
doi: 10.2172/4425878
Judicious use of scintillation screens greatly improves the capabilities for low-flux neutron imaging. Room temperature, cooled /sup 6/LiF-- ZnS(Ag) and gadolinium oxysulfide (Gd/sub 2/O/sub 2/S: Tb) were evaluated for direct exposures, and x-ray intensifying screens were evaluated with dysprosium and europium transfer screens. Although gadolinium oxysulfide provides improved resolution, it requires seven times the imaging time of /sup 6/LiF-- ZnS(Ag). Studies indicate that use of intensifying screens during transfer processes decreases the flux for a given density by about 30% and provides contrast enhancement. It was shown that cooling of scintillator-film combinations reduces reciprocity failure effects and in these experiments decreased direct exposure times (Gd/sub 2/O/sub 2/S: Tb) by up to 80%. (auth)
*Neutron Radiography-- Image Intensifiers, 570, N42400* --Engineering--Materials Testing, Oxysulfides, *Image Intensifiers-- Performance, Time Dependence Lithium Fluorides-- Silver-- Zinc Sulfides, Gadolinium- - Oxysulfides-- Terbium, Low Temperature
*Neutron Radiography-- Image Intensifiers, 570, N42400* --Engineering--Materials Testing, Oxysulfides, *Image Intensifiers-- Performance, Time Dependence Lithium Fluorides-- Silver-- Zinc Sulfides, Gadolinium- - Oxysulfides-- Terbium, Low Temperature
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