Particle analysis of single uranium-bearing particle is one of the most important techniques in environmental monitoring of nuclear safeguards.As a reliable and routine technique,fission track analysis combined with thermal ionization mass spectrometry(FT-TIMS)is complex Particle analysis of single uranium-bearing particle is one of the most important techniques in environmental monitoring of nuclear safeguards. As a reliable and routine technique, fission track analysis combined with thermal ionization mass spectrometry (FT-TIMS) is complex