[fluka-discuss]: Transmittance do not agree with NIST!!!

From: <shaogch_at_mail.ustc.edu.cn>
Date: Tue, 30 Dec 2014 21:13:45 +0800 (GMT+08:00)

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

 





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Received on Tue Dec 30 2014 - 16:13:48 CET

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