Method and system for determining depth distribution of radiation-emitting material located in a source medium and radiation detector system for use therein

• US 6,727,505 B2
• Filed: 11/19/2002
• Issued: 04/27/2004
• Est. Priority Date: 04/16/1999
• Status: Expired due to Fees

• Current Assignee: Board of Regents of the University of Michigan (University of Michigan)
• Original Assignee: Board of Regents of the University of Michigan (University of Michigan)
• Inventors: McGregor, Douglas S., Kearfott, Kimberlee J., Benke, Roland R.
• Primary Examiner(s): Hannaher, Constantine
• Assistant Examiner(s): Gabor, Otilia
• Application Number:
  US10/299,447
• Publication Number:
  US 20030136916A1
• Time in Patent Office: 525 Days
• Field of Search: 250/393, 250/394, 250/370.01, 250/370.13, 250/370.07, 250/363.1, 250/363.04, 250/358.1, 250/253
• US Class Current: 250/393
• CPC Class Codes: G01V 5/02 specially adapted for surface logging, e.g. from aircraft

Abstract

A radiation detector system includes detectors having different properties (sensitivity, energy resolution) which are combined so that excellent spectral information may be obtained along with good determinations of the radiation field as a function of position.

Claims

1. A radiation detector system comprising:

at least one central radiation detector for converting ionizing radiation into a first signal;

a plurality of separate satellite radiation detector detectors positioned adjacent to and surrounding the at least one central radiation detector for converting ionizing radiation into a plurality of second signals, each of the satellite radiation detectors having a field of view different than fields of view of the other satellite radiation detectors; and

a plurality of radiation shields, wherein a radiation shield is disposed between each pair of adjacent satellite radiation detectors to substantially block ionizing radiation originating outside the field of view of each satellite radiation detector wherein the first signal and the second signals represent a spectral fingerprint of an area and spatial distribution of an ionizing radiation source within the area.

2. The system as claimed in claim 1 wherein each of satellite radiation detectors is a spectroscopic radiation detector.

3. The system as claimed in claim 1, wherein the ionizing radiation includes gamma rays and wherein the system is a position-sensitive, compound gamma ray spectrometer.

4. The system as claimed in claim 1 wherein the at least one central radiation detector includes a semiconductor substrate.

5. The system as claimed in claim 1 wherein each of the satellite detectors is a positional detector.