"whether including antimatter or
not, to dispose of the surplus of decaying bodies in a speedy and sanitary way."
Using the convention that 1 kiloton TNT equivalent= 4.184×1012
joules (or one trillion calories of energy), one half gram of
antimatter reacting with one half gram of ordinary matter (one gram
total) results in 21.5 kilotons-equivalent of energy (the same as the atom bomb dropped on Nagasaki in 1945).
1 pound=453 grams and I'll assume each corpse weighs on average 150 pounds. 453x150 = 67,950.
67,950 Nagasaki bombs going off with each corpse disposed of in this way. Times billions of corpses. Pretty dumb idea.