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Together with the bulk impurity screening campaign, the results enabled us to select the radio-purest construction materials, targeting a $$^{222}$$<\/jats:tex-math>\n \n \n 222<\/mml:mn>\n <\/mml:msup>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula>Rn activity concentration of $$10\\,\\mathrm{\\,}\\upmu \\mathrm{Bq}\/\\mathrm{kg}$$<\/jats:tex-math>\n \n 10<\/mml:mn>\n \n \n \u03bc<\/mml:mi>\n Bq<\/mml:mi>\n \/<\/mml:mo>\n kg<\/mml:mi>\n <\/mml:mrow>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula> in $$3.2\\,\\mathrm{t}$$<\/jats:tex-math>\n \n 3.2<\/mml:mn>\n \n t<\/mml:mi>\n <\/mml:mrow>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula> of xenon. The knowledge of the distribution of the $$^{222}$$<\/jats:tex-math>\n \n \n 222<\/mml:mn>\n <\/mml:msup>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula>Rn sources allowed us to selectively eliminate problematic components in the course of the experiment. The predictions from the emanation measurements were compared to data of the $$^{222}$$<\/jats:tex-math>\n \n \n 222<\/mml:mn>\n <\/mml:msup>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula>Rn activity concentration in XENON1T. The final $$^{222}$$<\/jats:tex-math>\n \n \n 222<\/mml:mn>\n <\/mml:msup>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula>Rn activity concentration of $$(4.5\\pm 0.1)\\,\\mathrm{\\,}\\upmu \\mathrm{Bq}\/\\mathrm{kg}$$<\/jats:tex-math>\n \n (<\/mml:mo>\n 4.5<\/mml:mn>\n \u00b1<\/mml:mo>\n 0.1<\/mml:mn>\n )<\/mml:mo>\n \n \n \u03bc<\/mml:mi>\n Bq<\/mml:mi>\n \/<\/mml:mo>\n kg<\/mml:mi>\n <\/mml:mrow>\n <\/mml:math><\/jats:alternatives><\/jats:inline-formula> in the target of XENON1T is the lowest ever achieved in a xenon dark matter experiment.<\/jats:p>","DOI":"10.1140\/epjc\/s10052-020-08777-z","type":"journal-article","created":{"date-parts":[[2021,4,20]],"date-time":"2021-04-20T12:08:21Z","timestamp":1618920501000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":28,"title":["$$^{222}$$Rn\u00a0\u00a0emanation measurements for the XENON1T experiment"],"prefix":"10.1140","volume":"81","author":[{"name":"XENON Collaboration","sequence":"first","affiliation":[]},{"given":"E.","family":"Aprile","sequence":"additional","affiliation":[]},{"given":"J.","family":"Aalbers","sequence":"additional","affiliation":[]},{"given":"F.","family":"Agostini","sequence":"additional","affiliation":[]},{"given":"M.","family":"Alfonsi","sequence":"additional","affiliation":[]},{"given":"L.","family":"Althueser","sequence":"additional","affiliation":[]},{"given":"F. 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