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    Öğe
    Comparisons of various water-equivalent materials with water phantom using the Geant4/GATE simulation program
    (Ijrr-Iranian Journal Radiation Res, 2022) Sahmaran, T.; Kaskas, A.
    Background: The aim of this study was to compare the dosimetric properties of various water-equivalent phantom materials, such as solid water WT1 (WT1), solid water RMI457 (RMI457), plastic water, virtual water, polymethyl methacrylate (PMMA), polystyrene and A150, with water phantom. Materials and Methods: Percentage depth dose values were obtained with IBA Blue Phantom2 and solid water phantom (RW3) used in clinical radiotherapy. The measurements were carried out at 6 and 18 MV photon energies with a field size of 10 x 10 cm(2) and source-skin distance (SSD) at 100 cm. Simulations for the commercial solid phantoms were performed under these same conditions using Geant4 Application for Tomographic Emission (Geant4/GATE) simulation code. Results: PMMA (3.66 & PLUSMN;1.43) % and A150 (2.40 & PLUSMN;2.20)% phantom materials were determined to have a low rate of water equivalence at 6 MV photon energy while WT1 (-2.80 +/- 2.17)% and plastic water (-2.04 +/- 2.13)% phantom materials showed a low rate of water equivalence at 18 MV photon energy. Solid water WT1 (0.13 +/- 1.11)% and RMI457 (-0.29 +/- 0.91)% phantom materials were seen to be good water-equivalent materials at 6 MV photon energy, while PMMA (-0.08 +/- 1.39)% and A150 (-1.08 +/- 1.53)% were the closest equivalent materials to water at 18 MV photon energy. Conclusion: All the materials examined in this study were found to be suitable for the daily dosimetric measurements in clinical applications. The most appropriate choice would seem to be to use water phantom for the dosimetric measurements in radiotherapy clinics depending on the possibilities and time.
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    Öğe
    AN EVALUATION OF THE OCCUPATIONAL EXTERNAL RADIATION EXPOSURE OF PERSONNEL IN NUCLEAR MEDICINE PRACTICES (2010-2020)
    (Oxford Univ Press, 2022) Sahmaran, T.; Atilgan, H., I; Nur, S.; Sahutoglu, G.; Yalcin, H.
    The aim of this study was to examine the radiation doses received by personnel working in the Nuclear Medicine Department between 2010 and 2020. The data obtained were compared with the dosages recommended by international authorities. The UNSCEAR 2008 report stated that the worldwide annual average effective dose to which personnel were exposed when monitored between 2000 and 2002 was 0.70 and 1.40 mSv, respectively. In this report, 0.7 mSv refers to the dose of all monitored personnel, and 1.4 mSv refers to the dose above the detection limit. In this study, the annual average effective dose value for personnel exposed to radiation was calculated as 1.65 mSv. This value represents the dose above the detection limit. Although the individual dose results are below the recommended annual dose limit, it should not be forgotten that more effort should be made to reduce radiation doses using the as low as reasonable achievable principles.