The differential energy spectrum of the photons produced by 322-Mev electrons striking a 20-mil platinum target was measured by observing the energy of 3467 pairs produced in a one-mil thick lead foil in a Wilson cloud chamber in a magnetic field of 10,000 gauss. The spectrum is found to agree with that predicted by the Bethe-Heitler bremsstrahlung theory using a Thomas-Fermi model with suitable corrections for the thickness of the target. The energy of the 322-Mev electrons was determined by the spectrum of the photons observed in this experiment.
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Powell et al. (1951) studied this question.
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