Abstract:Objective Through monitoring the main parameters of dose output to evaluate the stability of domestic accelerator
XHA1400. Methods The Daily QA3 device was used to detect XHA1400 accelerator, including central axis dose (Dose), field
symmetry (Axsym,Trsym), field flatness (QAFlat), field energy (X-Energy, e-Energy), field size (XSize,YSize), and field shift
(XShift, YShift). The monitoring results of three consecutive months for accelerator by Daily QA3 were retrospectively analyzed,
and finally obtain the stability change trend and range of each parameter. Results The Daily QA3 device revealed that the Trsym and
X-Energy of 6 MV and 10 MV X-ray had a low stability performance, with deviation over 2%.The maximum deviations of stability
of the Trsym were: 2.61% (6 MV), 2.46% (10 MV), respectively. And the maximum deviations of stability of the X-Energy were:
4.86% (6 MV), 3.65% (10 MV). Other monitoring parameters of different energies showed a high stability performance. After the
replacement of ionization chamber, the monitoring of Daily QA3 revealed that the Trsym and X-Energy of 6,10 MV X-ray returning
to normal deviation. The energy of each grade and other detection parameters also fluctuated in a small range to maintain a high
stability. Conclusion Using Daily QA3 device to measure the accelerator XHA1400 can ensure the accuracy and stability. The
accelerator XHA1400 shows a high stability performance after the replacement of ionization chamber, which can meet the clinical
requirement.