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Neutron monitoring systems including gamma thermometers and methods of calibrating nuclear instruments using gamma thermometers

United States Patent

August 7, 2012
View the Complete Patent at the US Patent & Trademark Office
U.S. Department of Energy - Visit the Office of the Assistant General Counsel for Technology Transfer & Intellectual Property Website
A method of calibrating a nuclear instrument using a gamma thermometer may include: measuring, in the instrument, local neutron flux; generating, from the instrument, a first signal proportional to the neutron flux; measuring, in the gamma thermometer, local gamma flux; generating, from the gamma thermometer, a second signal proportional to the gamma flux; compensating the second signal; and calibrating a gain of the instrument based on the compensated second signal. Compensating the second signal may include: calculating selected yield fractions for specific groups of delayed gamma sources; calculating time constants for the specific groups; calculating a third signal that corresponds to delayed local gamma flux based on the selected yield fractions and time constants; and calculating the compensated second signal by subtracting the third signal from the second signal. The specific groups may have decay time constants greater than 5.times.10.sup.-1 seconds and less than 5.times.10.sup.5 seconds.
Moen; Stephan Craig (Wilmington, NC), Meyers; Craig Glenn (Salem, VA), Petzen; John Alexander (Roanoke, VA), Foard; Adam Muhling (Christianburg, VA)
GE-Hitachi Nuclear Energy Americas LLC (Wilmington, NC)
12/ 557,631
September 11, 2009
GOVERNMENT SUPPORT This invention was made with Government support under contract number DE-FC07-07ID14778, awarded by the U.S. Department of Energy. The United States Government has certain rights in the invention.