The 3D dose distribution around HDR brachytherapy sources used in cancer treatment is difficult to measure accurately due to the steep dose gradients.

The use of alanine pellets of 2.5 mm and 5 mm diameter to measure 3D dose distribution around a 192Ir microSelectron v1 source has been investigated.

Pellets arranged in vertical stacks inside a water phantom were used to obtain a 3D dose map. Alanine is a good choice of dosimeter for these measurements, achieving a good agreement with published results.

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