and United States. National Bureau of Standards, eds. Uranium-235 isotope abundance standard reference materials for gamma spectrometry measurements. U.S. Dept. of Commerce, National Bureau of Standards, 1986.

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6

Stephen, Carpenter B., and United States. National Bureau of Standards., eds. Uranium-235 isotope abundance standard reference materials for gamma spectrometry measurements. U.S. Dept. of Commerce, National Bureau of Standards, 1986.

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7

Puig, Alvaro. The geological and metallogenic significance of lead isotope abundance studies on galena occurrences in the Chilean Andes. Oxford Polytechnic, 1985.

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8

G, Walthall Frank, Philpotts John A, and Geological Survey (U.S.), eds. Abundances of Li, Rb, and Sr in W-2, BCR-1, and AC-E determined by isotope dilution mass spectroscopy. U.S. Dept. of the Interior, Geological Survey, 1993.

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9

R, Somma, and Geological Survey (U.S.), eds. Pb isotopes and toxic metal abundances in the floodplain and stream sediments from the Volturno River Basin (Campania, Italy): Natural and anthropogenic contributions. U.S. Dept. of the Interior, U.S. Geological Survey, 1999.

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10

Ellam, Rob. 4. Measuring isotopes. Oxford University Press, 2016. http://dx.doi.org/10.1093/actrade/9780198723622.003.0004.

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‘Measuring isotopes: counting the atoms’ explores how isotopes are measured. For stable isotopes, atoms of each isotope are counted using a mass spectrometer. This turns atoms into charged ions and separates them into the different isotopic species using a mass filter. Precise measurements of isotopic abundance can be achieved in a few minutes or hours. Mass spectrometry could be used for radioactive isotopes, but for short-lived isotopes, their low abundance often makes them difficult to detect. The alternative is to use nuclear spectroscopy or counting methods to detect the characteristic en
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11

Ellam, Rob. 6. Measuring isotopes. Oxford University Press, 2016. http://dx.doi.org/10.1093/actrade/9780198723622.003.0006.

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Mass spectrometers have become routine laboratory instruments in many disciplines. ‘Measuring isotopes: mass spectrometers’ concentrates on those used to quantify the abundance of different isotopes—gas source isotope ratio, thermal ionization, inductively coupled plasma, and secondary ion mass spectrometers. A mass spectrometer can be used to quantify the concentration of a particular element by monitoring an isotope of that element not overlapped by isotopes of other elements. All mass spectrometers have three essential components: an ion source, a mass filter, and a detector. There are two
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12

Jr, E. C. Alexander. Terrestrial Rare Gases: Proceedings of the U.S.-Japan Seminar on Rare Gas Abundance and Isotopic Constraints on the Origin and Evolution of the ... Ingramcontent, 2012.

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13

Leske, Richard A. The elemental and isotopic composition of galactic cosmic-ray nuclei from scandium through nickel. 1992.

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14

Eierman, Robert J. Nitrogen isotope abundance ratio determination using molecular emission spectrometry. 1985.

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15

Uranium-235 isotope abundance standard reference materials for gamma spectrometry measurements. U.S. Dept. of Commerce, National Bureau of Standards, 1986.

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16

Close, Frank. 4. Odds, evens, and shells. Oxford University Press, 2015. http://dx.doi.org/10.1093/actrade/9780198718635.003.0004.

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‘Odds, evens, and shells’ considers the fundamental property laws governing nuclear structure. It explains element stability and abundance, as well as the quantum rules, magic numbers, shells, and binding energy that explain atomic and element structure. An effective guide to stability, and the pattern of radioactive decays, is given by the semi-empirical mass formula. As nature seeks stability by minimising energy, a nucleus seeks to lower the total mass or increase the binding energy by emitting an alpha particle cluster, by beta decay, or by splitting in two, as in uranium fission. Alpha de
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17

Meyer, H., P. De Bievre, H. L. Eschbach, and R. Lesser. 235 Uranium Isotope Abundance Certified Reference Material for Gamma Spectrometry: Ec Nuclear Reference Material 171 Certification Report (Bcr Infor). European Communities, 1986.

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18

Rez, Peter. Materials That Come from the Earth. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198802297.003.0013.

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Many of the materials used are ultimately derived from things extracted from the earth. There is always an energy-intensive step of converting the oxide as found in the earth’s crust to the element or metal. Since carbon in the form of coke is frequently used in this process, it is inevitable that CO2 is emitted. Another thing to consider is the scarcity of the compound from which the element will be derived—that is, the grade of the ore. A low grade of ore, with little of the element of interest, will mean more energy will need to be used to dig up a greater quantity of material. Practically
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19

Variation of natural abundance nitrogen and carbon stable isotopes in vegetation and soil as a function of historical land-use: Documenting environmental change and ecological adaptation. 2006.

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