STRAHLENABSORBIERENDE KUNSTSTOFFBAHN

摘要

The invention relates to a plastic web of high-molecular neutron-moderating polymers with a neutron-absorbing additive containing boron. To obtain a plastic web which is as light as possible and absorbs biologically highly harmful neutrons with an energy in the range from 0.1 to 2 MeV, it is proposed that the plastic web contain first additives with high contents of neutron-scattering heavy metals like manganese, lead, tungsten or iron, and preferably brownstone, and second additives with high contents of wide-band operative neutron absorbers like boron, gadolinium and manganese, and preferably boron carbide, gadolinium oxide and brownstone. The recommended moderating polymer is high-molecular polyisobutylene with a Staudinger index in the range between 415 and 480 cm<3>/g. The neutron-absorbing effect of the plastic web of the invention is based on the combination of moderating, scattering and absorbent materials. The presence of neutron-scattering additives ensures that the trajectory of the scattered neutrons in the plastic web is substantially longer than the geometrical layer thickness so that the likelihood of striking an absorbent atomic nucleus is considerably increased.