The study of characteristic of optically stimulated luminescence NanoDot dosimeter for 6 megavoltage x-ray energy in radiotherapy
Keywords:
radiation dosimeter, OSL, NanoDot, radiotherapyAbstract
Background: Radiation therapy uses high energy photon beams to damage cancer cell. Dose verification is an important step to ensure that dose delivered to patient is accurate. Optically stimulated luminescence dosimeters (OSL) NanoDot has been used for beam dosimetry. The study of dosimetric characteristic of OSL NanoDot is necessary before using it for clinical practice.
Objective: To evaluate the performance of the OSL NanoDot for 6 MV photon beams.
Materials and Methods: Measurements were carried out with OSL nanoDot (Landauer Inc., Glenwood, IL, USA) using 6 MV photon beam to evaluate the dosimetric characteristic such as fading characteristics, reproducibility, signal depletion per read out, angular dependence, dose linearity, dose rate dependence and source to surface distance dependence. Measurements were performed with source axis distance (SAD) and source to surface distance (SSD) technique. The experimental set-up and dose parameter were according to the clinical practice. After irradiation, induvial OSL NanoDots were read out and repeated at least five times and the values were averaged.
Results: The fading result of NanoDot showed more than 15% signal loss after irradiation then. The signal is stable after five minutes after irradiation. The reproducibility ± 2.5% and signal depletion per read out 0.05% signal per read out. The detector exhibited linearity with the R2 of 0.9991. The angular dependency when the beam was irradiated perpendicular to the detector. NanoDot is independence with dose rate. However, the signal was decreased when increased the source to surface distance.
Conclusions: The detector properties must be studied by the user before apply in dose verification for accurate determination of the entire dose on the patient. The investigation possible lead to excellent treatment quality and prevention of any dose errors.
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