*Indium 111 decays to stable Cd-111 by isobaric decay.* (1)

 

In-111 decays through three separate stages:

Stage 1: It transitions from Indium-111 and emits 416 keV turning into Cd-111 in its excited state.  This happens by electron capture wherein X-rays are emitted 71.7% of the time, and the other 28.3% is accounted for by internal conversion electrons and Auger electrons, which cannot be detected by the photon probe. (1)

Stage 2: It then transitions from 416 keV to 245 keV, and 90.6% of the time 171 keV gamma rays are emitted.  In the other 9.4%, X-rays usually follow, but in some cases instead of X-rays, internal conversion electrons and Auger electrons are emitted.  (1)

Stage 3: It then transitions from 245 keV to the ground state in which 94.1% of the time 245 keV gamma rays are emitted. The other 5.9% is usually followed by X-rays, but in some cases instead of X-rays, internal conversion electrons and Auger electrons, which cannot be detected by the photon probe, are emitted. (1)

 

In each decay, 171 keV gamma rays are emitted 90.6% of the time, and 245 keV gamma rays are emitted 94.1% of the time. Since both instances have a high probability rating, the In-111 will never decay directly to the ground state. (1)