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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.
e microscopy (6711)
seed cut out view
(3631 A/M)
Pics from: Rogers & Cygler (Eds), Clinical dosimetry
measurements in radiotherapy (2009 AAPM Summer
School), Monograph No. 34, Medical Physics Publishing 2011
Pantelis et al, J Contemp Brachytherapy 5(4),
240 (2013)
contact tr. radiography
(IsoSeed I25.S17plus)