ESTRO 2024 - Abstract Book

S3322

Physics - Detectors, dose measurement and phantoms

ESTRO 2024

dose was 16.3 µSv, 11.5 µSv and 4.0 µSv for the same positions. All of the equivalent doses were under 25 µSv and 50 µSv for the full body and organs respectively (Figure 2c,d) which is well below the yearly recommended dose limit for the public at 1 mSv according to the ICRP. The estimated LAR for the parent at 1 m away from the child was 0.0024% while at 3 m (C) the LAR was 0.0006%. The neutrons comprised 90% of the equivalent dose. In addition, the neutron spectra had a slight increase in energy for the CSI patient, as could be expected for a higher energy beam (Figure 2a), Whereas no notable difference was observed the photon spectra across the two treatment cases (Figure 2b).

Conclusion:

The dose exposure to a potential parent located in the treatment room during modern pencil beam scanning PT is very low, and comparable to a transatlantic flight. The location of the parent influenced the dose exposure and could be considered in the potential scenario of allowing parents or caretakers in the treatment room.