LAUSR

In the application of radiotherapy to the skin, the need for ensuring the accuracy of surface dose measurements has attracted increasing attention because dose accumulation and inaccurate skin registration during irradiation can compromise patient safety. Here, we develop a dosimeter with mechanical stability against bending by mixing a photoconductive material, HgI2, and silicon rubber binder. We fabricate a film-type unit cell dosimeter and evaluate the device performance in terms of reproducibility and linearity. We also fabricate a flexible array dosimeter to demonstrate the feasibility of accurate surface dose measurements. To evaluate the robustness of the proposed device to bending, an acrylic filter is applied to form a beam, and the signals measured on flat and curved substrates are compared. The reproducibility values of the film-type unit cell dosimeter are 0.6% (SE) at 6 MV and 1.4% (SE) at 15 MV. The linearity values are 0.9999 (R2) at 6 MV and 0.9981 (R2) at 15 MV. The surface dose measurement error rates are 11.073% at 6 MV and 3.318% at 15 MV, demonstrating the feasibility of the flexible array dosimeter.