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This determination was made using the electron capture decay of 54Mn. Two methods were employed to measure the K X-ray emission rate: by means of a pressurized 4re proportional counter with the gas at 1.5 MPa, and by means of a medium geometry-defined solid angle counter. The final result was 0~k = 0.2901_+ 0.003. Special care was taken in determining the corrections, some of which do not appear to have been allowed for so far. It is noteworthy that additional corrections, each about + 3 %, had to be applied to the results obtained with each of the two methods. Thus there remains complete agreement between them, but at a higher value of (ok than those appearing in recent publications.

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