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Schematic overhead view of the Nucletron‐type 077.211 jig and Farmer chamber (not to scale). This jig was used to determine the AKR of the source. A modified form of this jig was used for TLD calibration Methods 1 and 2, however the source‐to‐detector distance was 50 mm for these measurements (i.e., catheter 1‐catheter 2 distance was 100 mm)
