Evaluation of outfield radiation dose in the treatment of breastcancer with hypo-fractionated radiation therapy usingthermoluminescence dosimetry

The aim of the study was to evaluate the outfield radiation dose in the treatment of breast cancer using hypofractionated radiation therapy with thermoluminescence dosimetry, specifically TLD-100 (LiF: Mg, Ti). To assess the variability in TLD responses, we employed the element correction factor (ECF) generation method. For measuring point doses in organs outside the treatment fields, we placed sixteen TLD- 100 chips in nine specific locations within the Rando phantom used for breast cancer radiation treatment (260 cGy x 16 = 41.6 Gy in 16 fractions). The TLDs were read using a Harshaw QS 3500 manual type reader connected to a PC, where we studied and analyzed the thermoluminescence signals. The results indicated that the highest received dose values were observed in the esophagus (≈3960 cGy) and trachea (≈3464 cGy). Furthermore, our findings demonstrate that TLD-100 chips are suitable for measuring point doses in hypofractionated radiotherapy for breast cancer.