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• W1919342875 abstract "Actinide isotopes are present in environmental samples at ultra-trace levels ( 236 U concentration is quoted to be on the order of pg/kg or fg/kg). Their detection requires the resolution of mass spectrometry (MS) techniques, but only accelerator mass spectrometry (AMS) has the sensitivity required. In order to perform the isotopic ratio measurements of actinides, such as 236 U/ 238 U, an upgrade of the Center for Isotopic Research on Cultural and Environmental Heritage accelerator (CIRCE) in Caserta, Italy, has been performed. The system was originally equipped for radiocarbon AMS measurements. The main difficulty of AMS measurement of 236 U is the intense neighboring beam of 238 U. Although most of the 238 U ions are suppressed by means of magnetic and electrostatic elements, a small fraction of this intense beam can interfere with the rare isotopes. This paper reports the preliminary results of the 236 U/ 238 U isotopic ratio measurement limit (<5.6 x 10 –11 ), aimed also to better understand the origin of background ions. For this purpose, a large 16-strip silicon detector providing spatial resolution has been used. In addition, calculations to assess the performance of the system obtained by adding a high-resolution time of flight-energy (TOF-E) detector are discussed." @default.
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• W1919342875 date "2010-01-01" @default.
• W1919342875 modified "2023-09-30" @default.
• W1919342875 title "Optimization of ²³⁶U AMS at CIRCE" @default.
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• W1919342875 doi "https://doi.org/10.1017/s003382220004532x" @default.
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