An estimate of the contribution of high energy cosmic-ray protons to the absorbed dose inventory of a cometary nucleus

Details An estimate of the contribution of high energy cosmic-ray protons to the absorbed dose inventory of a cometary nucleus An estimate of the contribution of high energy cosmic-ray protons to the absorbed dose inventory of a cometary nucleus

Aug 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ap%26ss.125...49r&link_type=abstract

Astrophysics and Space Science (ISSN 0004-64oX), vol. 125, no. 1, Aug. 1986, p. 49-67.

Astronomy and Astrophysics

Astrophysics

10

Comet Nuclei, Cosmic Rays, High Energy Interactions, Protons, Radiation Absorption, Energy Absorption, Particle Collisions, Proton Energy, Radiation Dosage, Radioactive Isotopes

Scientific paper

We discuss the contribution of cosmic-ray protons at all energies above 1 MeV to the absorbed doses of the surface layers of a comet. Since there exists no calculation which takes into account proton energy losses by means of losses to electrons and nuclear collisions (in a cascade process), and losses due to the low energy end-products of the cascade, we have made a rough estimate of all of these contributions. An analytical formula is proposed that allows a rapid estimate of ranges and the dose absorbed at any depth. We give dose-depth curves for two extreme values of the energy at which nuclear collisions begin to dominate the slowing-down process, and for an intermediate value we display the dose-depth curve down to 20 m from the surface. The relevance of these findings to dosimetry in comets and some alterations of cometary material are considered. The need for improving the analytical expression proposed is stressed

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