Video of the first Flash irradiation in an IBA clinical compact gantry treatment room at the Rutherford Cancer Centre Thames Valley in UK. This achievement represents a major milestone towards bringing Flash irradiation in a compact setup together with our medical and research partners to clinical treatment. Flash radiotherapy is a novel external non-invasive radiotherapy technique that consists of delivering a high dose of radiation at an ultra-high dose rate. When compared to radiotherapy delivered at conventional dose rates (1 – 7 cGy/sec), the Flash phenomenon seems to appear when irradiation is delivered seems to appear when irradiation is delivered with a dose superior to 8 Gy and at a dose rate above 40 Gy/sec in a very short time (less than a second).

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