AAPM Report Task Group 71 described recommendation for manual calculation of Monitor Unit calculation for photon and electron beams. In this report, d0 =10 cm (depth of normalization) used as reference depth. It not use dmax (depth of maximum dose) as reference depth.
How does if we do manual calculation of treatment time cobalt?
Is AAPM Report TG 71 applicable for calculation of treatment time cobalt-60 ?
can we use this recommendation?
if yes, how many reference depth that we must choose?
dmax
d0=10cm
or d0=5cm
thanks a lot for your discussion.
For proper measurement of the beams, some reference depth other than depth of maximum dose is recommended. Although for Co-60, 4MV-9MV 5cm is sufficient and for energy more than 9MV, 10cm is recommended by IAEA and other protocols but we can use 10cm or more and the at Dmax for any beam, the calculated dose will be same.
dose at Dmax of Co-60= Measured dose at any depth x 100 / PDD at that depth
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