Abstarct: One of the chalenges in individual and ambient dosimetry in Iran is the lack of standard fields with various energies for calibrating the dosimeters. For dosimetry in the photon fields, the only available standard fields are the two sources Cs-137 and Co-60 in Karaj Secondary Standard Dosimetry Lab (SSDL). Due to dependence of dosimeters response on the photon energy, different responses per unit dose-equivalent will be obtained in the fields with different energies. Therefore, significant uncertaintay would be imposed to the personal or ambient dose-equivalent obtained in the fields with energies different from the calibration field. To solve this problem, it is required to correct the response in different energies or decrease the dependence of dosimeter response on the photon energy. Beside the energy, the direction of radiation is another factor affecting the response .In this research, above point is investigated for the personal dosimeters baxsed on TLD-100 and GR-200 chips used in the Nuclear Science anf Technology Research Institute (NSTRI). Energy and angular responses of this dosimeter in different energies and angles are computed by Monte Carlo method using MCNP4C code. To validate the calculations, simulation results in Cs-137 and Co-60 energies were compared with the experimental data. Obtained results revealed that for the energies greater than 300 keV, the response is independent of photon energy within 5% deviation. But, for the energies smaller than 300 keV there was large dependency on the photon energy so that the response in 40 keV was observed twice the response in Cs-137 and Co-60 energies. On the other hand, for a given energy, the responses for the angles larger than 60 degree showed considererable uncertainty. In addition, larger uncertainties in the response was obsereved for smaller energies Finally, applying the calculated responses, a correction factor was determined for every energy and angle. Also, in order to optimize the dosimeter response and decrease the dependency of its response on the photon energy, a cadmium filter with 0.7 mm thickness was considered inside the dosimeter badge in front of the TLD chip. This filter presented satisfactory result so that an energy independent response from 40 keV to 3 MeV within a maximum uncertainty of 10%. Moreover, between 0 and 90 degree the angular response with a maxmum uncertainty of 30% was obtained.