you use plutonium 246, lead insulation, six pieces of lead coated tubing, water, and a lead suit for extra protection. the plutonium 246 is not as long lasting as plutonium 244 of 236, as its half life is 33 million years; also emits beta particles.
the plutonium core which is inside the lead insulation (7 centimetres of lead; tubing is 2.5 centimetres of lead) is now beeing directed toward the brick wall, due to the beta particles being extremely dangerous, and being distirbuted in rapid amounts, more than a usual plutonium atom, the plutonium breaks down three bricks in the wall, along a vertical path. due to the laws of physics, the wall should lose structural integrity and fall. hopefully.