X-ray image converters utilizing rare earth oxyhalide phosphors

Details X-ray image converters utilizing rare earth oxyhalide phosphors X-ray image converters utilizing rare earth oxyhalide phosphors

1984-04-13

1985-02-12

Cooper, Jack

Stock material or miscellaneous articles

Composite

Of inorganic material

2504831, 2504861, 2503272, 2523014H, 428690, 428913, 430966, 430967, G01J 158, C09K 11475

Patent

active

044991592

ABSTRACT:
Oxyhalides of lanthanum and gadolinium and coactivated with thulium ion and further containing an impurity ion and a second coactivator selected from praseodymium and neodymium, including mixtures thereof, exhibit reduced quantum noise when employed in X-ray image converter devices. In the preferred embodiments, small but effective amounts of ytterbium ion can also be incorporated into the phosphor material to reduce afterglow and a multilayer X-ray screen construction is disclosed employing the improved phosphors.

REFERENCES:
patent: 3795814 (1974-03-01), Rabatin
patent: 3872309 (1975-03-01), De Belder et al.
patent: 3996472 (1976-12-01), Rabatin
patent: 4070583 (1978-01-01), Rabatin

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