A CaS:Ce,Sm-based dosimeter for online dosimetry measurement
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A film dosimeter based on optically stimulated luminescence (OSL) material of CaS:Ce,Sm was developed for online irradiation dosimetry measurement. The stimulation is provided by a laser with a wavelength of 980 nm, and the OSL luminescenceis collected by a photodiode. Using (60)Co gamma-rays, we investigated the dosimetry characteristic of the dosimeter at different dose rates and total doses. The real-time detection results showed that the OSL signals versus total ionizing dose exhibited a good linearity in a dose range of 0.1-185 Gy.Keywords:
Optically stimulated luminescence
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Purpose: Evaluation of the optically stimulated luminescence (OSL) system for surface dose measurement for breast radiation therapy techniques. Methods: Landauer InLight OSL were calibrated on a Varian 21EX linac using an ion chamber with 6 MV beam. The response of OSL, TLD and a parallel plate chamber were compared at the surface of a solid water phantom and also under reference conditions (10×10cm2 at depth 5cm). OSL angular dependence, reproducibility, linearity, and inter‐OSL variability were investigated. Radiation therapy treatment plans were generated for an anthropomorphic breast phantom (RANDO). Eleven locations were identified and 2 OSL and 3 TLD were placed at each location. Treatment was delivered under clinical conditions. The OSL and TLD were evaluated for dose response. Results: The average response of the OSL to dose as compared to the ion chamber was found to be within 6% under reference conditions and the TLD within 2.5%. The factor of surface response to response at depth was found to be 0.284 for the Markus chamber, 0.425 for the OSLˈs and 0.434 for the TLD. No angular dependence was found for the OSL. The reproducibility of the batch response given 100 cGy was within 1%. The linearity of the OSL displayed an R2 value of 0.9997. The OSL given 100 cGy under reference conditions had a maximum deviation from average of 2.6%. Discrepancies on the IMRT plan between TLD and OSL ranged from 0.1% to 6.5% for the dose>50cGy and between 3.5% and 38.9% for the dose≤50cGy Conclusions: OSL and TLD are over‐responding to surface dose with respect to the parallel plate ion chamber. OSL have been found to respond similarly to TLD at the surface of an anthropomorphic phantom.
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Optically stimulated luminescence (OSL) dosimetry characteristics of topaz glass composites were studied. The purpose of this research was to find the suitability of topaz glass composites as a dosimeter using the optically stimulated luminescence technique. The pellets of topaz glass from Sabser mine, Skardu, Pakistan, were prepared with dimensions of 6.0 mm diameter and thickness of 1.0 mm, and they were sintered at 900 °C. Gamma, X-rays and beta doses were given to pellets from 60 Co/ 137 Cs, X-ray equipment (16.2 and 41.0 keV) and 90 Sr/ 90 Y source respectively. The OSL decay curve revealed to be exponential with a rapid decay of signal within 10 s, presenting then a non-zero long tail. There is also an exponential decay for various absorbed doses in case of beta radiation. The integrated area of OSL signal versus absorbed dose showed a linear behavior from 100 mGy to 5 Gy for gamma and X-rays. This area after irradiation with effective energies of 16.2 keV is 1.6, 3.2 and 3.3 times higher as compared to X-rays (41.0 keV), 60 Co and 137 Cs respectively. There was no significant variation in the integrated area of signal above 0.66 MeV. A maximum variation in integrated area of OSL signal of about ± 9% was observed after ten cycles of consecutive OSL measurements. The pellets remained mechanically stable during handling in all types of experiments. Topaz glass composites can be used as dosimeters by employing the OSL dosimetry technique.
