HIGH-RESOLUTION DOSIMETRY USING RADIOCHROMIC FILM AND A DOCUMENT SCANNER

A method of reading exposed radiochromic film is described which has s ignificant advantages over conventional densitometry. The method emplo ys a document scanner and associated software for imaging the film. Th e resulting images are easily analysed using standard software to yiel d high-resolution dose maps. A calibration was performed which relates scanner signal to dose, allowing for the determination of dose at any point on an exposed film. Results obtained using a broad-band densito meter are compared to those where the scanner has been used. The techn ique was used to measure the dose distribution around a COMS-type opht halmic applicator.