Dear Stefan,
Thanks for your help. I will continue to study it.
> -----原始邮件-----
> 发件人: "Stefan Roesler" <sroesler_at_mail.cern.ch>
> 发送时间: 2016年6月28日 星期二
> 收件人: "YANG Tao" <yangt_at_ihep.ac.cn>
> 抄送: fluka-discuss_at_fluka.org
> 主题: Re: [fluka-discuss]: A puzzled neutron shielding problem!
>
> Dear Tao Yang
>
> If you want to judge on fluence on a lethargy repreentation (E dPhi/dE)
> you have to look at a log-lin plot. If you do that you will see that most
> of your "Tot. resp." is in the highest energy bin and follows perfectly
> the decrease that you see in the sum.lis file
>
> Cheers
> Stefan
>
>
> On Wed, 22 Jun 2016, YANG Tao wrote:
>
> >
> > Hello, everyone!
> >
> >
> > I simulated the neutron shielding effect by three layers as shown in fig1,
> > the first layer is 4-cm-thick iron, the second layer is 4-cm-thick borated
> > polyethylene(BPE), and the last one is 2.5-cm-thick lead. Neutrons of 1 MeV
> > injects on the iron layer from left to light. Now I set three scoring
> > cards(USRBDX, one-way current) at the interface of iron to BPE, BPE to lead
> > and lead to the right vacuum to obtain the neutron fluence. However, I
> > obtain the strange results as shown in fig2, it seems that the neutron
> > number becomes greater after they penetrate the BPE layer since the red line
> > is higher than the black line. But when I check the corresponding ! sum.lis
> > files, the Tot. resp. is respectively 0.7257115, 0.3018902, 0.1735702 ,
> > which are reasonable for the neutron counting decreases as they penetrate
> > the layers. However, how to explain the inconformity of fig2 and the total
> > response (neutron counting) in sum.lis files?
> >
> > Could someone help me in this question please?
> >
> > Thank you.
> >
> > With the best regards,
> >
> > Tao Yang
> >
> > CAS
> >
> >
> >
--
杨涛
中科院高能所东莞分部（东莞中子科学中心）加速器技术部
地址：东莞市大朗镇中子源路1号中国散裂中子源A2栋606室
E-mail：yangt_at_ihep.ac.cn
电话：0769-38944239
邮编：523803
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Received on Wed Jun 29 2016 - 06:51:02 CEST