Material screening and selection for XENON100

Results of the extensive radioactivity screening campaign to identify materials for the construction of XENON100 are reported. This dark matter search experiment is operated underground at Laboratori Nazionali del Gran Sasso (LNGS), Italy. Several ultra sensitive High Purity Germanium detectors (HPGe) have been used for gamma ray spectrometry. Mass spectrometry has been applied for a few low mass plastic samples. Detailed tables with the radioactive contaminations of all screened samples are presented, together with the implications for XENON100.

► Material selection based on their intrinsic radioactive contaminations is crucial for low background experiments.
► We present detailed results from the material screening and selection campaign for the XENON100 dark matter experiment.
► The measurements were performed using low background gamma-ray spectrometry and mass spectrometry.