Abstract
A quartz fiber electrometer (QFE) dosimeter system has been designed, developed, and tested to demonstrate the applicability of small dosimeters of the Neher type for use as space qualified instruments. The electrometer consists of a 3 mm diam×30 mm cylindrical quartz rod partially coated with Au, and a 10 μ diam quartz fiber coated with Signa-Kote to a resistance between 0.25 and 1.5 MΩ/cm. The 9 cm3 tissue equivalent ionization chamber is filled with 1 atm of C2H4, and consists of the automatic recycling QFE inside a 112 mg/cm2 Signa-Kote coated Delrin electrode and a 103 mg/cm2 Al case. Eight design verification units with various electrometer properties were subjected to tests involving calibration with 60Co for five decades of dose rate, temperature variation from −40 to +82°C, simulated mission vibration and shock, orientation in the earth's gravity field, and gas leakage. The performance of the instruments indicates that they can indeed be developed into meritorious space qualified radiation dosimeters.
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