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18 November 2002 High-position-resolution neutron detector using a position-sensitive photomultiplier tube
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Traditional neutron gas counters show limits when a spatial resolution under 1 millimeter in both directions is required. The detction of the light signal induced by a neutron interaction in solid scintillators allow to achieve a better spatial accuracy, but at the cost of a higher sensitivity to γ-rays which represent the major source of noise in most of the neutron instuments. We have studied at the ILL a detector based on a Position Sensitive Photo-Multiplier Tube directly coupled to a scintillator, either GS20 Lithium glass (0.5mm and 1mm thick) or 6LiF/ZnS:Ag (0.42mm thick). The simplicity of this device is very well suited when the position resolution is the main parameter of choice. These two types of scintillators are compared in term of energy spectrum, detection efficiency for thermal neutrons and for 60Co γ-rays, which, even if not representative of γ environment on experimental sites allow this comparison. The counting rate limit is estimated from the light decay time and, position resolution, linearity and edge effects are discussed. We conclude that the GS20 scintillator give the best results, provided its thickness is properly chosen according to the wavelength of neutrons to be detected.
© (2002) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jean Franco Clergeau, Bruno Guerard, J. C. Buffet, and P. Van Esch "High-position-resolution neutron detector using a position-sensitive photomultiplier tube", Proc. SPIE 4785, Advances in Neutron Scattering Instrumentation, (18 November 2002);


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