I have a problem calculating the surface dose when simulating the Gamma Knife machine

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1

Hi Experts,
I am simulating a source of the Gamma Knife machine projecting onto a spherical phantom. The water phantom contains a tumor (4cmx4cmx4cm). I calculated the horizontal surface dose on the tumor. I have done simulations with phits and Geant4. I run 10e9 particles.

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But the result of the dose horizontally ​in Geant4 got the error. I checked the geometry, materials, physics library, and particle generation. And I referenced the gamma knife simulation in the Geant4 example for the particle generation and physics library.
Can you suggest where the problem occurs in the program?
Many thanks

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Hi duydhust
Could you please explain how did you score lateral dose?

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Hi keyvantabaei
I use class G4ScoringManager to score.

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Hi duydhust,
sorry,I have not experienced G4ScoringManager a lot, I have done lateral dosimetry before by using G4Parametriation and SensitiveDetectors, It may be because of your number of bins if you have assigned them low, I hope someone else would help you

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