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.
Mieszko's son, Duke BolesÅaw I Chrobry (r. 992â1025), established a Polish Church structure, pursued territorial conquests and was officially crowned the first king of Poland in 1025, near the end of his life.