Monte Carlo-derived TLD cross-calibration factors for treatment verification and measurement of skin dose in accelerated partial breast irradiation.
Monte Carlo simulation was employed to calculate the response of TLD-100 chips under irradiation conditions such as those found during accelerated partial breast irradiation with the MammoSite radiation therapy system. The absorbed dose versus radius in the last 0.5 cm of the treated volume was also calculated, employing a resolution of 20 microm, and a function that fits the observed data was determined. Several clinically relevant irradiation conditions were simulated for different combinations of balloon size, balloon-to-surface distance and contents of the contrast solution used to fill the balloon. The thermoluminescent dosemeter (TLD) cross-calibration factors were derived assuming that the calibration of the dosemeters was carried out using a Cobalt 60 beam, and in such a way that they provide a set of parameters that reproduce the function that describes the behavior of the absorbed dose versus radius curve. Such factors may also prove to be useful for those standardized laboratories that provide postal dosimetry services.
Garnica-Garza
H M
HM
Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional Unidad Monterrey, Vía del Conocimiento 201 Parque de Investigación e Innovación Tecnológica, Apodaca NL C.P. 66600, Mexico. hgarnica@cinvestav.mx
D001940:Breast / Q000528:radiation effects*; D002138:Calibration; D003037:Cobalt Radioisotopes; D049449:Luminescence; D008954:Models, Biological; D009010:Monte Carlo Method; D011829:Radiation Dosage; D011880:Radiotherapy Planning, Computer-Assisted / Q000379:methods*; D012867:Skin / Q000528:radiation effects*; D012984:Software; D013499:Surface Properties; D013696:Temperature; D035501:Uncertainty
D003037:Cobalt Radioisotopes