Abstract
A search for the non-unique once forbidden direct β-decay of 99m Tc to the 89.36 keV level in 99Ru has been carried out with Ge(Li) detectors and a curved crystal spectrometer. The γ-ray intensity ratio of the 89.36 keV transition in 99Ru to that of the 140.5 keV transition to the 99Tc ground state is equal to or less than 3.6 × 10 −4 for a 99Mo equilibrium source. Corrected for internal conversion and the percent 99Mo decay to the 142.6 keV isomeric level in 99Tc, the ratio of β-decay to the 89.36 keV level to γ-decay of 99m Tc is less than or equal to 8.7 × 10 −4. This limit is sufficiently small as to not seriously alter present local energy absorption dose calculations for 99m Tc administered to humans.
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