Kβ/Kα X‐ray transition‐probabilitiy ratios for 8 elements in the range 69 ⩽ Z ⩽ 76 were measured with an Ultra‐LEGe solid state detector with a resolution of 150 eV at 5.9 keV. The characteristic K X‐rays were produced by a 25 mCi 57Co annular source. Experimental results have been compared with theoretically calculated values and other available experimental results.

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