A practical method for quantifying dose in bone and lung using TLDs when using 6 and 15 MV photon beams.

A practical method for quantifying dose in bone and lung using TLDs when using 6 and 15 MV photon beams.
Phys Med Biol. 2020 Feb 06;:
Authors: Sarıgül N, Surucu M, Reft CS, Malin M, Yeğingil Z, Ayadogan B
Abstract
This paper presents a practical method for converting dose measured with thermoluminescent dosimeters (TLD) to dose in lung and bone for 6 MV and 15 MV photon beams. Monte Carlo (MC) simulations and Burlin cavity theory calculations were performed to calculate fmediumTLD, the dose-to-TLD to dose-to-medium conversion factor. A practical method was proposed for converting TLD-measured-dose to dose-in-medium using the TLD dose calibration in water and fwatermedium, dose-to-medium to dose-to-water conversion factor. Theoretical calculations for fwatermediumwere performed using photon spectrum weighted parameters and were compared with MC simulations. Verification of the proposed method was done using phantoms having either bone or lung equivalent slabs stacked in between solid water slabs. Percent depth dose (PDD) curves were measured using 0.089 cm thick LiF:Mg,Ti (TLD-100) dosemeters placed at various depths within these phantoms. They were then corrected with fwatermediumfactors using the proposed dose conversion method, and were compared with the MC simulations. For 6 MV beam, the MC calculated fwatermediumfactors were 0.942 and 1.002 for bone and lung, and for 15 MV it was 0.927 and 1.005 for bone and lung, respectively...

Source: Physics in Medicine and Biology - February 5, 2020 Category: Physics Authors: Sarıgül N, Surucu M, Reft CS, Malin M, Yeğingil Z, Ayadogan B Tags: Phys Med Biol Source Type: research