Tests with different kind of k Vp-meters in standard X-rays beams used for instruments calibration, in diagnostic radiology level

In this work, tests were carried out in one X-ray system, Medicor Moevek Roentgengyara, Model Neo-Diagnomax, (single-phase, full wave rectified) that operate in the range from 40 kV to 100 kV, and fixed 6 mA in the fluoroscopic mode, with total filtration of 2.5 mmAl. It was used as reference system an invasive system from Radcal, model Dynalyzer III (trade mark). The equipment tested were three non-invasive instruments, one PTW,model Diavolt (trade mark), and two Victoreen, model NERO (trade mark). It was performed measurements with those equipment, in the range from 50 kV to 100 kV, in steps of 10 kV and current of 6 mA (fixed). The quantity measured was kVpmax. The results showed the maximum variation of 3 % for one NERO (trade mark) and 1 % for the other equipment of the same type, and 0,3 % for Diavolt (trade mark) related to the invasive reference measurement system. The differences in the obtained values could be caused by the different kind of equipment used in that, their manufacturer calibration and aged. (author)