Advanced Physics for Brachytherapy 2018

Type B uncertainty … input Source geometry ➢ Information is required on geometry, materials, density, elemental composition, and dimensions. ➢ The uncertainty of this information is more crucial for low energy sources ➢ For reference dosimetry of new sources geometry and dimensions should be verified experimentally in a sample of sources. ➢ If the source includes parts of non-negligible mobility, MC should be performed for different configurations and results averaged.

contact tr. radiography (IsoSeed I25.S17plus)

seed cut out view (3631 A/M)

e microscopy (6711)

Pantelis et al, J Contemp Brachytherapy 5(4), 240 (2013)

Pics from: Rogers & Cygler (Eds), Clinical dosimetry measurements in radiotherapy (2009 AAPM Summer School), Monograph No. 34, Medical Physics Publishing 2011