Abstract
A double ionization chamber for the differential method has been constructed, by which a minute difference in intensities (1 part in 105) of two γ-ray sources can be measured with the aid of a conventional sampling method. By the use of this chamber, the effect of superconductivity on the nuclear decay rate λ of 99mTc has been measured, but no effect was found within an experimental error Δλ/λ = (0.2±0.5) × 10−4. This result is consistent with our previous result, but is in essential disagreement with that of Byers and Stump. Another application of the device for determination of a long half-life is also demonstrated. The half-life of 60Co was determined in a 10 d measurement as T½ = (5.27±0.07)y, which is in excellent agreement with the current value.
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