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The development of advanced security materials with multimodal optical responses is of increasing relevance for anticounterfeiting technologies. In this study, we report the successful synthesis and comprehensive characterization of a multifunctional composite based on cellulose nanofibrils (CNFs) covalently functionalized with photochromic PSPA oligomers and cross-linked with upconversion nanoparticles (UCNPs). [...]

Prompt Gamma Activation Analysis (PGAA) is apowerful non-destructive assay for toxic elementssuch as Cd, Hg or Pb in radioactive packages [1,2]. Inparticular, for long-lived actinides, e.g [...]