Evaluation of spatial resolution on ZnS:Ag/10BO type scintillation converter for neutron imaging

Yasuda, Ryo; Katagiri, Masaki; Iikura, Hiroshi  ; Sakai, Takuro; Hayashida, Hirotoshi; Sugimoto, Katsumi*; Takenaka, Nobuyuki*; Matsubayashi, Masahito  

Scintillation converter is one of important devices, which determine the spatial resolution in NRG using camera system. We prepared 10BO type with different thickness and evaluated the characteristics including spatial resolution. Those scintillators were tested using cooled type CCD camera system at thermal neutron radiography facility (TNRF) in JRR-3. Spatial resolution of those scintillators was evaluated as "half value" by the edge spread function method using knife-edged Gd plate with 0.1mm in thickness. The results show that the spatial resolution of the10BO type scintillators is improved with thinning the scintillation layer and is not so different from that of LiF type ones. On the other hand, luminescence intensity of the 10BO type scintillators is decreased with thinning the scintillation layer due to the reduction of efficiency of neutron capture and lower than that of LiF type ones.