3He proportional neutron counters (helium-3 gas filled tubes) are currently the most sensitive type of neutron detectors. These detectors owe their high sensitivity to thermal neutrons to the exceptionally high probability of thermal neutron capture by helium-3 atoms (technically speaking, ... Read More

To better study the neutron flux originating from my bubble fusion reactor I decided to employ an additional LND 25169 neutron detector to supplement my 6x LND 251106 neutron detector bank. The LND 25169 detector has two unique features compared ... Read More

SNMO-5 is a neutron detector (proportional counter) filled with boron trifluoride enriched with boron-10 - Fig. 1. The tube is 10.5" long and has a diameter of 1.375". These dimensions are comparable to the size of helium-3 filled SNM-18 tube. ... Read More

Helium-3 proportional counters are generally used to detect thermal neutrons and therefore produce thermal neutron spectrum, which looks the same regardless of the energy of the neutron source. Obviously, in order to detect thermal neutrons fast neutrons first must be ... Read More