A method was devised to measure bremsstrahl ung spectra from commercial X-ray t ubes on an a bsolute scale, using a thallium-a ctivated sodium-iodide cr ystal-scint illation spectrometer. The method was used to study bremsstrahlung spect ra between 20-and 100-kilovolt s exciting potentials from a b eryllium window tube having a t hick t ungsten t arget. Fully correct.ed, absolute experimental spectra were obtained a t exciting potentials of 50 and 100 kilovolt s.
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Margarete Ehrlich (1955) studied this question.