Back to matchesWe found a matchYour institution may have rights to this item. Sign in to continue.TitleAn empirical relationship for determining photon beam quality in TG-21 from a ratio of percent depth doses.AuthorsFollowill, David S.; Tailor, Ramesh C.; Tello, Victor M.; Hanson, William F.PublicationMedical Physics, 1998, Vol 25, Issue 7, p1202ISSN0094-2405Publication typeArticleDOI10.1118/1.598396