Purpose: A dosimetric audit of Ir-192 high dose rate (HDR) brachytherapy remote afterloading
units was carried out in 2019. All six brachytherapy departments on the island of
Ireland participated in an end-to-end test and in a review of local HDR dosimetry
procedures. Materials and methods: A 3D-printed customised phantom was created to
position the following detectors at known distances from the HDR source: a Farmer
ionization chamber, GafChromic film and thermoluminescent dosimeters (TLDs). Dedicated
HDR applicator needles were used to position an Ir-192 source at 2 cm distance from
these detectors. The end-to-end dosimetry audit pathway was performed at each host
site and included the stages of imaging, applicator reconstruction, treatment planning
and delivery. Deviations between planned and measured dose distributions were quantified
using gamma analysis methods. Local procedures were also discussed between auditors
and hosts.
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