Library generation for detection and identification of shielded radioisotopes
First Claim
1. A method for determining and indicating the presence of a radioisotope threat, the method comprising:
- at a computer device, receiving spectral data associated with a region or space captured by a detector for detecting radioisotopes;
adjusting the captured spectral data by quantum efficiency values of a quantum efficiency value matrix based on the detector;
comparing the adjusted spectral data with library stored spectral data, the library stored spectral data being created by;
grouping possible materials with which a radioisotope interacts into one of a plurality of material groups;
subdividing each of the plurality of material groups into a plurality of subgroups based on atomic number and/or electron affinity of a material;
generating first data for each of the subgroups of each of the plurality of material groups, wherein the first data comprises a plurality of values each represents an interaction between a selected representative material for a corresponding subgroup and radiation at one of a plurality of energy levels;
generating second data representing spectral characteristics of each radioisotope of interest at the plurality of energy levels; and
for each radioisotope of interest, computing spectrum data representing an interaction between the radioisotope of interest using the second data with the first data for each of the plurality of subgroups in each material group to create library stored spectral data to be stored in a library; and
based on the comparison, generating either a signal indicating a threat or generating a signal indicating a non-threat.
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Accused Products
Abstract
A method, logic and system are provided for generating data representing all possible materials that may be present when monitoring a region or space for a radioisotope of interest. All possible materials with which a radioisotope material may interact are grouped or categorized into one of a plurality of material groups. Each material group is further subdivided into a plurality of subgroups based on atomic number of a material. First data is stored for each of the subgroups of each of the plurality of material groups, where the first data represents an interaction between a representative material for a corresponding subgroup and radiation at a plurality of energy levels. Second data is stored representing spectral characteristics of each radioisotope of interest at the plurality of energy levels. For a radioisotope of interest, a computation is made to produce spectrum data resulting from an interaction between of the radioisotope of interest using the second data with the first data for each of the plurality of subgroups in each material group. The spectrum data is then stored in a library for later use in the field with the output from a detector. Spectrum data is stored for the particular detector to be used in the field, and to this end, such detector-specific spectrum library data may be adjusted to account for a detector'"'"'s quantum efficiency and resolution characteristics.
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Citations
25 Claims
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1. A method for determining and indicating the presence of a radioisotope threat, the method comprising:
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at a computer device, receiving spectral data associated with a region or space captured by a detector for detecting radioisotopes; adjusting the captured spectral data by quantum efficiency values of a quantum efficiency value matrix based on the detector; comparing the adjusted spectral data with library stored spectral data, the library stored spectral data being created by; grouping possible materials with which a radioisotope interacts into one of a plurality of material groups; subdividing each of the plurality of material groups into a plurality of subgroups based on atomic number and/or electron affinity of a material; generating first data for each of the subgroups of each of the plurality of material groups, wherein the first data comprises a plurality of values each represents an interaction between a selected representative material for a corresponding subgroup and radiation at one of a plurality of energy levels; generating second data representing spectral characteristics of each radioisotope of interest at the plurality of energy levels; and for each radioisotope of interest, computing spectrum data representing an interaction between the radioisotope of interest using the second data with the first data for each of the plurality of subgroups in each material group to create library stored spectral data to be stored in a library; and based on the comparison, generating either a signal indicating a threat or generating a signal indicating a non-threat. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. One or more non-transitory processor-readable media encoded with instructions to determine and indicate presence of a radioisotope threat that, when executed by a processor, cause the processor to:
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receive spectral data associated with a region or space captured by a detector for detecting radioisotopes; adjust the captured spectral data by quantum efficiency values of a quantum efficiency value matrix based on the detector; compare the adjusted spectral data with library stored spectral data, the library stored spectral data being created by; grouping possible materials with which a radioisotope interacts into one of a plurality of material groups; subdividing each of the plurality of material groups into a plurality of subgroups based on atomic number and/or electron affinity of a material; generating first data for each of the subgroups of each of the plurality of material groups, wherein the first data comprises a plurality of values each represents an interaction between a selected representative material for a corresponding subgroup and radiation at one of a plurality of energy levels; generating second data representing spectral characteristics of each radioisotope of interest at the plurality of energy levels; and for each radioisotope of interest, computing spectrum data representing an interaction between the radioisotope of interest using the second data with the first data for each of the plurality of subgroups in each material group to create library stored spectral data to be stored in a library; and based on the comparison, generate either a signal indicating a threat or generating a signal indicating a non-threat. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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21. A system for determining and indicating the presence of a radioisotope threat, comprising:
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a memory storing computer executable instructions; and a computer processor coupled to the memory and configured to execute the computer executable instructions to; adjust the captured spectral data by quantum efficiency values of a quantum efficiency value matrix based on the detector; compare the adjusted spectral data with library stored spectral data, the library stored spectral data being created by; grouping possible materials with which a radioisotope interacts into one of a plurality of material groups; subdividing each of the plurality of material groups into a plurality of subgroups based on atomic number and/or electron affinity of a material; generating first data for each of the subgroups of each of the plurality of material groups, wherein the first data comprises a plurality of values each represents an interaction between a selected representative material for a corresponding subgroup and radiation at one of a plurality of energy levels; generating second data representing spectral characteristics of each radioisotope of interest at the plurality of energy levels; and for each radioisotope of interest, computing spectrum data representing an interaction between the radioisotope of interest using the second data with the first data for each of the plurality of subgroups in each material group to create library stored spectral data to be stored in a library; and based on the comparison, generate either a signal indicating a threat or generating a signal indicating a non-threat. - View Dependent Claims (22, 23, 24, 25)
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Specification