Resumen: The ANAIS (Annual modulation with NaI(Tl) Scintillators) experiment aims at the confirmation or refutation of the DAMA/LIBRA positive annual modulation signal in the low energy detection rate. ANAIS-112, consisting of nine 12.5 kg NaI(Tl) modules, is taking data since August, 2017 at the Canfranc Underground Laboratory (LSC) in Spain. Results from the analysis of three years of data are compatible with the absence of modulation. The background model developed for all nine ANAIS-112 detectors was established from commissioning data and non-blinded events in the first year of data taking. Now, background characterization is being improved profiting from the larger accumulated exposure available. Here, the background model is described and comparisons of model and measurements for energy spectra and counting rate time evolution for three-year exposure (considering different analysis conditions) are presented. Idioma: Inglés DOI: 10.1088/1742-6596/2156/1/012175 Año: 2022 Publicado en: Journal of Physics: Conference Series 2156 (2022), 012175[4 pp.] ISSN: 1742-6588 Factor impacto SCIMAGO: 0.183 - Physics and Astronomy (miscellaneous)