Abstract
Efficiencies of various powder phosphors under x‐ray excitation are determined. Thin layers are used to minimize the loss in light output due to scattering and absorption of the emitted luminescence. The luminescence of the layer is measured with the aid of a calibrated photomultiplier. The absorbed x‐ray radiation is measured with a scintillation crystal. The efficiencies found are of the order of the cathode‐ray efficiencies; calcium tungstate has the largest deviation.
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