Method for gain matching neutron detectors containing various He—3 partial pressures

An arrangement for detecting neutrons, the arrangement comprising:

• a first neutron detector comprising a first amount of helium, the first amount of helium including a first amount of Helium-3;
• and
• a second neutron detector comprising a second amount of helium, the second amount of helium including a second amount of Helium-3, and at least some Boron-10;
• wherein the first amount of Helium-3 is different from the second amount of Helium-3, and wherein the first amount of helium is equal to the second amount of helium.

An arrangement for detecting neutrons, the arrangement comprising:

• a first neutron detector comprising at least some helium;
• and
• a second neutron detector comprising at least some helium and at least some Boron-10;
• wherein the first neutron detector has an associated gain performance, the second neutron detector has an associated gain performance, and the gain performance of the second neutron detector matches the gain performance of the first neutron detector.