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

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.
Inventors:
; ; ;
Issue Date:
OSTI Identifier:
1176469
Assignee:
GE-Hitachi Nuclear Energy Americas LLC (Wilmington, NC) OSTI
Patent Number(s):
8,238,509
Application Number:
12/557,631
Contract Number:
FC07-07ID14778
Research Org:
GE-Hitachi Nuclear Energy Americas LLC, Wilmington, NC (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY