[en] Full text: Besides of the well-established use in medical applications, gamma radiation is increasingly present in industrial processes. Reliable dosimetry is a key element for the quality assurance in radiation processing. In the present work, we proposed a terbium-doped glassy material as an active part of a photonic gamma radiation dosimeter, which works at the same time by visual inspection for qualitative detection of dose ranges and by CIE Color Coordinates monitoring, for quantitative measurements. The presented results were obtained in glasses of BKLM family (H₃BO₃ - K₂CO₃ - Li₂CO₃ - MgF₂ ) as an active host matrix, doped with Tb³⁺ for photonic activity. The material was prepared by melting in a resistive furnace at 950 °C for 1 hour, followed by a thermal quenching in a graphite mould at room temperature. The BKLM:Tb³⁺ glasses were exposed to different doses of g radiation. Inside a radiation chamber with a gamma ⁶⁰Co source, the samples were irradiated in a dose range of 100 Gy to 50 kGy. The correlation between the g dose previously received by each sample and the displacement of the color coordinate (CIE) of its luminescence, under UV (360 nm) excitation, was obtained using the Spectra Lux^TM software [1]. We observed two dose-dependent processes: a quantum efficiency change from the green Tb³⁺ luminescence, and a creation of color centers, causing the darkening of the material by defects generated in the glass network. The competition between these effects, results in an emission with color-coordinate affected as a function of radiation dose received. We observed CIE x,y,z coordinate changing from (0.297;0.567;0.136) to (0.367;0.493;0.140) from 0 Gy to 25 kGy. The results support the viability of BKLM:Tb³⁺ glass as a photonic dosimeter, towards RGB dosimetry devices in multi doped samples, with CIE color coordinate as a function of gamma radiation dose. Reference:[1] Spectra Lux Software 2.0, Ponto Quântico Nanodispositivos-UFPE, INPI00061673, 2004 P.A. Santa-Cruz, F.S. Teles. (author)