Dear Anna,
Thanks a lot for your help. The latest version of FLUPIX or FLAIR indeed has the bug (always obtains a ZERO result for my problem in my and others computer), I wish the team could repair it.
All the best!
Tao Yang
> -----原始邮件-----
> 发件人: "Anna Ferrari" <a.ferrari_at_hzdr.de>
> 发送时间: 2016年5月9日 星期一
> 收件人: "YANG Tao" <yangt_at_ihep.ac.cn>, "Mikhail Polkovnikov <Михаил Полковников>" <pmk_at_ihep.ru>
> 抄送: fluka-discuss_at_fluka.org
> 主题: [fluka-discuss]: Re: [fluka-discuss]: γ ray count problem using USRBDX
>
> Dear Yang Tao,
> sure that in a shielding problem you have to study also the secondaries...
> no doubt about it (in some cases you can conclude that it's enough to
> optimize the shielding only for the primary radiation, but this depends on
> the problem and on the requirements you have).
> The point here is that if you want to check your simulation with the tables
> of the mass attenuation coefficients (which represent the photon interaction
> probability, and then describe the attenuation of primary photons), then
> you have to consider the primaries in the scoring, as pointed out by
> Mikhail.
> Best,
> Anna
>
> Am Fri, 6 May 2016 21:01:19 +0800 (GMT+08:00) schrieb "YANG Tao"
> <yangt_at_ihep.ac.cn>:
> > Dear Mikhail!
> > Thanks for your detailed reply. I still don't understand why it only scores
> >the primary photon, in reality, for the lead shielding effect problems, don't
> >we consider the attenuation of all photons(primary + scattered)? Don't the
> >scattered photons out of the lead block still need to be shielded?
> >
> >
> > -----原始邮件-----
> > 发件人: "Mikhail Polkovnikov <Михаил Полковников>" <pmk_at_ihep.ru>
> > 发送时间: 2016年5月6日 星期五
> > 收件人: fluka-discuss_at_fluka.org, "YANG Tao" <yangt_at_ihep.ac.cn>
> > 抄送:
> > 主题: Re: [fluka-discuss]: γ ray count problem using USRBDX
> >
> >
> > On 06.05.2016 12:32, YANG Tao wrote:
> >
> > Dear Mikhail!
> >
> >
> > Thanks a lot for your reply! It may be the problem of the FLAIR software in
> >my computer, I got the correct result in the server. But I have some other
> >problems as follows:
> >
> >
> > 1. What's the difference of BEAMPART and PHOTON in my input file? The
> >BEAMPART is indeed photon in my input, so the two settings are both correct,
> >do you think so?
> >
> >
> > 2. You set the fluence scoring instead of current scoring in the USRBDX
> >card, Why do you set as this form, in my opinion, the COUNT of the photon
> >number should be one-way current scoring. Besides, the output photon
> >number is not the same for the two different setting of the USRBDX card.
> >However, in formula calculations the results I/I0 should be 2.1E-4 and your
> >input file gets the correct result(about 2.0E-4 _at_primary number is 1000), and
> >the one-way current setting in USRBDX gets a much bigger result (~1.0E-3).
> >
> > Could you solve the puzzles for me?
> >
> >
> > All the best!
> >
> >
> > Tao Yang
> >
> >
> > -----原始邮件-----
> > 发件人: "Mikhail Polkovnikov <Михаил Полковников>" <pmk_at_ihep.ru>
> > 发送时间: 2016年5月6日 星期五
> > 收件人: "YANG Tao" <yangt_at_ihep.ac.cn>, fluka-discuss_at_fluka.org
> > 抄送:
> > 主题: Re: [fluka-discuss]: γ ray count problem using USRBDX
> >
> >
> > On 06.05.2016 04:21, YANG Tao wrote:
> >
> > Hello, everyone!
> >
> >
> > I simulate the lead shielding effect for γ ray recently, but I got a strange
> >result. Beam position is at (0,0,0) and the beam direction is in z-direction.
> >The gamma rays were directed towards a simple cuboid lead block with 10.5 cm
> >in thickness and 200cm*200cm in length and width. USRBDX score card has been
> >used to obtain the transmission values, I/I0, where I0 and I are the incident
> >and attenuated photon intensities. Theoretically, I0 is 1 photon/primary
> >since the incident photon will all penetrate the front surface of the lead
> >block, however, the result (31BIN, "rushe") always give ZERO result, it's
> >confusing, where did the photons go? Additionly, the exit photon (32BIN,
> >"chushe") also give a wrong results compared to other literature.
> > These problems have confused me for several days, so any help will be
> >appreciated much!!!
> >
> > Thank You!
> >
> > Tao Yang
> >
> > CAS
> >
> >
> > Dear Tao Yang,
> >
> > If you are interested only in attenuation of primary photons, you can try
> >these two USRBDX's:
> >
> > *...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....
> > USRBDX 109. BEAMPART 21. valeft qiankuai 1.in
> >
> > USRBDX 1.0E-3 8.0E-4 1. 1. &
> >
> >
> > *...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....
> > USRBDX 109. BEAMPART 21. qiankuai varigh 1.out
> >
> > USRBDX 1.0E-3 8.0E-4 1. 1. &
> >
> >
> > In - input fluence before lead block
> >
> > out - output fluence after lead block
> >
> > The value (out / in) is close to the formula calculations ( mu = 0.07102
> >cm^2/g, density = 11,35 g/cm^3)
> >
> >
> > Best regards,
> >
> > Mikhail
> >
> >
> > --
> >
> >
> > 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
> >
> >
> > Dear Tao Yang,
> >
> >
> > 1. In your case BEAMPART are only primary photons from the source, PHOTON
> >are all photons (primary + scattered). That is why the result with
> >part=PHOTON in your USRBDX is bigger.
> > 2. You can set one-way current scoring and the result will be basically the
> >same for BEAMPART photons.
> >
> > Best regards,
> > Mikhail
> >
> > --
> >
> >
> > 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
> >
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Dr. Anna Ferrari
> Institute of Radiation Physics
> Helmholtz-Zentrum Dresden-Rossendorf e.V.
> Tel. +49 351 260 2872
> a.ferrari_at_hzdr.de
> http://www.hzdr.de
>
> Vorstand: Prof. Dr. Dr. h. c. Roland Sauerbrey, Prof. Dr. Dr. h. c. Peter
> Joehnk
> Vereinsregister: VR 1693 beim Amtsgericht Dresden
>
> __________________________________________________________________________
> You can manage unsubscription from this mailing list at https://www.fluka.org/fluka.php?id=acc_info
>
--
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 Mon May 09 2016 - 11:50:25 CEST