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Phys. J. C"],"abstract":"<jats:title>Abstract<\/jats:title><jats:p>The selection of low-radioactive construction materials is of the utmost importance for rare-event searches and thus critical to the XENONnT experiment. Results of an extensive radioassay program are reported, in which material samples have been screened with gamma-ray spectroscopy, mass spectrometry, and <jats:inline-formula><jats:alternatives><jats:tex-math>$$^{222}$$<\/jats:tex-math><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:msup>\n                    <mml:mrow\/>\n                    <mml:mn>222<\/mml:mn>\n                  <\/mml:msup>\n                <\/mml:math><\/jats:alternatives><\/jats:inline-formula>Rn emanation measurements. Furthermore, the cleanliness procedures applied to remove or mitigate surface contamination of detector materials are described. Screening results, used as inputs for a XENONnT Monte Carlo simulation, predict a reduction of materials background (<jats:inline-formula><jats:alternatives><jats:tex-math>$$\\sim $$<\/jats:tex-math><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:mo>\u223c<\/mml:mo>\n                <\/mml:math><\/jats:alternatives><\/jats:inline-formula>17%) with respect to its predecessor XENON1T. Through radon emanation measurements, the expected <jats:inline-formula><jats:alternatives><jats:tex-math>$$^{222}$$<\/jats:tex-math><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:msup>\n                    <mml:mrow\/>\n                    <mml:mn>222<\/mml:mn>\n                  <\/mml:msup>\n                <\/mml:math><\/jats:alternatives><\/jats:inline-formula>Rn activity concentration in XENONnT is determined to be 4.2\u00a0(<jats:inline-formula><jats:alternatives><jats:tex-math>$$^{+0.5}_{-0.7}$$<\/jats:tex-math><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:msubsup>\n                    <mml:mrow\/>\n                    <mml:mrow>\n                      <mml:mo>-<\/mml:mo>\n                      <mml:mn>0.7<\/mml:mn>\n                    <\/mml:mrow>\n                    <mml:mrow>\n                      <mml:mo>+<\/mml:mo>\n                      <mml:mn>0.5<\/mml:mn>\n                    <\/mml:mrow>\n                  <\/mml:msubsup>\n                <\/mml:math><\/jats:alternatives><\/jats:inline-formula>)\u00a0<jats:inline-formula><jats:alternatives><jats:tex-math>$$\\upmu $$<\/jats:tex-math><mml:math xmlns:mml=\"http:\/\/www.w3.org\/1998\/Math\/MathML\">\n                  <mml:mi>\u03bc<\/mml:mi>\n                <\/mml:math><\/jats:alternatives><\/jats:inline-formula>Bq\/kg, a factor three lower with respect to XENON1T. This radon concentration will be further suppressed by means of the novel radon distillation system.<\/jats:p>","DOI":"10.1140\/epjc\/s10052-022-10345-6","type":"journal-article","created":{"date-parts":[[2022,7,8]],"date-time":"2022-07-08T15:09:54Z","timestamp":1657292994000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":37,"title":["Material radiopurity control in the XENONnT experiment"],"prefix":"10.1140","volume":"82","author":[{"given":"E.","family":"Aprile","sequence":"first","affiliation":[]},{"given":"K.","family":"Abe","sequence":"additional","affiliation":[]},{"given":"F.","family":"Agostini","sequence":"additional","affiliation":[]},{"given":"S.","family":"Ahmed Maouloud","sequence":"additional","affiliation":[]},{"given":"M.","family":"Alfonsi","sequence":"additional","affiliation":[]},{"given":"L.","family":"Althueser","sequence":"additional","affiliation":[]},{"given":"E.","family":"Angelino","sequence":"additional","affiliation":[]},{"given":"J. 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