|Message: What is considered an overlap in geometry?||Not Logged In (login)|
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I have been doing simple test runs calculating fluence of gammas on a hollow Al sphere irradiated by electrons. To my surprise, the gamma fluence to the sphere was not zero. I assume now that gammas come from the sphere from the inside and get into the sphere again (if I make the sphere solid, the fluence becomes 0).
If I add Va volumes just outside of the sphere (1mm off compared to 30cm radius of the sphere) and just inside the sphere (1mm off again), I see that almost all gammas coming from the sphere enter the vacuum volumes (the fluence from the sphere is close to the sum of fluences to the vacuum shapes). The number is the same as in the simulation with just Al sphere. If I make vacuum volumes match the sphere radius, the gamma fluence comes to zero.
Is it ok to make one shape have outer radius be equal to the inner radius of another shell? Why the results are so different compared to the case with a little offset?
Thank you, Sveta
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