The thermal neutron experiment verifies the assumption that the boric acid solution
works for attenuating thermal neutron. The results have shown that by filling foam with
water or boric acid solution, the attenuation got improved compared to bulk material and
foam. Foams filled with boric acid solution have the most obvious attenuating effect. By 109
increasing the boric acid concentration and thickness of the layers, the samples even totally
stopped the beam.