An instrument for checking quality of therapeutic x-ray and electron radiation provides modes optimized for both electrons and for photons obtained by physically flipping the unit to interpose the necessary build-up material between the radiation beam and contained detectors. The invention provides an...http://www.google.com/patents/US7189975?utm_source=gb-gplus-sharePatent US7189975 - Wire-free, dual-mode calibration instrument for high energy therapeutic radiation
