We investigate soft gluon radiation in hadronic tt production. By taki
ng the top quark decay properly into account, we are able to study the
interplay of radiation both before and after the decay of the top qua
rks. The production-decay and decay-decay radiative interferences depe
nd sensitively on the relative size of the gluon energy and the decay
width. Radiation patterns for various production mechanisms are compar
ed.