Advanced Physics for Brachytherapy 2018

Current LDR Brachytherapy Sources

• Low-energy LDR sources (seeds) – 125 I and 103 Pd most common with 131 Cs gaining interest – about 4.5 mm long and 0.8 mm diameter copsules – treatments either temporary or permanent 0.4 < D Rx < 2 Gy/h • High-energy LDR sources (increasingly rarely) – 137 Cs tubes and 192 Ir ribbons or wire – treatments mainly temporary ( 137 Cs or 192 Ir), or permanent ( 192 Ir)