title: [Comparison of the measurement of absorbed doses by ferrous sulfate dosimetry and by ionization chambers].
abstract: A comparison has been carried out among six radiotherapy centres in Canada to determine the absorbed dose by means of ferrous sulphate dosemeters and ionization chambers. Previous to these measurements, epsilon was found to be 2196+/-7 dm3 mol-1 cm-1. The results show that: for 60Co at four centres, two are better than 1% and the other two differ by 2 to 5%; for high energy electrons at four centres, one is better than 1%, another differs by 1 to 3% and the last two differ by more than 3% (the maximum discrepancies are +7% and -6%); for high energy photons at five centres, two are equal to 1%, two others differ by 2 to 4% and the last one differs by + 12%. The chemical dosemeter with irradiation cells made of quartz appeared to be an excellent dosemeter for this type of comparison. The standard error of the means was about 0.3%.
mesh_terms: D005296:Ferrous Compounds / Q000528:radiation effects; D007501:Iron; D008961:Models, Structural; D011829:Radiation Dosage; D013053:Spectrophotometry; D013431:Sulfates / Q000528:radiation effects
chemical_list: D005296:Ferrous Compounds; D013431:Sulfates; D007501:Iron
vernacular_title: Résultats d'une comparison pour la mesure de la dose aborbée au moyen du dosimètre de sulfate ferreux et de chambre d'ionisation