Separation of scintillation and Cerenkov radiation in fiber optic dosimeters
Abstract
A plastic scintillating fiber dosimeter has been developed that applies a novel temporal method to separate scintillation and Cerenkov radiation produced by pulsed external beam radiation therapy sources. Current single probe methods in megavoltage scintillation dosimetry apply optical filters that allow for characterisation of the Cerenkov radiation signal generated in irradiated optical fibers. These methods utilise an optical fiber with a split junction, allowing for simultaneous measurements of the single optical signal passed through different optical filters with separate photodetectors. Cross calibration of the two photodetectors responses is required; the accuracy of the method is dependent upon the calibration conditions being similar to those where the measurements are made. Cases where measurement conditions dont match calibration conditions include in vivo dosimetry and in vitro treatment planning dosimetry. The dosimetry system developed eliminates the requirement for optical filters and multiple photodetectors in single probe scintillation dosimetry provided the radiation source is pulsed. Water equivalence is a desired property for dosimeters as it allows for a simplified calculation of dose absorbed by water compared to that of water inequivalent dosimeters. The scintillator employed in the dosimetry system is required to have a long decay constant, however the scintillator implemented for its long decay constant, BC444 (Saint Gobain), was not known to be…
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