Meitner na-arụ ọrụ na chemist Otto Hahn na ya chọpụtara ọtụtụ isotopes ọhụrụ. N'afọ 1909, o gosipụtara akwụkwọ abụọ na beta radiation. Ya na Otto Hahn, ọ chọpụtakwara ma mepụta usoro nkewapụ anụ ahụ a maara dị ka redioactive recoil, nke a na-esi na nwa nwa a na-achụpụ site na matriks ya ka ọ na-alaghachi na oge nke ire ere. Ajụjụ: Onye nyeere ya aka ịchọpụta isotopes ọhụrụ?
Otto Hahn