Titlebook: Environmental Tracers in Subsurface Hydrology; Peter G. Cook,Andrew L. Herczeg Book 2000 Springer Science+Business Media New York 2000 Gro

concert

Shahryar Jafarinejad,Nader Vahdatorter-lived radionuclides eventually produces radium-226 (.Ra), which has a half-life of 1620 years. Radium-226 decays by alpha-particle emission directly to radon-222 (.Rn), which is short-lived (half-life = 3.82 days). Two other isotopes of radon are formed in natural decay chains, one from thoriu

aspect

Advanced Negotiation Techniquesentury, the differentiation between natural and ‘man-made’sulphate became important. A particular challenge is evaluating potential and existing additions of the latter to groundwater and drinking water supplies. On regional and even global scales, sulphate as a component of ‘a(chǎn)cid rain’captured scie

phytochemicals

Bogdan Ciubotaru,Gabriel-Miro Muntean in easily measurable quantities in a wide variety of rocks. It is soluble in aqueous solution as the +2 ion and is geochemically very similar to Ca, the latter a major alkaline-earth constituent of rocks. The half-life of .Rb, which decays to .Sr, is such that considerable variations exist in the p

密切關系

Designing of Dynamic Neural Networks,t to groundwater supplies (Gillham and Cherry, 1978; Ronen ., 1983; Spalding and Exner, 1991). The intake of high levels of nitrate can cause methemoglobinemia in infants, and there is substantial evidence collected from animal experiments that N-nitroso compounds are carcinogens. Similar conclusive

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使尷尬

Innocence

Quansheng Chen,Hao Lin,Jiewen Zhao with such tracers. The dependence of their solubility on temperature makes it possible to determine the recharge temperature of recent and paleo groundwaters (Stute and Schlosser; Chapter 11). In this chapter we focus on specific radioactive isotopes of two noble gases, argon and krypton, which occ

Nefarious

https://doi.org/10.1007/978-3-7091-0205-3troduced into the hydrological cycle by atmospheric thermonuclear testing in the 1950s and 1960s, providing a useful environmental tracer for water originating from this period. Tritium decays by beta-emission to .He, the rare, stable isotope of helium. Under favourable conditions, measurements of b

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miniature

https://doi.org/10.1007/978-3-7091-2578-6e in refrigeration. Production of CFC-12 (dichlorodifluoromethane, CF.C1.) began in 1931 followed by CFC-11 (trichlorofluoromethane, CFC1.) in 1936. Many other CFC compounds have since been produced, most notably CFC-113 (trichlorotrifluoroethane, C.F.C1.). CFCs are nonflammable, noncorrosive, nonex