TY - JOUR
T1 - Application of Al2O3
T2 - C+fibre dosimeters for 290 MeV/n carbon therapeutic beam dosimetry
AU - Nascimento, L. F.
AU - Vanhavere, F.
AU - Kodaira, S.
AU - Kitamura, H.
AU - Verellen, D.
AU - De Deene, Y.
PY - 2015/10/1
Y1 - 2015/10/1
N2 - The capability of radioluminescence (RL) dosimeters composed of carbon-doped aluminium oxide (Al2O3:C) detectors+optical fibre has been verified for absorbed dose-rate measurements during carbon radiotherapy. The RL signals from two separate Al2O3:C detectors (single crystal 'CG' and droplet 'P1') have been systematically measured and compared along the Bragg-curve and Spread-Out Bragg-Peak of 290MeV/n carbon beams in the water. The absorbed dose response was assessed for the range of 0.5-10Gy. For doses up to 6Gy, we observed a linear response for both types of detectors, while for higher doses CG presented a more prominent supraliearity than P1. The RL response for low-LET protons in the entrance from the curve was found to closely resemble that observed for a clinical 6MV X-ray beam, while it was found that P1 has a better agreement with the reference data from standard ionization chamber than CG. We observed a significant decrease in luminescence efficiency with LET in the Bragg peak region. The Al2O3:C RL luminescence efficiency differs from Al2O3:C OSL results, which implies that the signal can be corrected for LET dependency to match the correct SOBP and Bragg Peak.
AB - The capability of radioluminescence (RL) dosimeters composed of carbon-doped aluminium oxide (Al2O3:C) detectors+optical fibre has been verified for absorbed dose-rate measurements during carbon radiotherapy. The RL signals from two separate Al2O3:C detectors (single crystal 'CG' and droplet 'P1') have been systematically measured and compared along the Bragg-curve and Spread-Out Bragg-Peak of 290MeV/n carbon beams in the water. The absorbed dose response was assessed for the range of 0.5-10Gy. For doses up to 6Gy, we observed a linear response for both types of detectors, while for higher doses CG presented a more prominent supraliearity than P1. The RL response for low-LET protons in the entrance from the curve was found to closely resemble that observed for a clinical 6MV X-ray beam, while it was found that P1 has a better agreement with the reference data from standard ionization chamber than CG. We observed a significant decrease in luminescence efficiency with LET in the Bragg peak region. The Al2O3:C RL luminescence efficiency differs from Al2O3:C OSL results, which implies that the signal can be corrected for LET dependency to match the correct SOBP and Bragg Peak.
UR - http://www.scopus.com/inward/record.url?scp=84934958878&partnerID=8YFLogxK
U2 - 10.1016/j.radphyschem.2015.06.001
DO - 10.1016/j.radphyschem.2015.06.001
M3 - Article
AN - SCOPUS:84934958878
SN - 0969-806X
VL - 115
SP - 75
EP - 80
JO - Radiation Physics and Chemistry
JF - Radiation Physics and Chemistry
ER -