Space charge dosimeters for extremely low power measurements of radiation in shipping containers
First Claim
1. A method, comprising in situ 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,wherein 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 dosimetric data andwherein the first passive integrating radiation sensor and the second passive integrating radiation sensor are connected to read-out circuits, the read-out circuits presenting extremely high impedance while in a passive integration mode and while in an active read-out mode without destruction of integrated dosimetric data, thereby allowing continuous integration of ionizing radiation to a maximum extent of the first passive integrating ionizing radiation sensor and the second passive integrating ionizing radiation sensor, andwherein the read-out circuits present impedance of from approximately 1011 ohms to approximately 1015 ohms.
1 Assignment
0 Petitions
Accused Products
Abstract
Methods and apparatus are described for space charge dosimeters for extremely low power measurements of radiation in shipping containers. A method includes in situ 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.
-
Citations
8 Claims
-
1. A method, comprising in situ 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,
wherein 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 dosimetric data and wherein the first passive integrating radiation sensor and the second passive integrating radiation sensor are connected to read-out circuits, the read-out circuits presenting extremely high impedance while in a passive integration mode and while in an active read-out mode without destruction of integrated dosimetric data, thereby allowing continuous integration of ionizing radiation to a maximum extent of the first passive integrating ionizing radiation sensor and the second passive integrating ionizing radiation sensor, and wherein the read-out circuits present impedance of from approximately 1011 ohms to approximately 1015 ohms.
-
2. A method, comprising in situ 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,
wherein 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, wherein the first passive integrating radiation sensor and the second passive integrating radiation sensor are connected to read-out circuits presenting extremely high impedance while in passive integration mode and during active read-out of dosimetric data without destruction of integrated dosimetric data, thereby allowing continuous integration of ionizing radiation to the maximum extent of the sensors and, upon sensing the attainment of maximum integration limits, readout circuits will reset passive integrating radiation sensors and accumulate in a non-volatile manner the number of sensor reset cycles, and wherein the read-out circuits present impedance of from approximately 1011 ohms to approximately 1015 ohms.
-
3. An apparatus comprising:
-
a first passive integrating ionizing radiation sensor; a second passive integrating ionizing radiation sensor; a read-out circuit coupled to both the first passive integrating ionizing radiation sensor and the second passive integrating ionizing radiation sensor, the read-out circuit presenting an extremely high impedance to both the first passive integrating ionizing radiation sensor and the second passive integrating ionizing radiation sensor both while the read-out circuit is in a passive integration mode and while the read-out circuit is in an active read-out mode; and a communication circuit coupled to the read-out circuit, wherein read-out dosimetric data from both the first passive integrating radiation sensor and the second passive integrating radiation sensor is presented to the communications circuit, and wherein the read-out circuits present impedance of from approximately 1011 ohms to approximately 1015 ohms. - View Dependent Claims (4)
-
-
5. An apparatus, comprising:
-
a thick oxide dosimeter; and a readout circuit coupled to the thick oxide dosimeter, wherein both the thick oxide dosimeter and the readout circuit are constructed on a single high impedance and low leakage substrate. - View Dependent Claims (6, 7, 8)
-
Specification