Date: Sun, 4 Jan 2015 10:51:26 +0800 (GMT+08:00)
Dear Alberto，
According to you，FLUKA handles photons as particles，the Rayleigh or coherent scattering is included. So the refraction of photons at (steep) interfaces of different materials should be observed. Please see the paper attached, the phase contrast at the material interface are explained by refraction, which causes the intensity modulation phenomenon at the interface. Why can not we see the same phenomenon in the Fluka simulation? The attachments are my input file and the result.
Best Regards
Chen Yuan
-----原始邮件-----
发件人:"Fasso, Alberto" <fasso_at_slac.stanford.edu>
发送时间:2015-01-03 23:18:44 (星期六)
收件人: "shaogch_at_mail.ustc.edu.cn" <shaogch_at_mail.ustc.edu.cn>, "fluka-discuss_at_fluka.org" <fluka-discuss_at_fluka.org>
抄送:
主题: [fluka-discuss]: RE: [fluka-discuss]: Re: [fluka-discuss]: Transmittance do not agree with NIST！！！
Phase contrast imaging is based on wave behaviour of photons (interference and diffraction). FLUKA handles photons only as particles, so it cannot simulate x-ray phase contrast imaging. For the same reason, FLUKA can simulate wigglers, but not undulators
Alberto
From:owner-fluka-discuss_at_mi.infn.it <owner-fluka-discuss_at_mi.infn.it> on behalf of shaogch_at_mail.ustc.edu.cn <shaogch_at_mail.ustc.edu.cn>
Sent: Saturday, January 3, 2015 3:48 AM
To:fluka-discuss_at_fluka.org
Subject: Re: [fluka-discuss]: Re: [fluka-discuss]: Transmittance do not agree with NIST！！！
Dear Mikhail，
Thank you for your reply.Can Fluka simulate x-ray phase contrast imaging? If it can,How should I do?
Best Regards
Chen Yuan
-----原始邮件-----
发件人:"\"Mikhail Polkovnikov <Михаил Полковников>\"" <pmk_at_ihep.ru>
发送时间:2014-12-31 00:47:12 (星期三)
收件人:shaogch_at_mail.ustc.edu.cn, fluka-discuss_at_fluka.org
抄送:
主题: [fluka-discuss]: Re: [fluka-discuss]: Transmittance do not agree with NIST！！！
On 30.12.2014 16:13, shaogch_at_mail.ustc.edu.cn wrote:
Dear Fluka users：
When I use X-ray to irradiate target,the transmittance F2/F1(F2 is the flux density from the target and F1 is the flux density from the vacuum) is smaller than the transmittance estimated from NIST website(http://physics.nist.gov/PhysRefData/XrayMassCoef/chap2.html) .Why does this happen? The primary X-ray energy is 10 keV.The production and transport cutoff I set for photon is 100 eV. TheproductionandtransportcutoffIsetfor electron is 1 keV. The attachments are my input file and output file.Please have a look at it.In a word,I don't know why the transmittance from fluka(about 50%) do not agree with NIST(about 97%).
On the other hand,When I see my output file,it shows the following warning:
**** Warning!!! Least square fit for blccra failed to keep max. rel. Blcc err. below 1% ****
**** Max. error is 21.8 %, for beta2 = 0.03260 ****
ZTILDE,AE1O3,BLCCRA= 1.20779E+01 2.08102E+00 1.52566E-02
**** Warning!!! Least square fit for blccre failed to keep max. rel. Blcce err. below 1% ****
**** Max. error is 5.3 %, for beta2 = 0.00358 ****
What does this warning mean? Does it will affect the fluence scored by the usrbin detector? Any suggestions will be appreciated.
Best Regards
Chen Yuan
Dear Chen Yuan,
In your COMPOUND cards the "Mix" is set as atoms, but "f1" and "f3" are fractions of 1. like volume or mass.
Are you sure that your mix is correct?
If "Mix:" set as mass the result in attachment.
Best regards,
Mikhail
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(image/jpeg attachment: ATT00001.jpg)
- application/octet-stream attachment: qiu.inp
- application/pdf attachment: Refraction-enhanced_x-ray_radiography_for_inertial_confinement_fusion_2009.pdf
(image/jpeg attachment: image002.jpg)