Characterization of cosmic rays and direction dependence in the Polar Region up to 88 km altitude | Journal of Space Weather and Space Climate

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Table 2.

The threshold energies of the REM-RED GM measurements.

Component	Lowest energy threshold
Component	2 g cm⁻² Al equivalent shielding	4 g cm⁻² Al equivalent shielding
Photons^* (keV)	10	25
Protons (MeV)	20	50
Alpha particles (MeV)	130	200

Corresponding to 10th-value thickness.

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