Design criteria for a high-dose MOS dosimeter for use in space
In a previous paper a small, light-weight, low-power integrating dosimeter is described that is designed for use aboard satellites where the expected total dose is below 30 krad. The radiation-detecting sensors employed are radiation-soft, PMOS transistors. The dosimetric parameter utilized is the shift in threshold voltage, ..delta..V/SUB T/. This voltage shift is related to the radiation dose absorbed, D, in the SiO/sub 2/ gate oxide of the transistor. The relationship between ..delta..V/SUB T/ and D is determined with a calibrated Co-60 gamma-ray source. The present paper gives experimental results from which design criteria are derived that will extend the use of the dosimeter into the megarad range. The data show that the existing PMOS transistors can be operated in either of two ways. With a high positive gate bias during irradiation, and with some circuit modification, the PMOS transistors are useful up to about 50 krad. When the source, drain, and gate are grounded during irradiation, and subsequently read out normally, the devices are usable up to approximately 2.5 Mrad. The underlying device physics for these two modes of operation is discussed.
- Research Organization:
- Naval Research Lab., Washington, DC 20375
- OSTI ID:
- 6677396
- Report Number(s):
- CONF-831015-; TRN: 84-016493
- Journal Information:
- IEEE Trans. Nucl. Sci.; (United States), Vol. 31:1; Conference: Nuclear science symposium, San Francisco, CA, USA, 19 Oct 1983
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
DOSEMETERS
CALIBRATION
DESIGN
OPERATION
SI SEMICONDUCTOR DETECTORS
COBALT 60
COSMIC GAMMA SOURCES
ELECTRIC POTENTIAL
ENERGY ABSORPTION
EXPERIMENTAL DATA
MOS TRANSISTORS
PHASE SHIFT
RADIATION DOSES
SATELLITES
SILICON OXIDES
ABSORPTION
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHALCOGENIDES
COBALT ISOTOPES
COSMIC RAY SOURCES
DATA
DOSES
INFORMATION
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MEASURING INSTRUMENTS
MINUTES LIVING RADIOISOTOPES
NUCLEI
NUMERICAL DATA
ODD-ODD NUCLEI
OXIDES
OXYGEN COMPOUNDS
RADIATION DETECTORS
RADIOISOTOPES
SEMICONDUCTOR DETECTORS
SEMICONDUCTOR DEVICES
SILICON COMPOUNDS
TRANSISTORS
YEARS LIVING RADIOISOTOPES
440101* - Radiation Instrumentation- General Detectors or Monitors & Radiometric Instruments