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In this research paper, we report on the radiation shielding ability of five newly developed chalcogenide alloys described by the chemical compositions of Ge 20 Sb 6 Te 72 Bi 2 (GTSB1), Ge 20 Sb 6 Te 70 Bi 4 (GTSB2), Ge 20 Sb 6 Te 68 Bi 6 (GTSB3), Ge 20 Sb 6 Te 66 Bi 8 (GTSB4), and Ge 20 Sb 6 Te 64 Bi 10 (GTSB5). The simulation (Monte Carlo) technique is systematically utilized to understand the problem of radiation propagation through the chalcogenide alloys. The maximum deviation between the theoretical values and simulations outcomes for each alloy sample corresponds to circa 0.525, 0.517, 0.875, 0.619, and 0.574% for GTSB1, GTSB2, GTSB3, GTSB4, and GTSB5, respectively. The obtained results indicate that the rapid decline in the value of the attenuation coefficients is mainly due to the main photon interaction process with the alloys for E ≤ 500 keV. Additionally, the charged particle and neutron transmission properties are assessed for the involved chalcogenide alloys. Comparing the MFP and HVL with those of the conventional shielding glasses and concretes, the present alloys are good photon absorbers and they could be used to replace some conventional shields in radiation protection applications. • High Te content chalcogenide alloys were reported for radiation shielding applications. • Monte Carlo method was successfully applied in the design of vacuum system for radiation propagation. • The optimum thickness for narrow beam transmission geometry is less than 0.1 cm. • GTSB5 alloys can conveniently replace the traditional materials. [ABSTRACT FROM AUTHOR]