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A radioligand is a radioactive biochemical substance (a ligand, specifically) that is used to study the receptor systems of the body.

The radioligand is injected in the pertinent tissue and binds to its receptor. When the radioactive isotope in the ligand decays it can be measured, e.g., by positron emission tomography.

The transport of the radioligand is described by receptor kinetics.

[edit] Radioactive isotopes commonly used

• Tritium ³H
• Carbon-14
• Sulfur-35
• Iodine-131

[edit] List of radioligands

• (¹⁸ F)altanserin ^{[citation needed]}
• (¹¹ C)ketanserin ^{[citation needed]}

[edit] See also

• Binding potential
• Distribution volume