10 implantable radiation therapy devices consisting primarily of radioactive carrier devices and delivery devices for use in the diagnosis and treatment of cancers; brachytherapy medical devices and apparatus for treating cancer; medical devices and apparatus for brachytherapy, namely, devices for implanting radiation therapy devices; implantable radiation therapy devices; implantable radiation therapy devices, namely, radioactive seeds, spacers, markers, and calibration seeds; implantable radiation therapy devices packaged in strands, mesh, cartridges, sutures, trays, kits, and needles; implantable radiation therapy devices and delivery devices therefor