Using the 6-MV PDD chart,what is the dose at 10 cm if the dose at Dmax is 300 cGy per day on a 6-MV beam for a field size of 15 x 18?

Name: Using the 6-MV PDD chart,what is the dose at 10 cm if the dose at Dmax is 300 cGy per day on a 6-MV beam for a field size of 15 x 18?
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Quizplus · Accepted Answer

First find the equivalent square using Sterling's formula.A 15 x 18 equivalent square is 16.36.Look up the PDD on the 6-MV chart (Table 24-6)and interpolate to get a PDD of 70.26 %.

Using the 6-MV PDD Chart,what Is the Dose at 10