HETEROSTRUCTURED ORGANIC SCINTILLATORS WITH A HIGH PULSE-SHAPE DISCRIMINATION CAPABILITY FOR RADIOECOLOGY PROBLEMS

Studies of the relative Light output and optical transmission of organic composite scintillators with different grain sizes were performed. The research results showed that for samples with grains 0.06…0.3 mm in size, in contrast to the samples with larger grains, the relative light output and optical transmission are lower.

Measurement on Light Yield of Liquid Scintillator Based on P-Xylene

The relative light output of liquid scintillator based on p-xylene (PX) was measured in this paper. The setup for testing on light output was clearly displayed. The results showed that the light yield increased as the addition of the second solute p-bis (o-methylatyryl)- benzene (bis-MSB). Bis-MSB moves the maxmun of fluorescence emission spectra of liquid scintillator from 365nm to 425nm, which is the most sensitive region for the PMT, so the possibility of self-absorption and the loss of light output could be reduced to some extent.

La2Hf2O7:Ti4+ ceramic scintillator for x-ray imaging

Transparent ceramic scintillators of La2Hf2O7:Ti4+ were developed by a novel combustion synthesis method. The optical transmittance for a 1.0-mm-thick specimen is about 60% of the incident light, and the x-ray stopping power is also quiet high. The broad emission band centered at 475 nm originates from the oxide-Ti4+ charge-transfer transitions, which renders fast decay time on the order of 10 μs. The highest relative light output has reached about 1.5 times that of Bi4Ge3O12 (BGO) single crystal when excited by 120 kV x-rays.