Literature, most generically, is any body of written works. More restrictively, literature writing is considered to be an art form, or any single writing deemed to have artistic or intellectual value, often due to deploying language in ways that differ from ordinary usage.
For radionuclides at trace concentrations, there can be a very gradual and slow transition from reversible surface sorption to irreversible incorporation into solids. A new EU-funded study has shed important light on such mechanisms.