The sensitivity of experiments searching for rare event physics is dictated to a large extent by the background level achieved. Thus, it is imperative to carefully study the background, determining its nature and location, in order to develop strategies leading to its rejection. That goes in parallel with the development of state-of-the-art ultra-low background techniques for producing and measuring radio-pure materials, and is a common issue in all searches in Neutrino Physics and Astroparticle Physics.
The underground laboratories have, as their main objective, to provide the conditions needed for such low background experiments, i.e. a deep underground site to avoid cosmic radiation and the provision of the most advanced technologies to deal with all sources of background and drive them to their lowest level.

The main objective of activity LBT-DUSL is to identify and measure the different backgrounds (intrinsic, induced and environmental) contributing to a given experiment, and to design methods and techniques (shielding, vetoes, and identification and discrimination mechanisms) to suppress them. For that purpose a comprehensive R&D program on the improvement and implementation of ultra-low background techniques will be carried out cooperatively in the four European Underground Laboratories: Laboratori Nazionali del Gran Sasso (LNGS-Italy), Laboratorio Subterraneo de Canfranc (LSC-Spain), Laboratoire Souterrain de Modane (LSM-France) and Boulby Underground Lab (IUS-UK). This research will also benefit from the collaboration established with the teams of the experiments being performed in the various Underground Laboratories and, in particular with the researchers of the Networks N3 (DMD), N4 (DBD) and that the Joint Research Activity JRA2 (IDEA).

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Coordinators: Julio Morales and J.M. Carmona
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Deputy-Coordinator: Matthias Laubenstein