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​X-rays are important in diagnostic radiology. If the users lack of understanding of radiation and protection from radiation and proper may cause harm to the workers. Principles of radiation protection are defined by International Commission on Radiological Protection; ICRP) has determined the principles of radiation protection As Low As Reasonably Achievable (ALARA) is the time, distance and shielding. Which reduces the exposure to radiation and can reduce the radiation dose received. Increasing distance from the radiation source can reduce the amount of radiation according to the inverse square law and proper protection is important. In medical radiation shield to materials with high quality. Material commonly used for radiation protection is the lead (Pb). Lead is toxic to the environment in the process. This research studies the properties to prevent X-rays of the elements dysprosium (Dy) by the radiation shielding properties of 59P2O5: 10Al2O3: 20 Na2O: 10 Gd2O3: 1Dy2O3 With 60-120 kVp 200 mA 0.1 s. The results showed that when the concentration of dysprosium is increased. The linear attenuation coefficient and the mass attenuation coefficient increase with increasing of Dy2O3 content in glass matrix. The half value layer (HVL) and the tenth value layer (TVL). And when the X-ray energy is increase value, the linear attenuation coefficient and the mass attenuation coefficient decrease were HVL and TVL are increasing value. The comparison results show that the properties of HVL value in the glass sample was less than the general glass, concrete, and block. The properties of radiation shielding glass in the example has a value of nearby lead glass used in x-ray department. From this research found that the glass example Dy3+ with masking properties of radiation, which are ideal for improved substitution of lead glass in the future.