This is an observational study. This protocol will determine the feasibility of using a novel nano-material based fiber-optic dosimeter (nanoFOD) device, with dimensions less than 1 mm wide, to measure real-time, pin-point, in-vivo radiation dose given during external beam delivery of radiation therapy treatments.This new protocol is similiar in design to Pro00050297 with the significant difference being the monitoring will be performed during external baem radiotherapy.