The dynamic method for time-of-flight measurement of thermal neutron spectra from pulsed sources

A time-of-flight method for measurement of thermal neutron spectra in pulsed neutron sources with an efficiency more than 105 times higher than the standard method is described. The main problems associated with the electric current technique for time-of-flight spectra measurement are examined. The methodical errors, problems of special neutron detector design and other questions are discussed. Some experimental results for spectra from the surfaces of water and solid methane moderators obtained at the IBR-2 pulsed reactor (Dubna, Russia) are presented.