100 research outputs found
Liver fluke (Fasciola hepatica) infection in cattle in Northern Ireland: a large-scale epidemiological investigation utilising surveillance data
Animal-based agriculture, phosphorus management and water quality in Brazil: options for the future
Liver fluke (Fasciola hepatica) infection in cattle in Northern Ireland: a large-scale epidemiological investigation utilising surveillance data
ExigĂȘncias nutricionais de zinco para frangos de corte machos e fĂȘmeas na fase inicial
Perda de nutrientes via escoamento superficial no sistema plantio direto sob adubação mineral e orgùnica
Polymorphism: an evaluation of the potential risk to the quality of drug products from the FarmĂĄcia Popular Rede PrĂłpria
DIELECTRIC CONSTANTS AND REFRACTIVE INDICES OF SOLUTIONS OF SOME ORGANOPHOSPHORUS COMPOUNDS IN n-OCTANE.
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Alpha liquid scintillation counting: past, present, and future
Beta liquid scintillation counting has been used for about 30 years, and its effectiveness for alpha particles has been known for almost that long; however, the technique has not been widely applied to alpha particle detection because of poor energy resolution, high background, and variable interference from beta and gamma radiation. Beginning with the work of Horrocks in the early 1960s, improvements in energy resolution and background rejection have been made. Further developments at Oak Ridge National Laboratory over the past 10 to 12 years have resulted in improved methods of sample preparation (using liquid-liquid extraction methods to isolate the sample and introduce it into the scintillator) and better instrumentation, including electronic rejection of beta and gamma pulses. Energy resolutions of 200- to 300-keV FWHM and background counts of 0.01 cpm are now routine. Alpha liquid scintillation spectrometry is now suitable for a wide range of applications, from the accurate quantitative determination of relatively large amounts of known nuclides in laboratory-generated samples to the detection and identification of very small, subpicocurie amounts of alpha emitters in environmental-type samples. Suitable nuclide separation procedures, sample preparation methods, and instrument configurations are outlined for a variety of analyses
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High-resolution liquid scintillation method for the analytical determination of alpha-emitters in environmental samples
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