Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984itns...31..801a&link_type=abstract
(IEEE, NASA, U.S. Department of Energy, et al., Nuclear Science Symposium, 30th, San Francisco, CA, Oct. 19-21, 1983) IEEE Trans
Astronomy and Astrophysics
Astronomy
12
Dosimeters, Metal Oxide Semiconductors, Radiation Dosage, Radiation Hardening, Satellite-Borne Instruments, Spaceborne Astronomy, Cobalt 60, Criteria, Design Analysis, Field Effect Transistors, Gamma Rays
Scientific paper
Data leading to useful design criteria for extending the dose of a PMOS dosimeter into the megarad range are presented. A collimated high specific-activity Co-60 gamma source is utilized, and the dose rate is determined using CaF2:Mn TLDs and precise time measurements. In order to get the necessary high dose rate, the irradiations of the PMOS transistors are done inside of the collimator next to the cobalt pellet when the source is activated. Reasonably accurate relative results are obtained for a comparison of the two operating modes of the PMOS transistors. With a high positive gate bias during irradiation, the transistors are useful to about 50 krad. When the source, drain, and gate are grounded during irradiation the devices are usable up to about 2.5 Mrad.
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