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The purpose of this work was to present the fundamental dosimetric characteristics of a hypothetical 153 Gd brachytherapy source using the AAPM TG-43U1 dose-calculation formalism. Gadolinium-153 is an intermediate-energy isotope that emits 40–100 keV photons with a half-life of 242 days. The rationale for considering 153 Gd as a brachytherapy source is for its potential of patient specific shielding and to enable reduced personnel shielding requirements relative to 192 Ir, and as an isotope for interstitial rotating shield brachytherapy (I-RSBT). A hypothetical 153 Gd brachytherapy source with an active core of 0.84 mm diameter, 10 mm length and specific activity of 5.55 TBq of 153 Gd per gram of Gd was simulated with Geant4. The encapsulation material was stainless steel with a thickness of 0.08 mm. The radial dose function, anisotropy function and photon spectrum in water were calculated for the 153 Gd …