Re: [fluka-discuss]: How to make the results from userBDX match with userTrack

From: Paola Sala <>
Date: Sat, 14 Mar 2020 19:04:47 +0100

USRTRACK and USRBDX measure two different quantities, they cannot be the
USRTRACK measures particle fluence WITHIN the region specified in input.
USRBDX measures particle fluence AT THE BOUNDARY between two regions
specified in the input. (by the way in your input the second region is not
defined, thus the default is taken, which is region number 2, VOID. )
Depending on the setup, these two can be very different.
In addition, you are asking current instead of fluence for the BDX.
Hope this helps
> Hi,
> I am trying to compare between userTrack and userBDX. I discovered that
> their results don’t match together even for same input.
> [cid:681B72A1-26AD-483D-BABF-EFBE7C4CA0EF]ŰȘÙˆ
> I was thinking that because of the deference in the units , so
> [cid:930AC2D5-FF45-4294-A338-596BEACC1D0B]
> To reach to this goal, I tried to compare between two userBDX for
> different parameters.
> [cid:371137C2-C09D-4134-A351-3AD97BACFE97]
> For this case its match in 2 steradian but it will increase until 6
> steradian and match again for higher steradian than 6 .
> I don’t understand why that? Since the detector area is a circle (pi
> r^2) = 3.14 and 1 steradian =(pi r^2)/R^2 = 3.14/(10^2)=0.0314
> Why it doesn’t match together at 2 steradian and above ?
> I don’t know how to make useTrack and userBDX match together
> [cid:F4B3D4F1-C159-49E8-803A-C120A7E75488]

Paola Sala
INFN Milano
tel. Milano +39-0250317374
tel. CERN +41-227679148

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Received on Sat Mar 14 2020 - 20:29:29 CET

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