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A commercial optically stimulated luminescence (OSL) system developed for radiation protection dosimetry by Landauer, Inc., the InLight™ microStar reader, was tested for dosimetry procedures in radiotherapy. The system uses carbon‐doped aluminum oxide, , as a radiation detector material. Using this OSL system, a percent depth dose curve for gamma radiation was measured in solid water. Field size and SSD dependences of the detector response were also evaluated. The dose response relationship was investigated between 25 and 400 cGy. The decay of the response with time following irradiation and the energy dependence of the OSL detectors were also measured. The results obtained using OSL dosimeters show good agreement with ionization chamber and diode measurements carried out under the same conditions. Reproducibility studies show that the response of the OSL system to repeated exposures is (1sd), indicating a real possibility of applying the Landauer OSL commercial system for radiotherapy dosimetric procedures.
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Journal Article Technical performance of the Luxel Al2O3:C optically stimulated luminescence dosemeter element at radiation oncology and nuclear accident dose levels Get access Steven D. Miller, Steven D. Miller *Corresponding author: steven.miller@pnl.gov Search for other works by this author on: Oxford Academic PubMed Google Scholar Mark K. Murphy Mark K. Murphy Search for other works by this author on: Oxford Academic PubMed Google Scholar Radiation Protection Dosimetry, Volume 123, Issue 4, March 2007, Pages 435–442, https://doi.org/10.1093/rpd/ncl500 Published: 12 December 2006 Article history Received: 19 May 2006 Revision received: 23 October 2006 Accepted: 02 November 2006 Published: 12 December 2006
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Optically Stimulated Luminescence (hereafter OSL) dosimeter system is the method for radiation dose measurements by detecting light emitted when the luminescence material, which is exposed to radiation, is stimulated with visible light. Recently, this system has been developed as an advanced method for personal radiation dosimetry and has already been adopted in some countries such as U.S.A., Canada and others. Some basic characteristics (linearity for dose, energy response, angular dependence, dose evaluation performance on mixed irradiation field, fading and so on) required for the practical application of the {alpha}-Al{sub 2}O{sub 3} OSL dosimeter were investigated. It is shown that the OSL dosimeter has excellent good enough to performance for the measurement of {gamma}, X and {beta} doses and is good enough for practical use as personal dosimeter. This paper describes the basic characteristics of the OSL dosimeter obtained by the investigation. (author)
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Abstract Background Optically stimulated luminescence dosimeters (OSLDs) have a number of advantages in radiation dosimetry making them an excellent dosimeter for in vivo dosimetry. The study aimed to study the dosimetric characteristics of a commercial optically stimulated luminescence (OSL) system by Landauer Inc., before using it for routine clinical practice for in vivo dosimetry in radiotherapy. Further, this study also aimed to investigate the cause of variability found in the literature in a few dosimetric parameters of carbon-doped aluminium oxide (Al 2 O 3 :C). Materials and methods The commercial OSLD system uses Al 2 O 3 :C nanoDot TM as an active radiation detector and InLight TM microStar ® as a readout assembly. Inter-detector response, energy, dose rate, field size and depth dependency of the detector response were evaluated for all available clinical range of photon beam energies in radiotherapy. Results Inter-detector variation in OSLD response was found within 3·44%. After single light exposure for the OSL readout, detector reading decreased by 0·29% per reading. The dose linearity was investigated between dose range 50–400 cGy. The dose response curve was found to be linear until 250 cGy, after this dose, the dose response curve was found to be supra-linear in nature. OSLD response was found to be energy independent for Co 60 to 10 MV photon energies. Conclusions The cause of variability found in the literature for some dosimetric characteristics of Al 2 O 3 :C is due to the difference in general geometry, construction of dosimeter, geometric condition of irradiation, phantom material and geometry, beam energy. In addition, the irradiation history of detector used and difference in readout methodologies had varying degree of uncertainties in measurements. However, the large surface area of the detector placed in the phantom with sufficient build-up and backscatter irradiated perpendicularly to incident radiation in Co 60 beam is a good method of choice for the calibration of a dosimeter. Understanding the OSLD response with all dosimetric parameters may help us in estimation of accurate dose delivered to patient during radiotherapy treatment.
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