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Space charge dosimeters for extremely low power measurements of radiation in shipping containers

  • US 7,932,828 B2
  • Filed: 03/18/2009
  • Issued: 04/26/2011
  • Est. Priority Date: 05/06/2004
  • Status: Expired due to Fees
First Claim
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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.

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