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- W2064377341 abstract "An accelerator mass spectrometric (AMS) technique has been developed for determining 41Ca/40Ca ratios at terrestrial levels of 10−16−10−14. Calcium is extracted as calcium oxide from bone and rock samples. The calcium oxide is converted into calcium metal and subsequently into calcium hydride in a two-step reduction process. From these calcium hydride samples 5–10 μA of a negative-ion beam of CaH−3 is produced. A new gas-ionization detector and a high-resolution velocity detector allow discrimination against 41K and the stable isotopes of Ca, resulting in background levels of less than 6 × 10−16. Hence it is possible (for the first time without pre-enrichment) to study the distribution of 41Ca in the terrestrial environment. The AMS method for 41Ca determination is applicable to samples of less than 1 g." @default.
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- W2064377341 date "1990-01-01" @default.
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- W2064377341 title "Sample preparation for the determination of radiocalcium by accelerator mass spectrometry" @default.
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- W2064377341 doi "https://doi.org/10.1016/s0003-2670(00)83465-0" @default.
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