The SuperNEMO ββ source production

SuperNEMO takes advantage of the tracking calorimetry technique successfully used by NEMO3. This technique reduces the backgrounds and allows for excellent discrimination of different 0νββ mechanisms. SuperNEMO can simultaneously observe different double beta emitters, 48Ca, 82Se and 150Nd are currently under consideration. The demonstrator will employ 7~kg of enriched 82Se shaped in thin foil installed in the centre of the detector. The R&D for new techniques of foil fabrication will be described, focusing on materials choice and background reduction at the level of 2μBq/kg and 10μBq/kg for 208Tl and 214Bi respectively. New developments with innovative purification methods will also be discussed with the aim of comparing the radio-purities at a later stage.