High brachytherapy is
According to ICRU repo 38, treatment dose rates fall into three categories * Low Dose Rate (LDR) brachytherapy ranges between 0.4 and 2 Gy/h. However, in routine clinical practice, LDR brachytherapy is usually delivered at dose rates between 0.3 and 1 Gy/h. This is compatible with conventional manual or automatic afterloading techniques. * Medium Dose Rate (MDR) brachytherapy ranges between 2 Gy/h and 12 Gy/h. MDR can also be delivered by manual or automatic afterloading, although the latter is far more frequent. * High Dose Rate (HDR) brachytherapy delivers the dose at 12 Gy/h or more, and only automatic afterloading can be used because of the high source activity.(Ref: Radiobiology of Brachytherapy and the Dose-Rate Effect by JJ Mazeron et al, 95)
0.4-2 Gy/hour
12 Gy/hour
2-12 Gy/hour
0.01-0.3 Gy/hour
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