[Gate-users] Percent depth dose anomaly

[MURPHY, James (ROYAL CORNWALL HOSPITALS NHS TRUST)]

Hi
I have found something strange and hope you may be able to help. I have a phase space for a position below the linac head and I have used this as the source for a phantom dose measurement in PRIMO (PENELOPE variant) to get a depth dose which matches our water tank data. But when I use this in Gate (simple geometry, 1m air and 40 cm water) I get a much larger depth dose, dmax is the same though. I even get the same results using penEasy (another PENELOPE variant).I would be very grateful for any ideas.

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Regards.


James Murphy
Trainee Medical Physicist
Radiotherapy Physics
Sunrise Centre
Royal Cornwall Hospitals Trust
Truro
Cornwall
TR1 3LJ

' 01872 25 8321/8320
          Ext 8321/8320
*    james.murphy18 at nhs.net<mailto:james.murphy18 at nhs.net>

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