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The BiPo-3 detector, running in the Canfranc Underground Laboratory(Laboratorio Subterr\'aneo de Canfranc, LSC, Spain) since 2013, is alow-radioactivity detector dedicated to measuring ultra low naturalradionuclide contaminations of $^{208}$Tl ($^{232}$Th chain) and $^{214}$Bi($^{238}$U chain) in thin materials. The total sensitive surface area of thedetector is 3.6 m$^2$. The detector has been developed to measure radiopurityof the selenium double $\beta$-decay source foils of the SuperNEMO experiment.In this paper the design and performance of the detector, and results of thebackground measurements in $^{208}$Tl and $^{214}$Bi, are presented, andvalidation of the BiPo-3 measurement with a calibrated aluminium foil isdiscussed. Results of the $^{208}$Tl and $^{214}$Bi activity measurements ofthe first enriched $^{82}$Se foils of the double $\beta$-decay SuperNEMOexperiment are reported. The sensitivity of the BiPo-3 detector for themeasurement 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.

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