Science moves us closer to the show which cannot be named and the Hulk! From defensetech.org:

“Unlike regular nuclear bombs, positron bombs wouldn’t eject plumes of
radioactive debris. When large numbers of positrons and antielectrons
collide, the primary product is an invisible but extremely dangerous
burst of gamma radiation. Thus, in principle, a positron bomb could be a
step toward one of the military’s dreams from the early Cold War: a
so-called “clean” superbomb that could kill large numbers of soldiers
without ejecting radioactive contaminants over the countryside.”