Assessment of Temporary Radioactivation for Tissue Expanders in Breast Radiation Therapy: Preliminary Study

Background: As breast tissue expanders consist of metallic materials in the needle guard and ferromagnetic injection port, irradiation can produce radioactivation.Materials Methods: A CPX4 (Mentor Worldwide LLD) expander was exposed using Versa HD (Elekta) linear accelerator. Two photon energies 6 10 MV-flattening filter free (FFF) beams with 5,000 monitor units (MU) were irradiated to identify types radiation. Furthermore, 300 MU MV-FFF beam by varying machine dose rates (MDRs) 600, 1,200, 2,200 MU/ min. To assess instantaneous (IDRs) solely from CPX4, a placed outside treatment room after irradiation, portable radioisotope identification device used radiation measure IDR.Results Discussion: After delivery expander, energy spectrum whose peak 511 keV found MV-FFF, while there no resultant one MV-FFF. The time each measurement 1 minute, mean IDRs 0.407, 0.231, 0.180 μSv/hr for three successive measurements. Following indicated around background level first regardless MDRs.Conclusion: institute entry protocol varies according working hours occupational doses, we suggest an addition minute institutes’ own patients case radiotherapy vaults equipped maximum MV beams.