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111Indium (111In) is a radioisotope of indium characterized by a half-life of 2.8 days and is used in nuclear medicine for imaging and therapy. It emits both gamma radiation and Auger electrons.

Production[edit | edit source]

111In is produced in a cyclotron by the proton irradiation of cadmium. The resulting 111mCd decays to 111In by electron capture.

Medical uses[edit | edit source]

111In is used in nuclear medicine for imaging and therapy. It is used in radiopharmaceuticals such as Octreoscan (111In-DTPA-octreotide) for imaging neuroendocrine tumors, and ProstaScint (111In-capromab pendetide) for imaging prostate cancer.

Decay[edit | edit source]

111In decays by electron capture to 111Cd with a half-life of 2.8 days. The decay is accompanied by the emission of gamma radiation with energies of 171 and 245 keV, and Auger electrons.

Safety[edit | edit source]

As with all radioisotopes, handling 111In requires precautions to avoid radiation exposure. These include the use of lead shielding and radiation monitoring devices.

See also[edit | edit source]

111In Resources
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Contributors: Prab R. Tumpati, MD