Abstract
The 0.87 keV K electron capture peak of 22Na has been observed using an internal source, scintillation counter technique. Direct measurement of the K/ beta + ratio was therefore possible: the result obtained was K/ beta +=0.105+or-0.009. A review is given of recent precise results of the total capture to positron ratio (e/ beta +) in 22Na and the interpretation of these experiments is discussed. In conclusion, it is shown that the correction for electron exchange and overlap effects to the K/ beta + ratio has a smaller effect than has been supposed for low atomic numbers and that it is impossible to deduce an estimate for the Fierz interference term b from K/ beta + or e/ beta + measurements on light isotopes.
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