Study of the pulse shape as a means to identify neutrons and gammas in a NE213 detector
Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
This report describes investigations of the NE213-detector and the possibility to utilize pulse shape analysis to separate neutrons and gammas in a mixed emission field. Neutron fluxes are often contaminated with gammas, to which the detectors are sensitive. Sorting out the unwanted gamma pulses from the interesting neutrons is therefore crucial in many situations, for instance in fusion reactor diagnostics, such as for neutron cameras. This can be done based on pulse shapes, which differ for gammas and neutrons interacting in the NE213-detector. By analyzing the pulse shapes from a digital transient recorder, neutrons can be distinguished from gammas. An experiment with a Cf-252 neutron source was set up and provided data. The separation algorithm was based on charge comparison and gave good results. Furthermore the results of the pulse shape analysis were verified by TOF-measurements. The lowest permissible energy for a reasonable separation was found to be around 0.5 MeV. Some conclusions on the limitations of the equipment were also made.
Place, publisher, year, edition, pages
2006. , 42 p.
, Uppsala University Neutron Physics Report, ISSN 1401-6269 ; 06#2
pulse shape discrimination, pulse shape analysis, neutron, liquid scintillator
IdentifiersURN: urn:nbn:se:uu:diva-129312OAI: oai:DiVA.org:uu-129312DiVA: diva2:342845
Master Programme in Engineering Physics
2006-03-16, Å2005, Lägerhyddsvägen 1, Ångströmlaboratoriet, 10:00 (English)
UppsokPhysics, Chemistry, Mathematics
Källne, Jan, Professor