Actinium-225
Why Actinium-225?
Actinium-225 is the cornerstone of the next generation of oncology.
As the primary radioisotope for Targeted Alpha Therapy (TAT), it represents one of the most powerful tools available for treating metastatic and treatment-resistant cancers.
While global clinical demand is surging, current production is severely limited, creating a critical need for a reliable, commercial-scale supplier like Southern Cross Medical Radioisotopes (SCMR).
Technical Snapshot
Isotope: Actinium-225 (Ac-225)
Decay Mode: Alpha emission
Half-life: 10 days
Key Reaction: Ra226(γ,n) → Ra225 → Ac225
Primary Use: Targeted Alpha Therapy (TAT) for prostate, brain, and neuroendocrine cancers.
How it Works: The Alpha Advantage
Actinium-225 is prized for its ability to emit high-energy alpha particles. Unlike traditional radiation, these particles have a very short path length (only a few cell diameters), allowing them to deliver a lethal dose of radiation directly to tumour cells with extreme precision.
This "molecular scalpel" effect ensures maximum tumour destruction while effectively sparing the surrounding healthy tissue
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The Production Pathway
SCMR will utilise high-energy electron accelerators to produce Ac-225, a method that offers significant advantages over legacy nuclear reactor routes:
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Uranium-Free: Our process avoids uranium fission, significantly reducing regulatory and proliferation burdens.
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Scalability: High-energy accelerators enable scalable photonuclear reactions, providing the only proven pathway for commercial medical-scale supply.
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Sustainability: Our modern, distributed production model will minimise long-range transport and reduce environmental waste.
Securing the Supply Chain
A secure supply of Ac-225 begins with its target material: radium-226 (Ra-226). SCMR will establish a vertically integrated pipeline by producing Ra-226 directly from uranium ore (pitchblende) and other sources. By controlling this critical upstream resource, we ensure that our production of Ac-225 remains secure, sustainable, and regionally controlled.