Data reduction system for real time monitoring of radiation machinery
AssigneeTrygon, Inc.
InventorsSamuel V. Nablo, David R. Kneeland
Life of this patent
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Abstract
A data reduction system for real time monitoring of radiation machinery measures the bremsstrahlung flux produced by the electron beam used to generate the desired radiation, and then corrects the measurement by corrective signals derived from the determination of other parameters, such as the energy of the electrons, the velocity of the product irradiated, the temperature of the device which measures the flux, and differences in sensitivity between a plurality of devices which measure the spacial and temporal distribution of the flux.
Claims22
Apparatus for measuring properties of an electron beam, for use in electron processing of matter and in x-ray generation wherein said electron beam is directed at a product plane, comprising at least one radiation detector for measuring the bremsstrahlung flux at the position of the detector and for generating a flux signal indicating said flux, means for determining the energy of the electrons in said electron beam and for generating an energy signal indicating said energy, means including said energy signal for correcting said flux signal so that the corrected flux signal, when multiplied by a signal proportional to the residence time of a product in the beam, will be a measure of the dose delivered by the electron beam at the product plane, means for generating a residence signal proportional to the residence time of the product in the beam, and means for multiplying said corrected flux signal by said residence signal.
Method of measuring properties of an electron beam in an electron processor system, comprising the steps of measuring the bremsstrahlung flux at a known position and generating a flux signal indicating said flux, determining the energy of the electrons in said electron beam and generating an energy signal indicating said energy, and using said energy signal to correct said flux signal so that the corrected flux signal is proportional to the electron beam current density and is essentially unaffected by variations in energy of the electrons in said electron beam.
Method of warning if positive ion effects due to vacuum system leakage are serious during irradiation of a product by radiation produced by an electron beam, comprising the following steps:
- measuring the bremsstrahlung flux at a known position, generating a flux signal indicating said flux, determining the electron current in said electron beam, generating an electron current signal indicating said electron current, and using the ratio of said flux signal to said electron current signal to monitor said positive ion effects.
Dependencies are inferred from the claim text.