Cosmic ray-induced reactions on the earths crust and their effect on geochemically measured 'BETA''BETA' half-lives - Rios, P B; Almeida, M; Cybulska, E. W.; Cruz, M T F; Goldman, I D; Oliveira, José Roberto Brandão de; Pascholati, Paulo Reginaldo; Ribas, Roberto Vicençotto; Norman, E B; Zlimen, I (Reuniao de Trabalho sobre Fisica Nuclear No Brasil, 1994)