Date: Tue, 30 Dec 2014 19:47:12 +0300
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. The production and
> transport cutoff I set for 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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