XR-RV3 radiochromic film response to a given air kerma shows dependence on beam quality and film orientation. The presence of backscatter slightly modifies the x-ray energy spectrum; however, the increase in film response can be attributed primarily to the increase in total photon fluence at the sensitive layer. Film calibration curves created under free-in-air conditions may be used to measure dose from fluoroscopic quality x-ray beams, including patient backscatter with an error less than the uncertainty of the calibration in most cases.

These results show that MAGIC-f gel is a promise for tridimensional dose distribution measurements.

Purpose: The purpose of this study was to provide guidance on quality management for electronic brachytherapy. Materials and Methods: The task group used the risk-assessment approach of Task Group 100 of the American Association of Physicists in Medicine. Because the quality management program for a device is intimately tied to the procedure in which it is used, the task group first designed quality interventions for intracavitary brachytherapy for both commercial electronic brachytherapy units in the setting of accelerated partial-breast irradiation. To demonstrate the methodology to extend an existing risk analysis for a different application, the task group modified the analysis for the case of post-hysterectomy, vaginal cuff irradiation for one of the devices. Results: The analysis illustrated how the TG-100 methodology can lead to interventions to reduce risks and improve quality for each unit and procedure addressed. Conclusion: This report provides a model to guide facilities establishing a quality management program for electronic brachytherapy.

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The resulting effect of the pointlike characteristics of the PDR brachytherapy source likely account for the differences observed between well chamber and in-air measurements.

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Purpose: To provide a dosimetric characterization of the Xoft Axxent™ source within a titanium cervical applicator using liquid water dosimetry and Monte Carlo simulation methods. Methods: Absorbed dose to water measurements were performed using an annulus of Virtual Water™ (referred to as the Captains Wheel) that is mounted in a water phantom to allow measurements in liquid water. The Captains Wheel permits the precise placement of TLD‐100 microcubes around the applicator using aluminum radial gauges of radii 1, 2, 3, and 4 cm. This geometry allows determination of the dose‐rate constant, radial dose function, and azimuthal anisotropy. The air‐kerma strength was measured using the Attix Free‐Air Chamber at the UWADCL and well chamber measurements were completed using two Standard Imaging HDR1000 Plus well chambers. Measurements were performed using two Axxent™ sources calibrated at NIST. Monte Carlo simulations were also performed using MCNP5 based on specifications provided by the manufacturer to calculate the dose‐rate constant, radial dose function, and polar anisotropy. MCNP5 was used to generate the source spectrum exiting the titanium applicator for comparison to the experimental results. Results: The Monte Carlo dose‐rate constant was 3.6% higher than the experimentally determined dose‐rate constant. The radial dose value at 2 cm calculated for a 6 mm pullback distance was 3.5% lower when compared to the measured radial dose value at 2 cm. The azimuthal anisotropy measurements were normalized to the smallest TLD reading at a given distance, with a maximum anisotropy value of 1.27 at 2 cm. Conclusion: TG‐43 parameters were experimentally determined and compared to Monte Carlo simulations for the Axxent™ source within a titanium applicator. Conflict of Interest: Xoft Inc. provided financial support, sources, and applicators. Xoft Inc. provided financial support, sources, and applicators.