Instrument Overview
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Using five different types of telescopes, the trapped radiation detector was designed to provide basic information about several of the fundamental features of Jupiter's radiation belts including the types of particles within the belts, their distribution, energy, andintensity.

An unfocused Cerenkov counter detected the light emitted in a particular direction as particles passed through it. It recorded electrons of energy 0.5 to 12 MeV. An electron scatter detector was activated by electrons at 100 to 400 keV. A minimum ionizing detector, consisting of a solid-state diode, measured minimum ionizing particles (i.e., less than 3 MeV) and protons in the range of 50 to 350 MeV. Finally, two scintillation detectors distinguished roughly between electrons of less than 5 and protons of less than50 keV.

['Instrument Overview' was adapted from FIMMELETAL pp. 53-54.]