“…Scientists have developed reliable faecal bioassay methods for 239 Pu based on alpha spectrometry, thermal ionization mass spectrometry (TIMS), and accelerator mass spectrometry (AMS). [5][6][7] However, as those methods are time consuming for sample preparation (burning, fusion, dissolution, and separation) and counting, it usually takes days to get the final assay results. Therefore, these methods are not suitable for fast population monitoring following an RN emergency.…”