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Comparisons have been made between the dosimetry methods for 10-40 MeV electron-and X-radiation used at the radiation treatment centres in Essen and Villejuif by the respective resident staff and that used by a visiting group from the centre in UmeB. The absorbed doses from both electron-and X-radiation and the relative electron depth doses were measured using thimble ionization chambers. Electron isodose curves were derived from data obtained with photographic films. I n both comparisons, Essen-UmeB and Villejuif-UmeiL, the absorbed dose and relative electron depth dose data showed good agreement while the electron isodose curves showed significant discrepancies.