We developed a single sphere spectrometer (SSS) with a gold foil detector for neutron spectrometry. The detector of SSS is seven gold foil with 11 mm diameter and 0.18 mm thickness, which is placed in the polyethylene sphere of 30 cm diameter. The response of the detector was calculated for neutron in energy range 1×10−9 MeV up to 1 × 102 MeV using the Monte Carlo method by the MCNPX code system. The calculations were done based on the input of the SSS geometry model, source radiation, and fluence tally models. The validation of this SSS response was done with measure the neutron spectra from 252Cf standard source at the neutron calibration laboratory of the Center for Technology of Radiation Safety and Metrology, National Nuclear Energy Agency, and compared with Bonner Sphere Spectrometer (BSS) LiI(Eu). Based on this comparison, it was known that the SSS Au foils measurement differs from the BSS LiI(Eu) by about 1%.

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.

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