Measurements of radiation in space, cosmic rays and Solar energetic particles, date back to the dawn of space flight.
Solid state detectors, the basis of most modern high energy charged particle instruments, first flew in space in the
1960's. Modern particle spectrometers, such as ACE/CRIS, ACE/SIS and Ulysses/HET, can measure the elemental and
isotopic composition of ions through the iron peak. This is achieved by using position sensing detectors (PSD's)
arranged into hodoscopes to measure particle trajectories through the instrument, allowing for pathlength corrections to
energy loss measurements. The Angle Detecting Inclined Sensor (ADIS) technique measures particle angle of incidence
using a simple system of detectors inclined to the instrument axis. It achieves elemental resolution well beyond iron, and
isotopic resolution for moderate mass elements without the complexity of position sensing detectors. An ADIS
instrument was selected to fly as the High Energy Particle Sensor (HEPS) on NPOESS, but was de-scoped with the rest
of the space weather suite. Another ADIS instrument, the Energetic Heavy Ion Sensor (EHIS), is being developed for
GOES-R. UNH has built and tested a engineering unit of the EHIS. Applications for manned dosimetery on the Crew
Exploration Vehicle (CEV) are also being explored. The basic ADIS technique is explained and accelerator data for
heavy ions shown.