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An alpha–gamma coincidence spectrometry (AGCS) system was developed at the International Atomic Energy Agency's (IAEA) Safeguards Analytical Laboratory (SAL) in order to improve the detection of alpha–gamma emitting radionuclides of relevance for safeguards, such as 239 Pu and 241 Am. The AGCS design was based upon a linear gate, whose resolving time is dependent upon the amplifiers’...