Phosphor which emits light by the excitation of X-ray, and a X-r

Details Phosphor which emits light by the excitation of X-ray, and a X-r Phosphor which emits light by the excitation of X-ray, and a X-r

1992-05-08

1993-10-05

Cooper, Jack

Stock material or miscellaneous articles

Composite

Of inorganic material

2504831, 2523014R, C09K 1178

Patent

active

052503666

ABSTRACT:
The phosphor and the X-rays intensifing screen according to the present inventin emit light by the excitation of X-ray, and they are used for medical and industrial radiography. In addition to the conventional contents of rare earth tantalate and/or rare earth niobate, the phosphor according to the present invention contains a determined quantity of divalent metal. This divalent metal content can make the improvement of the afterglow characteristic and the light emission characteristic of the phosphor. The phosphor according to the present invention is represented by the general formula (I) MyLn.sub.1 -x-(2/3)yDO.sub.4 : xR.sup.3+ (I). In the general formula above, M is at least one divalent metal selected from the group consisting of Be, Mg, Ca, Sr, Ba, Zn and Cd, Ln being at least one selected from the group consisting of Y, Gd, La, and Lu, D being either or both of Ta and Nb, R being at least one selected from the group consisting of Tm, Pr, Sm, Eu, Tb, Dy and Yb or the base substance is self-activating, and y is a value in the range 1.times.10.sup.-5 .ltoreq.y.ltoreq.1, and x is a value in the range 0.ltoreq.y.ltoreq.0.05.

REFERENCES:
patent: 3758486 (1973-09-01), Ropp
patent: 4032471 (1977-06-01), Luckey
patent: 4225653 (1980-09-01), Brixner
patent: 4473513 (1984-09-01), Cusano et al.

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