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None Re: serious problem with benchmark 

Keywords: neutron ambient dose
Forum: Hadronic Processes
Re: None serious problem with benchmark (Sylvia Studeny)
Date: 31 Oct, 2006
From: Sylvia Studeny <sylvia.studeny@gsf.de>

Hi, I found out that I have the possibility to compare the flux (binned into 15 energy bins) in the small measuring voxel with calculations performed with MCNP (results were used to calculate the ambient dose equivalent published in the ICRU 57 report).

Unfortunately, my flux is totally wrong! There seem to be no prozesses that make the neutrons loose energy and appear in a bin with less energy. That means, that there was only flux in the highest possible energy bin. What does this mean? How can I test and make sure that the program uses the hp-crosssections that I defined? I found the place in the code where the crosssection are that are used when there are no others defined. Unfortunately they are totally uncomrehensible. It seems to me that this part was direktly taken from the GHEISHA part of geant3 (which was not very well dokumentet in itself), leaving all description out: what is cnlwat,cnlwel,NCNLW,NELAB and all those cryptic numbers at the side?

Thanks a lot, Sylvia

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