A removable implant having a radiation shield adapted to reduce radiation exposure to one or more secondary radio-sensitive tissues during breast cancer radiation therapy is provided herein, the implant including: a flexible casing having: a base adapted for anchoring the implant to a chest wall of a patient a cap disposed on the base and a radiation-absorbing core adapted to absorb at least a portion of cardiac impact zone radiation when compared to a control, wherein the cap encloses the radiation-absorbing core, and wherein the radiation-absorbing core includes: a flexible solid polymer and a plurality of radiation-absorbing members dispersed throughout the flexible solid polymer. In another embodiment, the implant further includes a breast tissue expander disposed on a top face of the flexible casing of the implant. Methods of use of the described implants are also provided herein.
