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236 U ( T 1/2  = 23 My) is an excellent monitor for nuclear contamination in the environment. Indeed, spent nuclear fuels present isotopic ratios  236 U/ 238 U several orders of magnitude higher than natural samples.  236 U also provides a useful fingerprint to identify and trace nuclear material for safeguards purposes. Here we describe a new beamline for the discrimination of  236 U using the accelerator mass spectrometry (AMS) technique. This system comprises a Wien velocity filter and a 6.7 m long time-of-flight (ToF) path with a focusing quadrupole. The ToF is determined by a time zero detector and a surface barrier detector, which also provides an energy measurement. The capability of the system to discriminate  236 U from the much more abundant isotopes  235 U and  238 U is shown. While sensitivity values of  236 U/ 238 U∼ 10 −8  were achieved, ongoing works aim to improve this performance.

236U identification in the new AMS beamline at the TANDAR accelerator

²³⁶U identification in the new AMS beamline at the TANDAR accelerator