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## Why is change in KineE not equal to dEStep?

Forum: Event and Track Management
Date: 05 Sep, 2011
From: Neil Fazel <Neil Fazel>

 I'm using verbose tracking to print out the kinetic energy (KineE) and total energy deposited (dEStep) at each step on a track. I see that dEStep does not equal the change in KineE. For example, below you see that for Step# 3, KineE has decreased to 159 MeV from 999 MeV, but dEStep is only 4.73 keV. What happened to kinetic energy difference (840 MeV) and what does dEStep = 4.73 keV represent? (This is for a 1 GeV e- passing through a 1 cm layer of Pb.) Thanks, Neil ```********************************************************************************************************* * G4Track Information: Particle = e-, Track ID = 1, Parent ID = 0 ********************************************************************************************************* ``` ```Step# X Y Z KineE dEStep StepLeng TrakLeng Volume Process 0 0 fm 0 fm -1 cm 1e+03 MeV 0 eV 0 fm 0 fm World initStep 1 0 fm 0 fm -5 mm 1e+03 MeV 2.87 keV 5 mm 5 mm World Transportation 2 -3.49 um 2.13 um -4.08 mm 999 MeV 1.19 MeV 918 um 5.92 mm Lead eBrem 3 -3.58 um 2.09 um -4.08 mm 159 MeV 4.73 keV 7.15 um 5.92 mm Lead eBrem 4 -26.8 um 43.7 um -2.6 mm 147 MeV 2.08 MeV 1.47 mm 7.4 mm Lead eBrem 5 -19.8 um 12.8 um -2.12 mm 126 MeV 668 keV 486 um 7.88 mm Lead eBrem 6 -19.7 um 12.8 um -2.12 mm 125 MeV 320 eV 689 nm 7.88 mm Lead eBrem 7 87.1 um -93.3 um -931 um 124 MeV 1.48 MeV 1.2 mm 9.08 mm Lead eBrem 8 128 um -105 um -623 um 121 MeV 561 keV 312 um 9.39 mm Lead eBrem 9 408 um -303 um 1.37 mm 80.9 MeV 2.95 MeV 2.02 mm 1.14 cm Lead eBrem 10 509 um -386 um 2.46 mm 69.2 MeV 1.28 MeV 1.1 mm 1.25 cm Lead eBrem 11 835 um -631 um 4.61 mm 65 MeV 2.76 MeV 2.2 mm 1.47 cm Lead eIoni 12 978 um -696 um 5 mm 64.5 MeV 471 keV 423 um 1.51 cm Lead Transportation 13 2.34 mm -1.21 mm 8.76 mm 64.5 MeV 646 eV 4.03 mm 1.92 cm World eIoni 14 2.79 mm -1.38 mm 1 cm 64.5 MeV 127 eV 1.33 mm 2.05 cm OutOfWorld Transportation```

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1 Re: Why is change in KineE not equal to dEStep?   (michel maire - 06 Sep, 2011)
Re: Why is change in KineE not equal to dEStep?   (Neil Fazel - 06 Sep, 2011)
 to: "Why is change in KineE not equal to dEStep?"
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