Resumen: Cosmogenic activation is the most common source of radioactivity in copper, being 60 Co the most significant because of its long half-life (5.27 y) and saturation activity at sea level of 1 mBq/kg. Copper bricks, which had been exposed to cosmic rays for 41 days after their casting, were used to replace the internal 10 cm of the lead shielding of a HPGe detector placed at the Canfranc Underground Laboratory. We describe the outcome of the new shielding and the cosmogenic and primordial radioisotopes observed. Idioma: Inglés DOI: 10.1088/1742-6596/718/4/042049 Año: 2016 Publicado en: Journal of physics. Conference series 718, 4 (2016), 042049 [5 pp.] ISSN: 1742-6588 Factor impacto SCIMAGO: 0.24 - Physics and Astronomy (miscellaneous) (Q3)