Space charge dosimeters for extremely low power measurements of radiation in shipping containers
First Claim
1. An apparatus, comprising:
- a first insulated gate field effect transistor including a first source, a first drain and a first insulated gate;
a second insulated gate field effect transistor including a second source, a second drain and a second insulated gate, the second source coupled to the first source;
a first conductor coupled to the second gate;
a first active region connected to the first conductor, the first active region accumulating dosimetric data from incident ionizing radiation;
a second conductor connected to the first active region;
a second active region coupled to the second conductor, the second active region accumulating dosimetric data from incident ionizing radiation; and
a third conductor coupled between the second active region and the first gate,wherein the second conductor is coupled to both the first source and the second source.
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Abstract
Methods and apparatus are described for space charge dosimeters for extremely low power measurements of radiation in shipping containers. A method includes insitu polling a suite of passive integrating ionizing radiation sensors including reading-out dosimetric data from a first passive integrating ionizing radiation sensor and a second passive integrating ionizing radiation sensor, where the first passive integrating ionizing radiation sensor and the second passive integrating ionizing radiation sensor remain situated where the dosimetric data was integrated while reading-out. Another method includes arranging a plurality of ionizing radiation sensors in a spatially dispersed array; determining a relative position of each of the plurality of ionizing radiation sensors to define a volume of interest; collecting ionizing radiation data from at least a subset of the plurality of ionizing radiation sensors; and triggering an alarm condition when a dose level of an ionizing radiation source is calculated to exceed a threshold.
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Citations
2 Claims
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1. An apparatus, comprising:
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a first insulated gate field effect transistor including a first source, a first drain and a first insulated gate; a second insulated gate field effect transistor including a second source, a second drain and a second insulated gate, the second source coupled to the first source; a first conductor coupled to the second gate; a first active region connected to the first conductor, the first active region accumulating dosimetric data from incident ionizing radiation; a second conductor connected to the first active region; a second active region coupled to the second conductor, the second active region accumulating dosimetric data from incident ionizing radiation; and a third conductor coupled between the second active region and the first gate, wherein the second conductor is coupled to both the first source and the second source. - View Dependent Claims (2)
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Specification
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- Resources
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Current AssigneeUT-Battelle LLC
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Original AssigneeUT-Battelle LLC
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InventorsHanson, Gregory R., Buckner, Mark A., Britton, Charles L. Jr., Bryan, William L.
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Primary Examiner(s)Lieu; Julie
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Application NumberUS12/406,680Publication NumberTime in Patent Office776 DaysField of SearchNoneUS Class Current340/572.1CPC Class CodesG06Q 10/08 Logistics, e.g. warehousing...G08B 13/2462 Asset location systems comb...G08B 21/12 responsive to undesired emi...H01L 2924/00 Indexing scheme for arrange...H01L 2924/0002 Not covered by any one of g...
