Research Article: Radiation protection considerations for ultra-high dose rate proton beam FLASH research: consensus from multi-institutional experience
Abstract:
The use of ultra-high dose rate (UHDR) radiation for radiotherapy could potentially improve outcomes for cancer patients by increasing healthy tissue sparing, known as the FLASH effect. As UHDR use expands in FLASH research and clinical translation, reassessing existing radiation safety programs is essential to determine whether UHDR beams introduce any new radiation safety requirements. This manuscript outlines the lessons learnt through investigations performed by members of the Varian FLASH forward consortium radiation protection working group. The information contained within is the consensus of the working group, as agreed, through discussions and reports during the monthly meetings. The paper brings together multi-institutional radiation protection experience from five Varian ProBeam type facilities engaged in preclinical and clinical proton FLASH research. Three main aspects of radiation protection are considered: shielding, activation, and accident scenarios. Lessons learned from the collective experience gained are presented to benefit those embarking on new proton FLASH research programs.
Introduction:
An increase in healthy tissue sparing, the so-called FLASH effect, has been observed when a large (?8 Gy) therapeutic radiation dose is delivered at an ultra-high dose rate (UHDR) of >40 Gy/s, compared to conventional radiotherapy (RT) dose rates of the order of 2 Gy/min ( 1 ). Due to the unique capability of cyclotron-based clinical proton beam therapy (PBT) systems to deliver doses at UHDR, much of the research effort into FLASH RT is performed in clinical PBT facilities. In order to achieve UHDR, proton…
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