Author/Authors :
Arnold، نويسنده , , R. and Augier، نويسنده , , C. and Barabash، نويسنده , , A. and Blum، نويسنده , , D. and Brudanin، نويسنده , , V. and Campagne، نويسنده , , J.E. and Dassié، نويسنده , , D. and Egorov، نويسنده , , V. and Eschbach، نويسنده , , R. and Guyonnet، نويسنده , , J.L. and Hubert، نويسنده , , F. and Hubert، نويسنده , , Ph. and Jullian، نويسنده , , S. and Kisel، نويسنده , , I. and Kochetov، نويسنده , , O. and Kornoukov، نويسنده , , V.N.، نويسنده ,
Abstract :
In the double beta decay (ββ) experiment NEMO-2, the 214Bi radioactivity has been measured as background for the ββ processes. The analysis of the 214Bi contamination has been performed via the signature of 214Po alpha decay. This method has been applied to data taken with enriched 100Mo and 116Cd sources. At the level of NEMO-2ʹs sensitivity, in a 1.0 mole yr study of enriched material, the contamination of the sources can be measured in the range of 2.0 mBq kg−1. The effects of deposited contamination by 222Rn are also discussed and estimated at the level of 0.3 mBq per square meter of source foil. Backgrounds for neutrinoless double beta decay (ββ0v) are deduced from these measurements and the consequences for the higher sensitivity ββ experiment NEMO-3 are drawn.
