LI Qiankun, FU Yuchuan. Dosimetry perturbation in inhomogeneous phantoms with small beamlets of 60Co γ-rays and 6–MV photon beams[J]. Journal of Radiation Research and Radiation Processing, 2007,25(1):28-32.
LI Qiankun, FU Yuchuan. Dosimetry perturbation in inhomogeneous phantoms with small beamlets of 60Co γ-rays and 6–MV photon beams[J]. Journal of Radiation Research and Radiation Processing, 2007,25(1):28-32.DOI:
Dosimetry distribution in central axis of inhomogeneous phantoms with small field size beams (beamlets) of ,60,Co γ-rays and 6–MV X rays were simulated with Monte Carlo code system EGSnrc. The dose enhancement effects and decreasing effects caused by material inhomogeneity were studied dose perturbation factor (DPF), a parameter defined as the ratio of the dose at a point in a heterogeneous phantom to the dose of the same spatial location point in a homogeneous phantom. The results showed that the degrees of the dose enhancement or decreasing depended on energy of the radiation, field sizes of the beamlets and sizes of the phantoms. And this kind of dosimetry change was not linear.