The long-term stability on basic performances of a diisopropylnaphthalene-based liquid scintillation cocktail

► LSC cocktails with a span of 18 years of storage have been compared. ► The 18-year storage has no significant impact on the basic performances. ► Ultima Gold AB has very good long-term stability on the basic performances. ► The statistical fluctuation has influence on the quench parameter SQP(E).