Fluorescent screen, x-ray detector, and x-ray inspection apparatus
A technology of X-ray and fluorescent plate, which can be used in measurement devices, X-ray/infrared technology, X/γ/cosmic radiation measurement, etc.
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Embodiment 1
[0074] The fluorescent plate in embodiment 1 is to use Gd 2 o 2 S: Phosphor plate made of Pr, Ce phosphor. Gd 2 o 2 S: Pr, Ce phosphor was produced through the following steps. First, praseodymium oxide and cerium oxide were dissolved in nitric acid at a target ratio (99.3:0.7) of Pr and Ce in parts by weight to prepare a mixed solution of both. Next, this solution is reacted with, for example, a predetermined amount of dimethyl oxalate solution to obtain a coprecipitated oxalate of Pr and Ce. This co-precipitated oxalate was calcined in the air at a temperature of 1000° C. or lower for several hours to obtain a mixed oxide of Pr and Ce. In this way, a mixed powder in which Pr and Ce are uniformly dispersed in minute units is obtained.
[0075] Next, as a step of synthesizing the phosphor, with respect to Gd 2 o 2 The amount of Pr added to the S matrix is 0.07% by mass (at the same time, the amount of Ce added is 0.0005% by mass (5ppm)). Salt, alkali metal phosphate...
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