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. 2024 Oct 24;14:25181. doi: 10.1038/s41598-024-73619-x

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© The Author(s) 2024

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Fig. 2 — (A) The depth LET_d curves in water from 127.4 MeV (blue) and 136.4 MeV (green) proton beams. At a depth of 11.14 cm, the LET_d was 3.4 keV/µm from the 127.4 MeV beam. At a depth of 11.53 cm, the LET_d from the 127.4-MeV beam was 11.4 keV/µm, and that from the 136.4-MeV beam was 1.52 keV/µm. (B) The target LET_d was 3.4 keV/µm for setups S1 (single 127.4 MeV at the depth of 11.14 cm in water) and S2 (mixed beams of 127.4 MeV and 137.4 MeV at the depth of 11.53 cm in water).