Development of a transparent and deformable two dimensional radiochromic gel dosimeter

Achieving accurate small field dosimetry is challenging; however, an accurate dose verification tool to evaluate the delivered dose distribution of radiotherapy is essential. In this research, a 2D radiochromic gel dosimeter is developed and characterized. A radiosensitive dye, leucomalachite green (LMG) is dissolved in gelatin. The changes in absorbencies of the gels were measured as a function of absorbed dose and a linear dose response is achieved above 10Gy. The gels were then irradiated using complicated Intensity-modulated radiation therapy (IMRT) beams and their dose distributions were compared to their respective simulated/calculated planar dose maps.