There are three primary ways that naturally occurring radioactive isotopes decay: 1  Alpha particle emission. 2  Beta particle emission. 3  Gamma radiation emission.
President condemns Ankara attacks. The current migration crisis is a problem of the entire EU and not of a particular country, Polish President Andrzej Duda said after the end of the Visegrad Group two-day summit in Balatonfuered, Hungary, on Friday.
Thank you, President Duda, for welcoming me today. This is my third visit to Poland as President. I've got very fond memories of my visit here two years ago when I joined Poles in Castle Square to celebrate a quarter century of Polish freedom. And it's wonderful to be back.