The BiPo detector for ultralow radioactivity measurements
arXiv:physics/0702070 · doi:10.1063/1.2722062
Abstract
The BiPo project is dedicated to the measurement of extremely low radioactivity contamination of SuperNEMO source foils (^{208}Tl < 2 \muBq/kg and ^{214}Bi < 10 \muBq/kg). The R&D phase is started: a modular BiPo prototype with its shielding test facility is under construction. The goal of this prototype is to study the background and particularly the surface contamination of scintillators. The first capsule has been installed in the Canfranc Underground Laboratory in October, 17th and is now taking data. After 10.7 days of measurements, a preliminary upper limit on the surface radiopurity of the scintillators of A(^{208}Tl) < 60 \muBq/m^2 (90% C. L.) has been obtained.