Accuracy of the EGSnrc Monte Carlo Code System
Accuracy of the EGSnrc Monte Carlo Code System
Accuracy of the EGSnrc Monte Carlo Code System
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35/47<br />
A problem<br />
• <strong>the</strong> calculated transmission was wrong by up to 7%<br />
compared to <strong>the</strong> 0.64% experimental measurements.<br />
• attenuation by a factor <strong>of</strong> 100 is very sensitive to<br />
errors in cross section.<br />
– consider a monoenergetic case<br />
• T=0.01 => e -mx = 0.01 but say m should be 1.01m<br />
and hence T = e -1.01mx = (e -mx ) 1.01 = 0.095<br />
i.e. a 1% error causes a 5% change in T<br />
• what about photonuclear interactions?
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