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Byrnes, NEXT Collaboration: C. Cortes-Parra, N. L\\'opez-March, P.A.O.C. Silva, P. Dietz, P. Ferrario, P. Ferrero Manche\\~no, P. Herrero-G\\'omez, P. Lebrun, P. Novella, P.R.G. Valle, P. Saharia, P. V\\'azquez Cabaleiro, R. Coupe, R.D.P. Mano, R. Esteve, R. Felkai, R. Guenette, R.L. Miller, R. Madigan, S. Ayet, S.R. Soleti, S. Teruel-Pardo, S. Torelli, V. \\'Alvarez, V. Herrero, X. Cid, Y. Ayyad, Y. Ifergan, Z. Freixa","submitted_at":"2026-04-21T16:04:32Z","abstract_excerpt":"The NEXT-100 detector at the LSC aims at the first competitive search for the \\bbnonu decay using a high-pressure \\Xe{136} electroluminescent time projection chamber. The first low-background run of NEXT-100 at 3.95 bar has been devoted to the measurement of the radon-induced backgrounds impacting this search. The contributions from both the internal and external airborne radon have been evaluated. The internal \\Rn{222} activity is found to be (0.95$\\pm$0.04(stat)$\\pm$0.09(sys)) Bq/m$^3$, while no traces of \\Rn{220} have been observed. 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