Measuring Neutrons and Gamma Rays on Mars - The Mars Science Laboratory Radiation Assessment Detector MSL/RAD

Details Measuring Neutrons and Gamma Rays on Mars - The Mars Science Laboratory Radiation Assessment Detector MSL/RAD Measuring Neutrons and Gamma Rays on Mars - The Mars Science Laboratory Radiation Assessment Detector MSL/RAD

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufm.p51a1412w&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #P51A-1412

Astronomy and Astrophysics

Astrophysics

[0994] Exploration Geophysics / Instruments And Techniques, [5200] Planetary Sciences: Astrobiology, [6225] Planetary Sciences: Solar System Objects / Mars, [7500] Solar Physics, Astrophysics, And Astronomy

Scientific paper

The Mars Science Laboratory (MSL) missions Radiation Assessment Detector (RAD) will measure the radiation environment on the Martian surface. One of the difficult measurements is that of the neutral radiation component consisting of neutrons and gamma rays. Different from Earth, this neutral component contributes substantially to the total dose on the planetary surface, principally because the Martian atmosphere is so thin. The RAD instrument is capable of measuring neutral particles through a combination of sensitive anti-coincidence and organic and inorganic scintillator materials. In this work, we will explain how RAD will measure the neutral particle radiation on Mars and compare with calibration results. The problem of inverting measured neutron and gamma data is a non-trivial task. For all inversions, one generally assumes that the measurement process can be described by a system of linear equations, A ěc{f} = ěc{z}, where the matrix A describes the instrument response function (IRF), ěc{f} the underlying, but unknown, ``real'' physical parameters, and ěc{z} the measured data. The inversion of this deceptively simple-looking set of equations is in fact a key example of an ill-posed or inverse problem. Such problems are notoriously difficult to solve.

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