PREPARATION OF NEW SCINTILLATION IMAGING MATERIAL COMPOSED OF SCINTILLATOR-SILICA FINE POWDERS AND ITS IMAGING OF TRITIUM

摘要

A new scintillation imaging material [scintillator-silica fine powder (FP)] was prepared using silica FPs and scintillator- encapsulating silica nanoparticles (NPs) (scintillator-silica NPs). The wt% values of scintillator-silica NPs on the scintilla- tor-silica FPs were 38, 43, 36 and 44%. Scintillation images of ~3H, ~(63)Ni, ~(35)S, ~(33)P, ~(204)Tl, ~(89)Sr and ~(32)P dropped on the scintil- lator-silica FPs were obtained at about 37 kBq per 0.1-10 µl with a charge-coupled device (CCD) imager for a 5 min exposure. In particular, high-intensity CCD images of ~(35)S were selectively obtained using the 2.25, 4.77 and 10 µm silica FPs with scintillator-silica NPs owing to the residual S of dimethyl sulfoxide in the preparation. Scintillation images of ~3H at 1670 ± 9Bq/0.5µl and 347 ± 6 Bq/0.5µl dropped in a 2 mm hole on the scintillator-silica FPs (6.78 and 10 µm) were also obtained using the CCD imager for a 2 h exposure.