Production Methods — Cyclotrons vs. Nuclear Reactors
Radiopharmaceuticals are produced through two primary methods in the UK. Nuclear reactors are used to create "neutron-rich" isotopes like Molybdenum-99, which is the precursor to Technetium-99m, the most widely used diagnostic isotope. Since the UK currently relies on overseas reactors for these raw materials, there are ongoing proposals, such as Project ARTHUR, to build domestic medical research reactors.
Alternatively, Cyclotrons (particle accelerators) are used to produce "proton-rich" isotopes like Fluorine-18, commonly used in PET scans. The UK has a robust domestic network of cyclotrons located in academic hubs and private manufacturing sites. These machines accelerate charged particles to high speeds and collide them with target materials to create the necessary radioactive atoms on-site or nearby.