ESTRO 2024 - Abstract Book

S333

Beachytherapy - Physics

ESTRO 2024

The black frames represent the values for the detection limits calculated as the sum of three times the peak’s uncertainty plus the uncertainty of the fitted background at the peak’s position. As the peaks of the Au-L-Lines at 9.7, 11.4 and 13.4 keV are below the frame they are not detected by the algorithm. This result is realistic, as the seed doesn’t feature any golden components. By contrast, the Ti-K-lines at 4.5 and 4.9 keV, arising from the capsule, are clearly detected, as well as the Mo-K-lines at 17.4 and 19.7 keV, arising from the marker.

Conclusion:

An automated spectrometry set-up for LDR brachytherapy seeds will enable PTB to offer spectrometry as integral part of the calibration service in the future.

Keywords: LDR-BT, Calibration Service, spectrometry

References:

[1] L. A. DeWerd, M. S. Huq, I. J. Das, G. S. Ibbott, W. F. Hanson, T. W. Slowey, J. F. Williamson, and B. M. Coursey, "Procedures for establishing and maintaining consistent air-kerma strength standards for low-energy, photon emitting brachytherapy sources: Recommendations of the Calibration Laboratory Accreditation Subcommittee of the American Association of Physicists in Medicine," Med. Phys. 31, 675-681 (2004). [2] J. L. Campbell, D. J. T. Cureatz, E. L. Flannigan, C. M. Heirwegh, J. A. Maxwell, J. L. Russell, S, M. Taylor, “The Guelph PIXE Software Package V,” Nucl. Instrum. Meth. B499. 77-88 (2021). https://doi.org/10.1016/j.nimb.2021.05.004

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