An improved long counter for neutron fluence measurement with a flat response over a wide energy range from 1 keV to 15 MeV

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 768; pp. 43 - 45
• Main Authors: Hu, Q.Y., Zhang, J.H., Zhang, D., Guo, H.S., Yang, G.Z., Li, B.J., Ye, F., Si, F.N., Liu, J., Fu, Y.C., Ning, J.M., Yang, J., Yang, H.H., Wang, W.C.
• Format: Journal Article
• Language: English
• Published: 21.12.2014
• Subjects: Computer simulation; Detectors; Energy (nuclear); Flats; Monte Carlo methods; Neutron sources; Polyethylenes; Spectrometers
• ISSN: 0168-9002
• DOI: 10.1016/j.nima.2014.09.035

A new long counter has been developed with a flat energy response over a wide range from 1 keV to 15 MeV. It consists of five super(3)He proportional counter tubes and a number of carefully designed polyethylene moderators. The structure of this detector was determined by careful Monte Carlo simulations. The calculated results show that the efficiency of this counter is uniform from 1 keV neutron energy to 15 MeV. Calibration was performed on an Am-Be source and the accelerator-produced monoenergetic D-D and D-T neutron sources. Fluctuation of the response curve is less than 10% over this energy range.