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Production

1. The Power of the Flux: Fission Reactors (Neutrons)

Fission reactors remain the global standard for large-scale, bulk production of radioisotopes. Their primary strength lies in an extremely high neutron flux, often reaching 10¹³–10¹⁵ n/cm²/s at facilities like Australia's Nuclear Science and Technology Organisation (ANSTO).

Because neutrons carry no electrical charge, they easily penetrate atomic nuclei to drive "Neutron Capture" (n,γ) and uranium fission reactions, a scale of production that accelerators generally cannot match.

Ideal Applications:

  • Bulk Fission Products: Massive yields of parent isotopes like Molybdenum-99.

  • Neutron Capture: Creating isotopes like Iodine-131 and Cobalt-60.

  • Industrial Scale: Very large batch production for global supply chains.
     

Examples:

  • Molybdenum-99 → parent of Tc-99m

  • Iodine-131

  • Lutetium-177 (reactor route)

  • Cobalt-60

Image by Antonio Vivace
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2. The Precision Pathway: Electron Accelerators (Photons)

Electron Accelerators  represent the "surgical" approach to nuclear production. By firing high-power electron beams at a converter, which generates high-energy Bremsstrahlung photons.

These photons drive precise photonuclear reactions (γ,p) and (γ,n), which are perfect for creating ultra-pure isotopes where traditional neutron methods might produce unwanted contaminants.
 

The SCMR Advantage:
 

  • Uranium-Free: Eliminates the need for uranium handling and nuclear fission waste.
     

  • High Specific Activity: Produces "clean" isotopes like Copper-67 without the messy chemical impurities found in reactors.
     

  • Specialty Production: The primary route for our flagship isotope, Actinium-225.
     

Core Reactions that make linear accelerators Ideal:
 

  • Actinium-225: Ra226(γ,n) → Ra225 → Ac225 (the specialty zone).
     

  • Copper-67: Zn68(γ,p) route; avoids reactor co-production of Cu-64 contamination.

3. The PET Backbone: Cyclotrons (Protons)

Cyclotrons are the masters of Charged Particle Reactions. By accelerating protons or alpha particles in a spiral path, they can induce reactions like (p,n), (p,2n), or (p,α).

These machines are the workhorses of hospital-based nuclear medicine, specialising in light-to-medium mass isotopes used in Positron Emission Tomography (PET) and diagnostic tracers.
 

Why Cyclotrons Dominate:
 

  • Tunable Energy: Protons can be precisely tuned to trigger specific reactions, resulting in high specific activity.
     

  • On-Site Supply: Their relatively compact scale allows for installation in or near major hospitals to provide short-lived tracers.
     

  • Precision Tracers: Essential for PET imaging, the backbone of modern cancer diagnosis.
     

Key Examples:

  • F-18 (The gold standard for PET scans).

  • Ga-68 (accelerator production alternative to generators).

  • Zr-89 (common PET isotope).

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The main cyclotron at TRIUMF in Vancouver.
Image courtesy of TRIUMF

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4. Strategic Insight: Choosing the Right Tool

At SCMR, our strategy is built on choosing the right driver for the right clinical need. While reactors dominate bulk, low-cost isotopes, and cyclotrons provide hospital-scale diagnostics, SCMR’s focus on electron accelerator technology targets the high-value, high-purity therapeutic market.

The Overlap: Some isotopes, like Copper-64, can be produced by all three systems, but the choice of machine determines the final purity and cost-efficiency.​​

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