Title page Life on Mars? Modeling the subsurface radiation environment Lewis Dartnell CoMPLEX University College London Andrew Coates, MSSL John Ward,

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CHAPTER 22 Nuclear Chemistry

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Presentation transcript:

Title page Life on Mars? Modeling the subsurface radiation environment Lewis Dartnell CoMPLEX University College London Andrew Coates, MSSL John Ward, Biochemistry Laurent Desorgher, Bern

Summary Astrobiology & Mars Radiation environment My research & computer model

Mars today 6 mbar atmosphere, freezing surface temperatures, bone- dry surface sterilised by UV and cosmic radiation

Refugial Life Could extremophile life persist beneath the surface, within pockets of liquid water…? Deep hot Biosphere on Earth. Methane plumes detected seeping out of ground.

Space radiation

Secondary cascades CGR primary produces extensive shower of secondary particles, with a core of hadrons (nuclear fragments, protons, neutrons) and pions within a spreading cone of the electromagnetic cascade (gamma and electrons) mediated by muon decay. Pfotzer maximum in Earth’s atmosphere at an altitude of ~60,000ft Flux diminished to ~1% at sea-level

Biological effects Direct & Indirect, [O 2 ] & Temp. dependence E. coli B. subtilis D. radiodurans

The Model

Sites of interest

Results I

Results II

Results III

Results IV

Final Goal Which sites should we send our landers to? How deep would they need to drill? Coming up… Persistence time of biomarkers Optically-Stimulated Luminescence (OSL) dating Lab work

… questions ?