ABSTRACT
The ferrous sulfate-benzoic acid–xylenol orange (FBX) dosimetry system in aqueous form has found utility in several types of applications with photon- and electron-based radiotherapy. The optical density measurements for dose estimation in the FBX were earlier performed with spectrophotometers. This chapter presents the work that involved standardization of the FBX dosimetry system in hospital conditions utilizing the “in-house” facilities such as a colorimeter in place of a costly spectrophotometer. Measurement of chemical changes brought about by ionizing radiation in a system for quantifying the radiation dose is considered as chemical dosimetry. The Fricke system is possibly the oldest and the most reliable chemical dosimeter. The FBX system can be a very versatile and cost effective dosimetry system in radiotherapy. In radiotherapy, the aim is to deliver a known radiation dose with accuracy to a target volume in a patient and spare the surrounding normal tissues, in order to eliminate the cancer cells with least side effects of radiation.
