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A vibrating reed electrometer with feedback amplifier has been used in conjunction with a differential ionization chamber to measure accurately the decay periods of several radioactive isotopes. This method proved to be simple, reliable, and free from uncertain corrections, with a low background due to the differential technique adopted and a low drift rate (normally less than 5 × 10−17 amp.) due to the feedback electrometer circuit. This high and easily varied sensitivity enabled the decay to be followed over 12 periods, making possible the detection of, and correction for, any weak long lived impurity activity, thus eliminating one major source of error in half life measurements. Least squares analysis of the data showed that a quadratic mean error as small as 1/2% can be easily achieved with this apparatus. Half life values were found as follows:[Formula: see text]
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Lorna M. Silver (1951) studied this question.
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