Changes in half brightness dose due to preparation pressure for YAG:Ce

Previous research shows that certain properties, such as half brightness dose (N/sub 1/2/) and fluorescence intensity, depend on preparation pressure. Phosphor tablets composed of 50% cellulose and 50% yttrium aluminum garnet doped with cerium (YAG:Ce) powders, were created using a Carver press with an applied force of 78 kN. The average 3-MeV proton N/sub 1/2/ for the tablet samples was 11.6 and 36.6 times smaller than equivalent values for the paint and crystal forms of YAG:Ce, respectively. It is quite apparent that the application of a large preparation force damages some of the YAG:Ce grains which reduces the N/sub 1/2/. The fluorescence efficiency of the tablets was also less than that measured for the other forms of YAG:Ce.