EGS_Windows picture archive

NOTE: Unless stated otherwise, these pictures are all © National Research Council of Canada

Do not use without permission!

Electrons are almost always blue (sometimes green)
Positrons are red
Photons are yellow
Sometimes "x"'s are drawn at transport vertices
Sometimes "o"'s are drawn at interaction points
Sometimes the intensity of the lines scales with the particle's energy

Some basic interaction physics:

Co-60 photon in water
Compton recoil electrons from a 1 MeV photon
20 MeV photon interacting in water
20 MeV electons in water
50 MeV photon interacting in lead
50 MeV photon interacting in lead

The effect of longitudinal magnetic fields on 20 MeV electron pencil beams:

0 Tesla, 2 Tesla, 6 Tesla, 10 Tesla, 20 Tesla.

Measurement of stopping power:
(Files to create the graphics were kindly supplied by Bruce Faddegon [NRC] and Miller MacPherson [NRC])

1, 2, 3, 4, 5, 6.

Ion chambers:

1, 2, 3.

Variance reduction:

Save time or reduce variance by:

Bremsstrahlung splitting
Correlations: Compare this, with this
Approximating photon distribitions:
All bremsstrahlung included
Machine-generated bremsstrahlung suppressed
All bremsstrahlung suppressed


Electron transport near a graphite-air cavity
How PRESTA-I models it
What event-by-event Monte Carlo looks like
How PRESTA-II models it
How PRESTA-I models transport near a boundary
How PRESTA-II models it

Other examples:

Electron transport in the phosphor of a TV tube
Electron radiotherapy
Bubble chamber simulation - all particles
Bubble chamber simulation - leptons only
Bubble chamber simulation - side view

Accelerator modelling:

This picture originated with Alan Nahum [RMH-Sutton] but was redrawn at SLAC for Ralph Nelson [SLAC] What it's all about

Data for the rest of these pictures was provided by Bruce Faddegon [NRC] or George Ding [NRC]:
NRC mock-up of a medical accelerator
Philips: 1, 2, 3, 4, 5, 6, 7, 8.
Therac 20: 1, 2, 3, 4, 5.
Varian 2100c: 1, 2, 3, 4.
A "fly-through" a Therac 20:
Approaching the monitor chamber
Approaching the primary collimator
Approaching the applicator
Approaching the patient plane
Do we hit the tumour or not?

The radiotherapy benchmark experiment:

Experimental set-up, electron trajectories
Experimental set-up, photon trajectories
Electron transport in the vicinity of the heterogeneity
Dose perturbation behind an air heterogeneity
Dose perturbation behind the aluminum heterogeneity

More contributions are welcome!

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