Radiation shielding

A shielding apparatus comprising:

• a collagen substrate;
• a plurality of shielding materials embedded in the collagen substrate, the shielding materials each comprising a high-z material, wherein the shielding materials are positioned within the collagen substrate to match positions of a corresponding plurality of radiation sources arranged according to a dosimetric plan, at least some of the radiation sources arranged with gaps between the at least some of the radiations sources and adjacent of the plurality of radiation sources;
• wherein when the apparatus is placed on the plurality of radiation sources,
• each of the shielding materials provides substantial shielding of radiation emitted by a corresponding radiation source and reduced shielding of radiation from other of the plurality of radiation sources;
• and
• gaps between respective shielding materials provide less distortion of magnetic energy than the shielding materials.