Abstract
The conversion process of the 392 keV γ-transition of 113 m In has been reinvestigated using two accurate counting methods. The emission rate of conversion electrons has been measured with a 4 πe- X coincidence method using a proportional gas flow counter together with two NaI(Tl) crystals or a Si(Li) detector. The emission rate of the K-shell conversion electrons was determined with a magnetic ß-spectrometer and a high resolution Si(Li) detector in an electron X-ray coincidence arrangement. The γ-ray emission rate of all sources was determined with a calibrated NaI(Tl) γ-ray spectrometer. From these measurements the total internal conversion coefficient, α, that for the K-shell, α K , and the conversion ratio R = K/( L+ M+…) have been deduced. A second less accurate value for the ratio R has been taken from recorded electron spectra. The results obtained from the measurements with 12 different sources are:: α = 0 0·540 ± 0·007, α K = 0·437 ± 0·007, and R = 4·24 ± 0·07. The errors stated are discussed in some detail. The half-life of the isomeric state 113 m In has been determined with a proportional gas flow counter (electrons) and two different NaI(Tl) crystals (γ-rays). The result obtained from measurements with 12 sources is T 1 2 = (99.47 ± 0.07) min .
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