DESCRIPTION
The Micro Dosimeter (P/N UDOS001) is a compact hybrid microcircuit
which directly measures total ionizing dose (TID) absorbed by an
internal silicon test mass. The test mass simulates silicon die of
integrated circuits on-board a host spacecraft in critical mission
payloads and subsystems. By accurately measuring the energy
absorbed from electrons, protons, and gamma rays, an estimate of
the dose absorbed by other electronic devices on the same vehicle
can be made. The Micro Dosimeter can operate from a wide range
of power supply voltages. The accumulated dose is presented to
three cascaded dc linear outputs and one pseudo-logarithmic output
giving a dose resolution of 14 μrad(Si) and a measurement
range up to 40 krad(Si). These outputs are intended to
be directly connected to most analog-to-digital converters (ADCs)
or spacecraft housekeeping analog inputs (0-5V range), which
makes minimal demands on the host vehicle.

FEATURES/BENEFITS
• Enables routine monitoring of spacecraft radiation environment
• Custom microchip in a small footprint package which results in
significantly lower weight and power than alternative devices
• Can be mounted in multiple locations on spacecraft
• Correlates environmental models and ray-tracing analyses with
real in-flight measurements
• Provides total mission dose to aid in diagnosis of spacecraft
anomalies that result from changes in environmental fluxes
• Dosimeters can be integrated to standard spacecraft
housekeeping systems
• Measures up to 40 krad(Si)
• Mechanical dimensions: 1.4” x 1.0” x 0.040”
• 20 grams in weight
• 10 mA from 13 Vdc to 40 Vdc input
• Simple linear analog output
• Commercial Class H-equivalent screening available