CaSO4: Dy thermoluminescent dosimeters (TLD) disc known as TLD-900 is widely used for personal dosimetry purposes. An optimum response dosimeter procedure can be determined from its characteristics. The equivalent dose limitation for hands and feet or skin Hp (0.07) of 500 mSv/year. Therefore, we need a device to measure the radiation dose to optimize the safety of radiation workers so do not exceed the limit detection. The research objective is to produce accurate dosimeters by testing the characteristics of personal dosimeters according to ISO 12794: 2000. Tests of 129 dosimeters were tested with dosage variations of 0.3, 0.5, 1, 3, and 5 mSv in the 90Sr beta, gamma 137Cs, and x-ray voltage 20-100 kV in Secondary Standard Dosimeter Laboratory (SSDL). The results of tests obtained the dosimeter’s dependence on angle variations is relatively small and has a high energy dependency. Obtaining a dosimeter limit for the detection of extremities for beta and photon radiation less than 1 mSv with the lowest sensitivity being at 80 keV of 24 µSv. The dosimeter response to extremity is good, evidenced by the reading values within the trumpet curve range set by the IAEA and EURADOS.