An MOS Dosimeter for Use in Space

This paper describes a four-sensor, integrating dosimeter that is designed for use aboard earth-orbiting satellites. The radiation-detecting sensors utilized are radiation-soft, PMOS transistors. The dosimetric parameter employed is the shift in threshold voltage, ΔVT. This voltage shift is related...

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Published inIEEE transactions on nuclear science Vol. 30; no. 1; pp. 508 - 511
Main Authors August, L. S., Circle, R. R., Ritter, J. C., Tobin, J. S.
Format Journal Article
LanguageEnglish
Published IEEE 01.02.1983
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Abstract This paper describes a four-sensor, integrating dosimeter that is designed for use aboard earth-orbiting satellites. The radiation-detecting sensors utilized are radiation-soft, PMOS transistors. The dosimetric parameter employed is the shift in threshold voltage, ΔVT. This voltage shift is related to the dose absorbed, D, in the SiO2 film of the transistor. The relationship between ΔVT and D is determined with a calibrated Co-60 gamma-ray source. The design of the dosimeter minimizes the differences in charge recombination between the calibrating radiation, Co-60 gamma rays, and the space radiation environment, which consists mostly of energetic electrons and protons. Each of the four transistors that are incorporated into the Spacecraft MOS Dosimeter is beneath a different thickness of aluminum in order to obtain depth-dose information. The circuit that applies the required biases to the transistor gates and also provides the needed analog voltage data to the spacecraft telemetry system consists mostly of radiation-hard operational amplifiers and stable, precision resistors. This circuit has been tested to 150 krad with 7-MeV electrons, and there was no observable degradation in performance.
AbstractList This paper describes a four-sensor, integrating dosimeter that is designed for use aboard earth-orbiting satellites. The radiation-detecting sensors utilized are radiation-soft, PMOS transistors. The dosimetric parameter employed is the shift in threshold voltage, ΔVT. This voltage shift is related to the dose absorbed, D, in the SiO2 film of the transistor. The relationship between ΔVT and D is determined with a calibrated Co-60 gamma-ray source. The design of the dosimeter minimizes the differences in charge recombination between the calibrating radiation, Co-60 gamma rays, and the space radiation environment, which consists mostly of energetic electrons and protons. Each of the four transistors that are incorporated into the Spacecraft MOS Dosimeter is beneath a different thickness of aluminum in order to obtain depth-dose information. The circuit that applies the required biases to the transistor gates and also provides the needed analog voltage data to the spacecraft telemetry system consists mostly of radiation-hard operational amplifiers and stable, precision resistors. This circuit has been tested to 150 krad with 7-MeV electrons, and there was no observable degradation in performance.
A p-channel metal oxide semiconductor (PMOS) FET for dosimetry on board satellites is described as part of a four-transistor package forming a spacecraft MOS dosimeter (SMD). The PMOS FETs are radiation soft, which produces a dosimetric parameter defined as the shift in the threshold voltage. The dosage is absorbed by an SiO2 film. The relationship between the threshold voltage shift and the dosage is calibrated using a Co-60 gamma ray source. Implantation of the four MSD units in varying thicknesses of aluminum permits a depth-dose analysis. Performance of the circuit has remained steady under bombardment with 7 MeV electrons up to a 150 krad dosage.
Author August, L. S.
Circle, R. R.
Tobin, J. S.
Ritter, J. C.
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Snippet This paper describes a four-sensor, integrating dosimeter that is designed for use aboard earth-orbiting satellites. The radiation-detecting sensors utilized...
A p-channel metal oxide semiconductor (PMOS) FET for dosimetry on board satellites is described as part of a four-transistor package forming a spacecraft MOS...
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StartPage 508
SubjectTerms Circuit testing
Electrons
Gamma rays
MOSFETs
Protons
Satellites
Space charge
Space vehicles
Spontaneous emission
Threshold voltage
Title An MOS Dosimeter for Use in Space
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