Method for determining total ionizing dose with spherical model
AssigneeRaytheon Company
InventorSteven J. Manson
Life of this patent
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Abstract
A system for generating a radiation transport model includes a memory and a processor configured to generate a histogram of areal density measurements that are measured by directional sampling of a CAD model. The histogram bins are mapped to a spherical model comprising longitudinal wedges, where respective wedges have an areal density value derived from the histogram bins, and an azimuthal angular extent given by the respective bins of the histogram. The spherical model can be used to determine a total ionization dose for an electronic component positioned at the location of the CAD model. The total ionization dose can be used to adjust shielding material in the CAD model.
Claims20
A system for generating a radiation transport model, the system comprising:
- a memory;
- and
- a processor configured to:
- generate a histogram of areal density measurements that are measured by directional sampling of a computer-aided design (CAD) model;
- map respective bins of the histogram to respective angular extents that are proportional to a number of measurements in the respective bins;
- generate a spherical model comprising a plurality of longitudinal wedges, each longitudinal wedge having:
- an areal density value derived from respective bins of the histogram;
- and
- an azimuthal angular extent given by the respective bins of the histogram mapped to the respective angular extents;
- determine a total ionization dose (TID) using the spherical model as the radiation transport model, the TID determined for a representative element positioned at a center of the spherical model;
- wherein the memory is configured to store the TID.
A non-transitory computer-readable storage device that stores instructions for execution by one or more processors configured to generate a radiation transport model, wherein the processors are configured to:
- generate a histogram of areal density measurements that are measured by directional sampling of a computer-aided design (CAD) model;
- map respective bins of the histogram to respective angular extents that are proportional to a number of measurements in the respective bins;
- generate a spherical model comprising a plurality of longitudinal wedges, each longitudinal wedge having:
- an areal density value derived from respective bins of the histogram;
- and
- an azimuthal angular extent given by the respective bins of the histogram mapped to the respective angular extents;
- and
- determine a total ionization dose (TID) using the spherical model as the radiation transport model, the TID determined for a silicon witness positioned at a center of the spherical model.
A method for generating a radiation transport model, the method comprising:
- generating a histogram of areal density measurements that are measured by raytracing from a central point of a computer-aided design (CAD) model, the central point corresponding to a position of an electronic component;
- wherein the raytracing comprises a plurality of vectors that encounter one or more surfaces of the CAD model, wherein the raytracing registers at least one or more of:
- a material type of a solid bounded by a subset of the one or more surfaces;
- a material property of the solid;
- a first intersection of the vector with a first surface in the one or more surfaces representing an entry location of the vector to the solid;
- a second intersection of the vector with a second surface in the one or more surfaces representing an exit location of the vector from the solid;
- a path length of the vector through the solid;
- or any combination thereof;
- mapping respective bins of the histogram to respective angular extents that are proportional to a number of measurements in the respective bins;
- generating a spherical model comprising a plurality of longitudinal wedges, each longitudinal wedge having:
- an areal density value derived from respective bins of the histogram;
- and
- an azimuthal angular extent given by the respective bins of the histogram mapped to the respective angular extents;
- and
- determining a total ionization dose (TID) using the spherical model as the radiation transport model in a radiation transport simulation that applies effects of particle interactions to simulate passage of particles or radiation through the spherical model;
- wherein the radiation transport simulation includes radiation sources having a specified energy or range of energies, the radiation sources comprising at least one of neutrons;
- photons;
- electrons;
- protons;
- ions;
- additional elementary particles;
- or a combination thereof, the TID determined for a representative element positioned at a center of the spherical model.
Dependencies are inferred from the claim text.