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• 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)