Abstract
An experimental investigation of the influence of superconductivity on the decay rate of99mTc,λT, has been performed by means of a differential method. The99mTc samples containing99Tc as a carrier were prepared by electrodeposition on a copper plated tungsten wire. For production of metallic technetium the samples were reduced in pure hydrogen gas at 800~1000°C. X-ray analysis of the samples showed they were surely metallic with anhcp structure. The lattice constants observed area=2.741 A andc=4.398 A. The transition temperature was found to be 7.5±0.2K. Comparison of two sources, normal (room temperature) and superconducting (4.2 K), did not show an appreciable effect of superconductivity on the decay rate of99mTc exceeding the limit of uncertainty of our experiment:Δλ/λT=(1.1±2.7) × 10−4.
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