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Abstract:
Today, aircraft flights are
carried out over very long distances and at very high altitudes. However, at
very high altitudes and at higher or lower latitudes, the environmental threat
associated with cosmic radiation becomes more acute and therefore the risks to
equipment become greater.
In order to assess the impact of cosmic rays on systems
during aircraft flights and therefore the risks for aircraft safety, it then
becomes necessary to quantify the presence of these cosmic rays and their
effects at high flight altitudes of aircraft.
To this end, Bombardier Aerospace and its partners have
launched measurement campaigns on board aircraft flying at different latitudes
at high altitudes. A plastic scintillator has been used to measure cosmic ray
particles to build up a consistent database of real data. However, the
measurements recorded by this scintillator must be converted into spectra,
which can be used to assess the effects of cosmic radiation on electronic
modules. Thus, for the work exposed in this paper, we have selected and used
the Gravel algorithm to transform the measured data into gamma rays and
electrons spectrum energy.
The accuracy of the energy fluence for many points of
the flight path is assessed by comparing the effective dose calculations from
the measurements and those using the following tool: based on excel programs
for the calculation of atmospheric cosmic ray spectrum (EXPACS). The rate
differences between these doses for altitudes above 6 km do not exceed 19%,
these ones are acceptable in spectroscopy.
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