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19matthew89

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- How to define surface tallies of a cell?

Hi,

I have a question concerning surface tallies like F1 and F2. You have to provide a surface for them. Since, surfaces are defined as infinite (infinitely long cylinders, infinitely extended planes) how can you write the surface tally of a cell? What are the actual tally surfaces for F1 anf F2? The whole (infinite) surfaces or the actual surface of a cell?

As a quick example let's consider a z cylinder

So

will define the cell 1 which is a cylinder of radius 1 cm and height 20 cm.

May aim is tallying the surface flux F2 through the surface of the cylinder. How can I do it?

Is this

right?

The manual says that if I use the parenthesis I will get a tally through the union of the surfaces but I'm not interested in the union.

Thanks a lot in advance!

P.S. I know a solution to be sure would be segmenting, but I am hoping for a less cumbersome solution and also then about what F2 (or F1) are actually evaluating.

I have a question concerning surface tallies like F1 and F2. You have to provide a surface for them. Since, surfaces are defined as infinite (infinitely long cylinders, infinitely extended planes) how can you write the surface tally of a cell? What are the actual tally surfaces for F1 anf F2? The whole (infinite) surfaces or the actual surface of a cell?

As a quick example let's consider a z cylinder

So

Code:

```
1 M# rho_M -2 3 -4
2 CZ 1
3 PZ -10
4 PZ 10
```

will define the cell 1 which is a cylinder of radius 1 cm and height 20 cm.

May aim is tallying the surface flux F2 through the surface of the cylinder. How can I do it?

Is this

Code:

`F2:N 2 3 4 T`

right?

The manual says that if I use the parenthesis I will get a tally through the union of the surfaces but I'm not interested in the union.

Thanks a lot in advance!

P.S. I know a solution to be sure would be segmenting, but I am hoping for a less cumbersome solution and also then about what F2 (or F1) are actually evaluating.

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