Proton Calorimetry/Meetings/2017/03/29: Difference between revisions

Latest revision as of 14:11, 29 March 2017

Simon Jolly, Laurent Kelleter, Anastasia Basharina-Freshville

ABF:

Looking at specific peak PMT current:
- Acquire data with different rates:
- Calculate average current to compare at what point saturation occurs.
- Matches predictions almost exactly!
- Small rise at "saturation" current before drop off.
Will pass on information to Hamamatsu to "guide" them in producing lower gain PMTs.

LK:

Looking at dose build-up effect in proton therapy and secondary particles.
- Secondary particles in Geant4 difficult to characterise due to range cut.
- GetTotalEnergyDeposit() doesn't include energy from secondary particles...
- Need to check whether 20 micron range cut is short enough with Adam Gibson.
Clear build-up effect from secondary protons:
- Need to check RBE of the resulting short-range protons.
- Effect of hadronic build-up means Bragg curve incorrect for entrance dose.

@@ Line 6: / Line 6: @@
 '''ABF''':
-*
+* Looking at specific peak PMT current:
+** Acquire data with different rates:
+** Calculate average current to compare at what point saturation occurs.
+** Matches predictions almost exactly!
+** Small rise at "saturation" current before drop off.
+* Will pass on information to Hamamatsu to "guide" them in producing lower gain PMTs.
 '''LK''':
 * [http://www.hep.ucl.ac.uk/pbt/wikiData/presentations/2017/LK20170329_ProtonBuildUp.pdf Looking at dose build-up effect in proton therapy and secondary particles].
-** Dose increases at start of X-ray depth dose curve due to short-range electron shower.
+** Secondary particles in Geant4 difficult to characterise due to range cut.
-** Effect present for protons but much smaller.
+** <code>GetTotalEnergyDeposit()</code> doesn't include energy from secondary particles...
-* Managed to reproduce results over 10mm from Benjamin Tham's previous simulations.
+** Need to check whether 20 micron range cut is short enough with '''Adam Gibson'''.
-* Build-up effect present for both electrons and secondary hadrons, but build-up much shorter for electron shower (~1mm).
+* Clear build-up effect from secondary protons:
-* Will run simulations for 100MeV and 200MeV with higher statistics.
+** Need to check RBE of the resulting short-range protons.
+** Effect of hadronic build-up means Bragg curve incorrect for entrance dose.