Frederic Tessier

**Describe the issue** When not using any subgeometry in `egs_chamber`, the message `initScoring: missing/wrong 'sub geometries' for geometry`... is echoed, leading the user to think that this is a mistake,...

Outdated default options in EGSnrc documentation

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Default options for transport parameters in the EGSnrc manual `PIRS-701` needs updating. For example, @dworogers noted the following outdated passage regarding the default photon cross section: > In the current...

### Description The photon mean free path is incorrect when both `Rayleigh scattering = On` _and_ `Photonuclear attenuation = On`. Given a density $\rho$, and a cross section $\sigma_0 \equiv...

Clarify that multiple-scattering transport is triggered only if the intended electron step is longer than a skin depth, even in bulk media away from any region boundaries. This improves efficiency,...

## Description When using the fluence scoring object in egs++, the electron fluence is zero if the region material is vacuum. ## To Reproduce 1. Use the egs++ input below...