Patent Number: 
Section: claims

1. A subdermal lighting apparatus with enhanced operational longevity, safety and biological compatibility with a user, the subdermal lighting apparatus comprising:a housing unit configured to store a radioactive isotope;a phosphor layer affixed to an interior surface of the housing unit and configured to interact with radiation emitted by the radioactive isotope to generate visible light;a radiation shielding layer disposed around the housing unit and configured to enable the generated visible light to pass through; anda biologically safe layer disposed around the radiation shielding layer and configured to enable the generated visible light to pass through, wherein the biologically safe layer is configured to serve as a barrier between the radiation shielding layer and biological tissue of the user, thereby enhancing user safety of the apparatus. 2. The subdermal lighting apparatus of claim 1, wherein the radioactive isotope is tritium. 3. The subdermal lighting apparatus of claim 2, wherein the housing unit is made from borosilicate glass. 4. The subdermal lighting apparatus of claim 3, wherein the radiation shielding layer is made from lead oxide glass. 5. The subdermal lighting apparatus of claim 4, wherein the lead oxide glass comprises a thickness of approximately 0.35 millimeters or less. 6. The subdermal lighting apparatus of claim 4, wherein the biologically safe layer is made from borosilicate glass. 7. The subdermal lighting apparatus of claim 6, wherein the borosilicate glass comprises a thickness of approximately 0.1-1.0 millimeters.