Isotopically-enriched gadolinium-157 oxysulfide scintillator screens for the high-resolution neutron imaging.

We demonstrate the feasibility of the production of isotopically-enriched gadolinium oxysulfide scintillator screens for the high spatial-resolution neutron imaging. Approximately 10 g of 157 Gd 2 O 2 S:Tb was produced in the form of fine powder (particle size approximately 2 µm). The level of 157 Gd enrichment was above 88%. Approximately 2.5 µm thick 157 Gd 2 O 2 S:Tb scintillator screens were produced and tested for the absorption power and the light output. The results are compared to the reference screens based on nat Gd 2 O 2 S:Tb. The isotopically enriched screens provided increase by a factor of 3.8 and 3.6 for the absorption power and the light output, respectively. The potential of the scintillator screens based on 157 Gd 2 O 2 S phosphor for the purpose of the (high-resolution) neutron imaging is discussed. [ABSTRACT FROM AUTHOR]