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- W2013183714 abstract "We have developed a new method for the collection, purification, and measurement of natural levels of 32P and 33P in rain, marine particulates, and dissolved constituents of seawater. 32P and 33P activities were measured using a recently developed ultra-low-level liquid scintillation counter. Measurement by liquid scintillation counting allows, for the first time, simultaneous measurement of both 32P and 33P. Furthermore, 33P activities are measured with high efficiency (>50%), regardless of the amount of stable phosphorus in the sample. Liquid scintillation also produces energy specific β spectra which has enabled us to identify previously unrecognized β-emitting contaminants in natural samples. In order to remove these contaminants, new methods of purification have been developed which utilize a series of precipitations and anion and cation exchange columns. Rainwater and dissolved seawater samples were extracted from large volumes of rain- and seawater, 5−20 and >5000 L, respectively, using iron-impregnated polypropylene filters. On these filters, it was possible to load between 25 and 30% Fe(OH)3 by weight, over twice that loaded on previously utilized materials. Using our collection, purification, and liquid scintillation counting techniques, it was possible to obtain specific 32P and 33P activities with less than 10% error (2σ) in rainwater and 20% error (2σ) in seawater." @default.
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- W2013183714 date "1998-01-01" @default.
- W2013183714 modified "2023-10-17" @default.
- W2013183714 title "Measurement of Cosmogenic <sup>32</sup>P and <sup>33</sup>P Activities in Rainwater and Seawater" @default.
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- W2013183714 doi "https://doi.org/10.1021/ac9707500" @default.
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