Physical Attributes:

In its natural original state, Indium is a shiny silver metal.  It is a very rare, soft metal that is commonly used for soldering two metals together, among many other things. (1)

 

Indium-111, originating from Indium, is a man- made isotope which is created when tiny particles are fired at the atoms with a proton accelerator making Indium into a radioactive isotope by changing the neutron to proton ratio. (1)

 

The half-life of Indium-111 is 2.8 days or 67.2 hours, and it decays by electron capture giving off photon energies of 171 keV and 245 keV. (2)

 

Indium only has two naturally occurring isotopes, and they are In-113 and In-115. (1)

Isotopes:

Isotope	Half-Life
In-113	Stable
In-113m	1.7 hours
In-114	1.2 minutes
In-114m	49.5 days
In-115	4.4E14 years
In-115m	4.5 hours
In-116	14.1 seconds
In-116m	54.2 minutes
In-117	44.0 minutes
In-117m	1.9 hours                      (3)