[en] Analysis of percentage depth dose determination for 6 and 10 MV flattening filter free (FFF) photon beams at small fields using various types of detector. This paper describes the measurement of the percentage depth dose for 6 and 10 MV flattening filter free (FFF) photon beams produced from an Elekta Versa HD linear accelerator machine. Measurement were carried out using three types of detector, IBA Razor dioda, PTW PinPoint 3D and IBA CC13. The measurement were performed inside inside the Blue Phantom IBA supported with MyQA Accept software for beam scanning at the source to surface distance of 100 cm with field sizes of 1 x 1 cm², 2 x 2 cm², 3 x 3 cm² and 4 x 4 cm². Based on the data obtained, the measurement deviation between the IBA Razor detector and the PinPoint 3D detector shows a deviation range of 1.8 % - 2.1 %. It is different from the measurement deviation between the IBA CC13 detector and the PinPoint 3D detector which has a deviation range of 0.15 % - 0.21 %. So it can be concluded that the measurement using these three types of detectors shows that there is a match with the largest deviation smaller than 3.5 %. The PTW PinPoint 3D ion chamber, the IBA Razor Detector, and the IBA CC13 ion chamber can be used to make relative measurements to small fields up to 1 x 1 cm² of linear accelerators. (author)