12-16 September 2005
University of Liverpool
Europe/Zurich timezone

High-position-resolution neutron imaging detector with crossed wave-length shifting fiber read-out using two ZnS:Ag/6LiF scintillator sheets

Sep 15, 2005, 10:30 AM
University of Liverpool

University of Liverpool

Greenbank Conference Park
Board: P27
Contributed Poster Applications in Nuclear Physics P : Coffee and Poster Session


Dr Masaki Katagiri (Japan Atomic Energy Research Institute)


High-intensity pulsed neutron sources have made a great deal of progress at Japan (J-PARC project), U.S.A. (SNS project), and UK (ISIS-II project). The specifications required for neutron imaging detectors used at these facilities are a high-position resolution, high-detection efficiency, a high counting rate, a high n/ ratio, etc. Especially the detectors which exhibit a high-position resolution and high detection efficiency are required for the crystallography diffractometers. Moreover, it is also essential for these detectors to be compact and to have the least dead-detection area for a large solid-angle coverage. We have developed a compact high-position-resolution neutron-imaging detector with wavelength shifting (WLS) fibers using two scintillator sheets. The two ZnS:Ag/6LiF scintillator sheets are placed in front and back side of the crossed WLS fibers arrays. The luminescent light generated in either scintillator sheet is detected by few WLS fibers surrounding to the incident point of the neutron. The X and Y positions of the incident neutron are measured by the photon counting method or by the double coincidence method. The WLS fibers are bent at right angle at the edges of the scintillator sheets to reduce the dead-detection area of the detector. The developed detector structure ensures compactness and easy assembly of these types of detectors. It was confirmed that the neutron imaging detector using WLS fibers with a size of 0.5 x 0.5 mm exhibited a position resolution of less than 0.8 mm. The detection efficiency for thermal neutrons was improved 55% by two scintillator sheets from 29% by the single sheet.

Primary author

Dr Masaki Katagiri (Japan Atomic Energy Research Institute)

Presentation materials