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. 2019 Mar 28;20(4):29–44. doi: 10.1002/acm2.12556

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© 2019 The Authors. Journal of Applied Clinical Medical Physics published by Wiley Periodicals, Inc. on behalf of American Association of Physicists in Medicine.

This is an open access article under the terms of the http://creativecommons.org/licenses/by/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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(a) The Sphinx device is shown with the fiducial insert for x‐ray vs proton beam coincidence. (a‐c) The RW3 blocks with wedges (W1, W2, W3, and W4) are shown in frontal (a), back (b), and side (c) views. The W1, W2, W3, and W4 are used to measure the ranges, width, and distal‐fall‐off of energies 106, 145, 172, and 221 MeV, respectively. (d) The RW3 block is shown with the cutout for the PPC05 parallel plate chamber as well as the 3 cm thickness buildup that is placed in front of the chamber.