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Difference in the Measured and Calculated PDD

Hello All,

 

I have simulated for the 6MV beam using Phase Space files from the varian  data. But when I tried to compare with the calculated PDD, there was drastic variation. The measured PDD when I plot using Excel it was perfect. But when use that PDD to compare in PRIMO there is a variation. I have attached the screen shot for this. Kindly guide me in this.

Thank You

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