BEGIN:VCALENDAR VERSION:2.0 PRODID:-//linuxsoftware.nz//NONSGML Joyous v1.4//EN BEGIN:VEVENT SUMMARY:The Lunar Ionising Radiation Environment - a benchmark model DTSTART:20251204T090000Z DTEND:20251204T110000Z DTSTAMP:20260815T122553Z UID:aa10d326-73cc-4839-8724-a69623797df4 SEQUENCE:1 CREATED:20251203T094202Z DESCRIPTION: A Geant4-based Monte Carlo application was developed to model the Galactic Cosmic Ray (GCR) induced radiation environment on the lunar surface. It was adapted from ESA’s detailed Mars Energetic Radiation Env ironment Model\, incorporating lunar-specific geometry and regolith compos ition. The simulations use the Badhwar–O’Neill 2020 model to derive th e GCR spectrum\, reproducing it both in spectra and in solar modulation. S imulations successfully reproduced the expected GCR spectra and solar modu lation trends for 2009 (solar minimum) and 2015 (solar maximum). The resul ting primary and albedo Linear Energy Transfer (LET) spectra showed good a greement with CRaTER measurements aboard the Lunar Reconnaissance Orbiter\ , accurately capturing the observed spectral shapes. Comparisons with HZET RN calculations further confirmed consistent modeling of secondary particl e production and transport. The simulation framework developed in this wor k establishes a reliable baseline for evaluating lunar radiation hazards a nd supports future analyses of shielding eWectiveness\, habitat exposure\, and astronaut dosimetry for both short and longduration missions. LAST-MODIFIED:20251203T094202Z LOCATION:Online URL:http://df.vps.tecnico.ulisboa.pt/en/events/the-lunar-ionising-radiatio n-environment-a-benchmark-model/ X-ALT-DESC;FMTTYPE=text/html:

A Geant4-based Mon te Carlo application was developed to model the Galactic Cosmic Ray (GCR) induced radiation environment on the lunar surface. It was adapted from ES A’s detailed Mars Energetic Radiation Environment Model\, incorporating lunar-specific geometry and regolith composition.

The simulation s use the Badhwar–O’Neill 2020 model to derive the GCR spectrum\, repr oducing it both in spectra and in solar modulation. Simulations successful ly reproduced the expected GCR spectra and solar modulation trends for 200 9 (solar minimum) and 2015 (solar maximum). The resulting primary and albe do Linear Energy Transfer (LET) spectra showed good agreement with CRaTER measurements aboard the Lunar Reconnaissance Orbiter\, accurately capturin g the observed spectral shapes.

Comparisons with HZETRN calculat ions further confirmed consistent modeling of secondary particle productio n and transport. The simulation framework developed in this work establish es a reliable baseline for evaluating lunar radiation hazards and supports future analyses of shielding eWectiveness\, habitat exposure\, and astron aut dosimetry for both short and longduration missions.

END:VEVENT END:VCALENDAR