Temperature measurement sensor using material with a temperature dependent neutron capture cross section

A temperature measurement sensor for use in a nuclear reactor comprising:

• a first neutron detector member;
• and
• a second neutron detector member;
• each of the first and second neutron detector members being comprised of an inner electron emitter, a first layer of insulation surrounding the emitter, a charge collector surrounding the first layer of insulation, a negative charge output pin extending outwardly from the charge collector, and a positive charge output pin extending outwardly from the emitter;
• the first neutron detector member further comprising a second layer of insulation surrounding the first neutron detector charge collector, an electron absorbing layer surrounding the second layer of insulation and an outer shield for capturing neutrons surrounding the electron absorbing layer;
• wherein in use, the first neutron detector member outputs a first current signal and the second neutron detector member outputs a second current signal;
• an electrical connection between the first and second current signals capable of calculating the difference in current between the first and second signals, wherein the difference is proportional to changes in temperature.