The BiPo-3 detector for the measurement of ultra low natural radioactivities of thin materials

A.S. Barabash , A. Basharina-Freshville , E. Birdsall , S. Blondel , S. Blot , M. Bongrand , D. Boursette , V. Brudanin

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J. Busto A.J. Caffrey S. Calvez M. Cascella S. Cebri\'an C. Cerna J.P Cesar E. Chauveau A. Chopra T. Dafn\'i S.De Capua D. Duchesneau D. Durand V. Egorov G. Eurin J.J. Evans L. Fajt D. Filosofov R. Flack X. Garrido H. G\'omez B. Guillon P. Guzowski K. Hol\'y R. Hod\'ak A. Huber C. Hugon F.J. Iguaz I.G. Irastorza A. Jeremie S. Jullian M. Kauer A. Klimenko O. Kochetov S.I. Konovalov V. Kovalenko K. Lang Y. Lemi\`ere T. Le Noblet Z. Liptak X.R. Liu P. Loaiza G. Lutter G. Luz\'on M. Macko F. Mamedov C. Marquet F. Mauger B. Morgan J. Mott I. Nemchenok M. Nomachi F. Nova H. Ohsumi G. Olivi\'ero A. Ortiz de Sol\'orzano R.B. Pahlka J. Pater F. Perrot F. Piquemal P. Povinec P. P\v{r}idal Y.A. Ramachers A. Remoto B. Richards C.L. Riddle E. Rukhadze R. Saakyan R. Salazar X. Sarazin Yu. Shitov L. Simard F. \v{S}imkovic A. Smetana K. Smolek A. Smolnikov S. S\"oldner-Rembold B. Soul\'e I. \v{S}tekl J. Thomas V. Timkin S. Torre Vl.I. Tretyak V.I. Tretyak V.I. Umatov C. Vilela V. Vorobel D. Waters A. \v{Z}ukauskas

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classification ⚛️ physics.ins-det

keywords detectorbipo-3measurementfoilssupernemobetacanfrancchain

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The BiPo-3 detector, running in the Canfranc Underground Laboratory (Laboratorio Subterr\'aneo de Canfranc, LSC, Spain) since 2013, is a low-radioactivity detector dedicated to measuring ultra low natural radionuclide contaminations of $^{208}$Tl ($^{232}$Th chain) and $^{214}$Bi ($^{238}$U chain) in thin materials. The total sensitive surface area of the detector is 3.6 m$^2$. The detector has been developed to measure radiopurity of the selenium double $\beta$-decay source foils of the SuperNEMO experiment. In this paper the design and performance of the detector, and results of the background measurements in $^{208}$Tl and $^{214}$Bi, are presented, and validation of the BiPo-3 measurement with a calibrated aluminium foil is discussed. Results of the $^{208}$Tl and $^{214}$Bi activity measurements of the first enriched $^{82}$Se foils of the double $\beta$-decay SuperNEMO experiment are reported. The sensitivity of the BiPo-3 detector for the measurement of the SuperNEMO $^{82}$Se foils is $\mathcal{A}$($^{208}$Tl) $<2$ $\mu$Bq/kg (90\% C.L.) and $\mathcal{A}$($^{214}$Bi) $<140$ $\mu$Bq/kg (90\% C.L.) after 6 months of measurement.

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The BiPo-3 detector for the measurement of ultra low natural radioactivities of thin materials

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