Demonstrating the use of optically stimulated luminescence dosimeters (OSLDs) for measurement of staff radiation exposure in interventional fluoroscopy and helmet output factors in radiosurgery

摘要

The objective of this work is to obtain preliminary results demonstrating the potential of Optically Stimulated Luminescence Dosimeters (OSLDs) for two types of applications: (a) the determination of staff doses due to scattered radiation in interventional fluoroscopy and (b) the determination of helmet output factors in Gamma Knife~? (Elekta AB.) radiosurgery. These applications represent completely different dosimetric challenges. In interventional fluoroscopy the challenge is the measurement of low doses associated with scattered radiation from a single procedure in a convenient way. To demonstrate the potential of OSL for this type of application, we mapped the dose to an anthropomorphic phantom simulating the physician after a single simulated interventional fluoroscopy procedure. In radiosurgery the challenge is to measure doses for small field sizes with high precision. In this case, we used small OSLDs (2 mm in diameter by 0.3 mm thickness) to determine the output factors for helmet collimation of 18 mm, 14 mm, 8 mm, and 4 mm, showing that the output factor can be obtained with uncertainty <1% (single OSL readout) and in agreement with the literature, except for the controversial case of 4 mm collimation. Combined, the results on the application of OSLDs to these two different challenges demonstrate the versatility of the OSL technique.