Gamma-ray energy deposition measurements were made in a simulated fast reactor blanket of the Purdue University Fast Breeder Blanket Facility (FBBF) using CaF2:Dy thermoluminescent dosimeters (TLDs). The TLDs were encased in either stainless steel or lead sleeves, and cavity ionization theory corrections known as f factors were used to relate the TLD dose to the sleeve dose. Corrections for the neutron response of the TLDs were made by determining the relative contributions of the TLDs neutron and gamma-ray responses.